Streaming Data Calculator (GB per hour, will my data last?)
See how much data an hour of each thing uses, then add what you do each day and find out whether your allowance makes it to the end of the month.
How much does an hour use?
Typical data per hour for common things people do on a phone, tablet or TV. Longer bar, more data.
Will my data last the month?
How big is one film or episode?
How it works
The ladder at the top shows typical data per hour for each activity, worked out from a typical bitrate: GB per hour = Mbps × 0.45 (3,600 seconds, 8 bits per byte, 1 GB = 1,000 MB as mobile networks count).
In the planner, set your monthly allowance and add what you do: an activity, the hours a day, and how many days a week. Each row shows its monthly total, and the verdict says whether you make it to the end of the month.
The calendar fills each day with the data you'd have left. Days go amber when under 15% remains; the day you run out is marked, and the days after it are greyed. The biggest easy saving finds the one activity where dropping a quality step (1080p to 720p, very high to high music) saves the most.
The figures are typical, rounded values, not measurements of a particular app; real use depends on the programme, the app and its settings. For reference, Netflix publishes up to 0.3 GB/h on Low, 0.7 GB/h on Medium and up to 3 GB/h HD and 7 GB/h 4K on High; Spotify lists 96, 160 and 320 kbps music settings.
Background: how much data streaming uses per hour, why video starts blurry, and the interactive lesson be the video player. Nothing you type leaves your browser; the share link keeps your plan in the address bar only.
Need the same maths from a script, a phone-plan comparison or a travel planner? Anvil's free streaming data API returns GB per hour, the monthly verdict, the run-out day and the easiest saving as JSON, with no key.
Questions
How much data does an hour of HD video use?
About 1.4 GB at 720p and 2 to 3 GB at 1080p. 4K uses up to about 7 GB an hour.
How long will 15 GB of mobile data last?
About 6 to 7 hours of Full HD video, 20 hours of 480p, or more than 100 hours of 96 kbps music, if that's all you do.
Why does my data run out so fast?
Usually autoplaying HD video in feeds, apps choosing high quality on a strong signal, and background backups. Setting video apps to a lower mobile quality often halves the use.
Is anything uploaded?
No. It's plain JavaScript in your browser. The share link stores your plan after the # in the address, which is never sent to the server.