Free tool · Travel · live now

How much travel data do you actually need?

Trip length × hours online × how you use your phone. The estimator computes it and recommends a plan size — no more overbuying gigabytes you never use.

What this tool does

The Data Usage Estimator answers the trip-planning question that wastes the most money: which plan size? It multiplies your trip days by your daily hours online by a per-hour rate for your usage profile — Light (maps, messaging, email · 150 MB/h), Moderate (social, video calls · 400 MB/h) or Heavy (HD streaming, hotspot · 1000 MB/h) — then adds a 20% buffer and maps the total to a suggested plan size (1 GB → 3 GB → 5 GB → 10 GB → 20 GB+).

The same arithmetic powers the esimgomobile ChatGPT app tool. It's deterministic: the same inputs always give the same answer, and the profile table is published below so you can see exactly what the numbers assume.

How it works
  1. 1
    Enter trip length and daily hours online.
  2. 2
    Pick your usage profile — be honest about the streaming.
  3. 3
    Get your estimate with a 20% buffer and a recommended plan size bucket.
Real parameters

The actual inputs this tool takes.

Same schema as the tool in the esimgomobile ChatGPT app — no hidden fields, no surprises.

ParameterTypeRequiredWhat it means
daysnumberYesTrip length in days (positive).
hours_per_daynumberYesHours online per day (positive).
usage_profileenum: light | moderate | heavyYesLight = maps/messaging/email; Moderate = social/video calls; Heavy = HD streaming/hotspot.
Honest capability note

Arithmetic on your inputs against a fixed, published profile table — no external data, nothing stored. Profiles are averages: a 4K-streaming binge or cloud photo backup can blow past Heavy. When in doubt, round up one plan size — topping up abroad is more expensive than buying right the first time.

Also useful

Related tools.

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Roaming Cost Calculator

Compare your home carrier's roaming day-pass against an illustrative travel-eSIM rate and see the potential savings before you fly.

Roaming Cost Calculator
Questions, answered

Before you ask.

How accurate is the estimate?
It's a planning estimate built on per-hour averages (150/400/1000 MB). Real usage varies with video quality, background sync and hotspot sharing. The 20% buffer absorbs normal variance — unusual spikes (OS updates, cloud backups) don't count as normal.
What eats the most data?
Video streaming, by far — an hour of HD is ~1 GB. Next: video calls, hotspot tethering, cloud photo/video backup and app/OS updates. Maps, messaging and email barely register.
Should I buy bigger than the recommendation?
If you're between sizes or plan to hotspot a laptop, round up one size. Running dry mid-trip costs more in top-ups and hassle than the difference. Our Data-Saver Setup guide stretches any plan further.
Does the estimator send my data anywhere?
No. Everything computes in your browser from the numbers you type. Nothing is stored or transmitted.
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Developers

Every tool is also an API. REST, SDKs, CLI and an MCP server for AI agents.

Developer docs
Plans available

Ready for your trip?

Compare data plans, destinations and prices.

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The experience

See Data Usage Estimator in action.

Every screen below is the real flow: plans, coverage, speed and support, rendered for this page.

esimgomobile.com
API quickstart
curl https://api.esimgomobile.com/v1/esims \
  -H "Authorization: Bearer $KEY" \
  -d '{"country":"DA"}'
200 OK · 59 ms
Developers: drive Data Usage Estimator's data over the REST API — 200 OK in milliseconds.
  1. 1The dashboard keeps every eSIM, every trip, in one place.
  2. 2Rows show data left, days left and current city at a glance.
My eSIM
77%50 GB left
Days left20
Top up+10 GB
Usage dashboard — 77% remaining: the meter Data Usage Estimator helps you size.
  1. 1Illustrative speed readout: sample carrier, city and latency figures.
  2. 2The meter demonstrates the readout — figures are examples, not live measurements.
Data Usage Estimator · 5G
Signal widget — 5G: the connection Data Usage Estimator assumes.
  1. 1Usage ring compresses the whole plan into one glanceable number.
  2. 2Percent remaining is the only metric most travelers check.
Data Usage Estimator · coverage
5 carriers · automatic selection
Coverage map — the 195-destination network Data Usage Estimator checks against.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
woman using laptop at a cafe
Your travel number is waiting.
Get your eSIM
Live now · plans available
“Your travel number is waiting.” — the CTA card on Data Usage Estimator: plans live now, plans available.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
vs roaming
esimgomobile eSIMone price
Carrier roamingper-day fees
10 GB · 14 days · Data Usage Estimator
Why Data Usage Estimator exists: one prepaid price versus per-day roaming fees.
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
Speed test
338Mbps
5G · Data Usage Estimator · 31 ms
338 Mbps measured — the kind of figure Data Usage Estimator factors into its answer.
  1. 1Live usage ring: see remaining data at a glance, no mental math.
  2. 2Top-up button sits right where you need it when data runs low.
Support
How does Data Usage Estimator work?
Enter your trip details and get an instant answer — no account needed.
Support on Data Usage Estimator: how it works, answered with no account needed.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
Recent speeds
Singapore861 Mbps
Bali205 Mbps
Barcelona717 Mbps
Recent speeds for Data Usage Estimator — Singapore, Bali, Barcelona: illustrative 5G figures, not live measurements.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
esimgomobile.com
Plans for Data Usage Estimator
Atlas 5GB5 GB · 30 days
Atlas 20GB20 GB · 30 days
Atlas 50GB50 GB · 60 days
Compare plans
Plan picker — compare the plans Data Usage Estimator can recommend, side by side.
  1. 1The dashboard keeps every eSIM, every trip, in one place.
  2. 2Rows show data left, days left and current city at a glance.
Network
5G
Data Usage Estimator connected
Signal widget — 5G, full bars: the connection Data Usage Estimator assumes you have.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
Tele Agent
“Setting up your Data Usage Estimator line…”
Voice mode — talk through Data Usage Estimator's answer instead of reading it.
  1. 1Illustrative speed readout: sample carrier, city and latency figures.
  2. 2The meter demonstrates the readout — figures are examples, not live measurements.
airplane wing seen through window
Get connected
1 Pick a plan2 Scan QR3 Land online
Three steps with Data Usage Estimator: ask, get the answer, act on it.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
Install
1 Scan2 Add3 Go
Install flow — scan the QR Data Usage Estimator points to, online in two minutes.
  1. 1Live usage ring: see remaining data at a glance, no mental math.
  2. 2Top-up button sits right where you need it when data runs low.
Coverage
195
destinations live
Data Usage Estimator5G ready
Check coverage
The coverage screen behind Data Usage Estimator: 195 destinations, fastest partner chosen automatically.
  1. 1The plan card shows exactly what you're buying — data, days, destination.
  2. 2One tap starts the two-minute QR install.
Launch facts
195destinations live
31free tools
$8entry monthly plan
Launch facts behind Data Usage Estimator — 195 destinations live, 31 free tools, $8 entry monthly plan: numbers we publish and stand behind.
  1. 1Coverage pins show where partner networks are live.
  2. 2The map answers the only question that matters: will it work there?
Language
EnglishDeutschFrançais
Language picker on Data Usage Estimator — English, Deutsch, Français: the app speaks six languages.
  1. 1Signal widget: network generation and destination, always visible.
  2. 2Five bars, zero ambiguity about what you're connected to.
Virtual number
+1 205 811 0725
Routes toData Usage Estimator
SMS + voiceEnabled
Second line on demand: +1 205 811 0725 — Data Usage Estimator for calls, not just data.
  1. 1The roaming math, made visible: one price versus per-day carrier fees.
  2. 2This is the comparison most travelers never see until the bill.
eSIM installedYour Data Usage Estimator plan is ready.
Push · just now
“eSIM installed” — the notification after Data Usage Estimator's recommendation.
  1. 1A real traveler quote, tied to the destination it mentions.
  2. 2Reviews reference actual trips, not generic praise.
31
free tools
launch fact
Launch fact behind Data Usage Estimator: 31 free tools — a fixed figure, not live telemetry.
  1. 1Coverage status at a glance: data live, number available, 5G ready.
  2. 2Green means go — no guessing about what's supported.
man video calling using a laptop while sitting on a chair — Data Usage Estimator works for anonymous visitors — answers first, signup never forced.
Data Usage Estimator works for anonymous visitors — answers first, signup never forced.
teenagers running towards sea — Data Usage Estimator: built for the airport sprinter and the careful planner alike.
Data Usage Estimator: built for the airport sprinter and the careful planner alike.
a man standing on a mountain — The spec grid shows exactly what Data Usage Estimator accepts and what it returns.
The spec grid shows exactly what Data Usage Estimator accepts and what it returns.
stunning new york city skyline at night — The capability matrix lists everything Data Usage Estimator does — no asterisks.
The capability matrix lists everything Data Usage Estimator does — no asterisks.
corner facade of a building in a city — Data Usage Estimator remembers, so repeat travelers barely type.
Data Usage Estimator remembers, so repeat travelers barely type.
bustling night street scene in tokyo japan — Data Usage Estimator runs in your browser session — nothing sensitive stored against you.
Data Usage Estimator runs in your browser session — nothing sensitive stored against you.
man drinking coffee while working on his laptop — The FAQ below Data Usage Estimator answers the six questions everyone asks first.
The FAQ below Data Usage Estimator answers the six questions everyone asks first.
aerial view from airplane over barren landscape — Data Usage Estimator: tell it about the trip, get the answer in under a minute.
Data Usage Estimator: tell it about the trip, get the answer in under a minute.
men with backpacks walking on the beach — Every run of Data Usage Estimator is free — no credits, no paywall, no expiring trial.
Every run of Data Usage Estimator is free — no credits, no paywall, no expiring trial.
Oskar Gross — No account, no install, no waiting — Data Usage Estimator loads and answers.
No account, no install, no waiting — Data Usage Estimator loads and answers.
Anthony Borshon Gomes — Data Usage Estimator: answers first, never a signup wall.
Data Usage Estimator: answers first, never a signup wall.
Denis Linine — From question to next step: Data Usage Estimator shortens the path to a decision.
From question to next step: Data Usage Estimator shortens the path to a decision.
man holding a mobile phone in the dark — Data Usage Estimator accepts your trip details and hands back a clear recommendation.
Data Usage Estimator accepts your trip details and hands back a clear recommendation.
a man looking at mountains — Data Usage Estimator: one question, answered well, instead of ten open tabs.
Data Usage Estimator: one question, answered well, instead of ten open tabs.
man working on computer at outdoor cafe — Data Usage Estimator: the fastest way to turn a vague travel question into a next step.
Data Usage Estimator: the fastest way to turn a vague travel question into a next step.
photo of people holding papers — Data Usage Estimator computes the moment you submit — no queues, no waiting room.
Data Usage Estimator computes the moment you submit — no queues, no waiting room.
quiet tokyo night street scene with people — Data Usage Estimator links every answer onward — usually the plan it recommends.
Data Usage Estimator links every answer onward — usually the plan it recommends.
people brainstorming at the office — From Data Usage Estimator's answer to checkout is a short, well-lit path.
From Data Usage Estimator's answer to checkout is a short, well-lit path.
eiffel tower — The pattern is honest: input, math, answer — the same on every tool.
The pattern is honest: input, math, answer — the same on every tool.
white concrete buildings near the sea — Inputs are validated as you type — mistakes get caught before they become wrong answers.
Inputs are validated as you type — mistakes get caught before they become wrong answers.

Explainer

How Data Usage Estimator works

  1. Open the tool
    • No account needed — Data Usage Estimator runs right in your browser.
    • Everything happens on the page; nothing to install.
  2. Enter your details
    • Answer the few questions the tool asks — trip, destination, dates.
    • The tool validates as you type so mistakes get caught early.
  3. Get your answer
    • Results appear instantly, computed from your inputs.
    • Every result links onward to the next step — usually a plan or checkout.

The pattern is always the same: tell the tool a little about your trip, and it does the research you'd otherwise do across ten tabs.

Tools are free and instant. They're the fastest way to turn a vague travel question into a concrete next step.

Explainer

When to use Data Usage Estimator

  • After the trip: to review what you used and plan smarter next time.
  • At the airport: for last-minute answers when plans change.
  • While planning: before you book anything, so connectivity is priced into the trip.
  • Mid-trip: when you need to top up, switch plans, or check what's next.

Bookmark it — travel questions have a habit of returning at the worst moment.

Most travelers use Data Usage Estimator once while planning and once on the road. Both visits take under a minute.

Explainer

Tips for best results

  • Hotspot sparingly: one laptop tethered all day can burn through a week of phone data.
  • Set a data alert at 80% so a top-up never surprises you mid-trip.
  • Turn off auto-play on social apps before you fly; it quietly eats roaming data.
  • Save your eSIM QR code somewhere safe (email it to yourself) in case you switch phones mid-trip.
  • Screenshot your hotel address and booking confirmations — you'll want them with no signal.
  • Keep your home SIM active for two-factor codes from your bank; run data on the eSIM line.

If a result surprises you, rerun with different inputs. Exploring the options is the point.

The tool is only as good as its inputs — a rough date range beats a perfect one you never enter.

Explainer

What happens next

And if you'd rather talk it through, the Tele Agent answers the same questions conversationally, any time.

From here the path is short — pick a plan, check out through Amazon Pay, scan the QR code, and you're done.

Every tool result points somewhere useful: usually a plan that fits, sometimes a guide that goes deeper.

Feature availability

Every capability of Data Usage Estimator, listed

The complete availability matrix — what Data Usage Estimator does, what it accepts, and what you can count on. No asterisks.

CapabilityStatusWhat it means for you
Free to useIncludedEvery run of the tool is free. No credits, no paywall, no trial that expires mid-trip.
Instant resultsIncludedComputation happens the moment you submit. No queues, no waiting room.
Remembers last inputsIncludedYour most recent entries are kept so reruns take seconds, not minutes.
Private by designIncludedYour inputs are processed in your browser session; nothing sensitive is stored against you.
No account requiredIncludedThe tool works for anonymous visitors — answers first, signup never forced.
Onward linksIncludedEvery result links to the natural next step — the plan, guide or checkout it points to.
Works on any deviceIncludedPhone, tablet or desktop — the tool adapts to the screen in your hand.
Shareable answersIncludedSend the result to travel companions so everyone plans from the same numbers.

Specifications

Data Usage Estimator: inputs and outputs

What you provide

Your trip detailsValidated as you type · optional unless marked

What you get back

A clear answerComputed from your inputs — a number, a plan, or a yes/no
Next-step linksStraight to the plan, setting or guide the answer points to
Plain-language explanationWhy this answer, in words — not just a number on screen
Shareable resultSend it to companions so everyone plans from the same page

Capabilities

What Data Usage Estimator is built to do well

Validated inputs

Mistakes get caught before they become wrong answers — ranges, formats and required fields are checked live.

Trip-aware math

Results account for trip length, destination and usage profile instead of giving one-size-fits-all numbers.

Companion to the Tele Agent

Prefer conversation? The Tele Agent answers the same questions in chat, with the same data behind it.

Rerun friendly

Change one input and see the answer update — exploring options is the whole point.

Plain-language output

No telecom jargon in the results. If a term needs explaining, the tool explains it inline.

Works offline-ish

Once loaded, the tool keeps working through flaky airport Wi-Fi for the inputs you've already entered.

Use cases

Who reaches for Data Usage Estimator

The airport sprinter

Flight delayed, plans changed? Get the answer in under a minute at the gate.

The family organizer

One tool covering every traveler's needs — run it once per person, compare, done.

The repeat traveler

Saved inputs make the second, third and tenth run nearly instant.

The planner

Run the numbers weeks ahead — know the right plan before you book anything.

The remote worker

Size data for video calls and hotspotting with confidence, not guesswork.

The budget hawk

See exactly what each option costs before a cent moves — prepaid means no surprises.

FAQ

Questions about Data Usage Estimator

Is my data shared?

Your inputs stay in your browser session. We don't sell tool usage data, and there's no ad tracker watching the form.

Can I use it on my phone?

Yes — every tool is built mobile-first, because that's where travel questions happen.

How accurate are the answers?

They're computed from your inputs against current plan and coverage data. Garbage in, garbage out — so the tool validates inputs as you type.

Do I need an account?

No — tools work for anonymous visitors. If you do have an account, your last inputs are remembered.

Does the tool cost anything?

No. Every tool on esimgomobile is free to use, as many times as you like.

What happens after I get an answer?

Each result links onward: usually the plan it recommends, sometimes a deeper guide.

See the math

Data Usage Estimator, visualized.

Data Usage Estimator — capability dashboard

What the tool accepts, what it does best, and what it points to.

1
inputs accepted
validated as you type
$0
cost per run
free, unlimited
<1s
answer time
computed instantly
0
account needed
anonymous friendly
Input 1: Trip details — accepted and validated by the toolTrip details 1 input
Instant results: computed the moment you submitInstant results no signupMobile friendly: built for the phone in your handMobile friendly any screenAlways current: reflects live plans and coverageAlways current live dataPrivate by design: inputs stay in your browser sessionPrivate by design in-browserShares well: send the answer to travel companionsShares well send results
Atlas 5GB: 5 GB over 30 days — the plans this tool can recommendAtlas 5GB 5 GBAtlas 20GB: 20 GB over 30 days — the plans this tool can recommendAtlas 20GB 20 GBAtlas 50GB: 50 GB over 60 days — the plans this tool can recommendAtlas 50GB 50 GBAtlas Unlimited: Unlimited over 30 days — the plans this tool can recommendAtlas Unlimited Unlimited
Illustrative — Q1: 35% of maxIllustrative — Q2: 52% of maxIllustrative — Q3: 68% of maxIllustrative — Q4: 85% of maxQ1Q2Q3Q4IllustrativeIllustrative adoption curve — travelers who plan connected earlier each trip.

Hover any bar or point for its exact value. Tabs switch datasets — everything on this panel is computed from live product data unless labeled illustrative.

Data Usage Estimator — capability dashboard. Every input Data Usage Estimator accepts, its capability profile, and the plans it can recommend — hover for detail.
Pro tipsFour habits of the always-connectedPro tipsSmall habits, big difference.1Screenshot bookingsHotel address & confirmations, available with no signal.2Check unlock statusCarrier-locked phones can't add an eSIM — verify first.3Keep home SIM for 2FABank codes still arrive while data runs on the eSIM.4Install before you flyAirport Wi-Fi is the worst place to set up connectivity.
Pro tips. The small things that separate smooth trips from stressful ones.
Get connected in three stepsFrom purchase to online in about two minutesGet connected in three stepsNo store visit, no plastic SIM, no waiting for the post.1Scan the QR codeThe eSIM installs straight onto your phone. No store, no plastic SIM.2Land connectedSwitch the line on when you arrive — online before baggage claim.3Pick your planChoose data for your trip — checkout takes about two minutes.
Three-step setup. Install days before departure or minutes before boarding — your call.
How Data Usage Estimator worksFour steps from question to answerHow this tool worksBuilt to answer one question well.1Enter your detailsTrip, data needs, destination. The tool does the math.2Apply itJump straight to the plan, setting or page it points to.3Get the answerClear result with next steps — save it or act on it.4Open the toolNo account needed — it loads instantly in your browser.
Tool walkthrough. Four steps from landing on Data Usage Estimator to having your answer.
Before / afterThe old way versus the tool wayBefore / afterWhat changes when the tool does the work.BEFORE
Tab-hopping between carrier pages, decoding footnotes.
AFTER
One screen: the answer, with next steps attached.
Before and after. Most travelers never go back to the old way.
Every plan includesNo tiers of basic dignity — these ship with all plansEvery plan includesThe baseline is generous on purpose.24/7 supportReal humans plus the Tele Agent, around the clock.6 languagesThe app speaks your language, wherever you're from.One-tap top-upMore data in seconds — no new QR code.5G where availableFastest local partner network, selected automatically.Keep your WhatsAppYour existing number keeps working on the data line.Hotspot includedShare with your laptop or tablet at no extra cost.
Included with every plan. From 5 GB to Unlimited, the inclusions don't shrink.
Data Usage Estimator: capability profileWhat the tool is good at — illustrative profileCapability profileFive strengths, ranked by what users feel first.Instant resultsno waiting, no signupMobile friendlyworks on the phone in your handShares wellsend the answer to travel companionsAlways currentreflects live plans and coveragePrivate by designyour inputs stay in your browserIllustrative profile based on tool design — not measured telemetry.
Capability profile. Ranked by what travelers notice first, not by marketing priority.
Questions, answeredThe six things everyone asks firstQuestions, answeredShort answers, no sales pitch.Is it a contract?
No — prepaid. Service simply stops instead of charging extra.
Which phones work?
Any carrier-unlocked, eSIM-capable iPhone or Android.
What if data runs out?
80% alert, then one-tap top-up. No bill shock.
Do I keep my number?
Yes — WhatsApp & iMessage keep working on your existing number.
Does hotspot work?
Yes — share your connection with laptop or tablet.
How fast is setup?
About two minutes: plan, QR scan, done.
FAQ at a glance. Short answers, no sales pitch — the questions first, always.
Who it's forFour travelers, one toolWho it's forBuilt for real trip shapes, not personas.1The family organizer
One tool, every traveler's needs covered.
esimgomobile network data2The planner
Compare before you commit — know the right plan weeks ahead.
esimgomobile network data3The last-minute flyer
Answer in minutes, eSIM installed before boarding.
esimgomobile network data4The remote worker
Size data for video calls and hotspotting with confidence.
esimgomobile network data
Use cases. If you recognize yourself here, the tool will pay for its click.
Network at a glanceCoverage facts, network-wideNetwork at a glanceThe numbers that matter before you buy.195destinations liveesimgomobile network data5Gwhere available, auto-selectedesimgomobile network data6app languagesesimgomobile network data2 mintypical install timeesimgomobile network dataPlus: local numbers where available, hotspot included, 24/7 support.Prepaid only — when the plan ends, it simply stops. No contracts.
Coverage facts. Every destination connects to the fastest available local partner network automatically.
Data Usage Estimator: input → outputWhat goes in, what comes outAnatomy of the answerThree inputs in, three useful things out.Your trip detailsDestination, dates, data habits.Your deviceeSIM compatibility checked automatically.Your budgetPrepaid only — the math stays honest.A clear recommendationPlan, size and timing spelled out.Next-step linksStraight to checkout or the relevant guide.No account requiredAnswers first, signup never forced.YOU PROVIDEYOU GET→
Input-output anatomy. Nothing leaves your browser that doesn't need to.

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