Data Cap Calculator
See how much of your monthly data cap you have used and how much is left based on your plan and daily usage, free in your browser.
Enter Values
How to use this calculator
- Enter your monthly cap and daily usage.
- Press Calculate.
How it works
Divides your cap by your daily usage to show how many days it lasts, plus a safe daily allowance over 30 days.
Worked example
100 GB cap, 5 GB/day. lasts 20 days.
Common mistakes
- Forgetting background and multi-device usage when budgeting a shared cap.
- Assuming usage is even; a few HD-streaming evenings can blow a monthly cap quickly.
Frequently asked questions
How long will my data cap last?
Divide your cap by your daily usage. A 200 GB cap at about 6.5 GB/day lasts the month; heavy 4K streaming can use that in days.
What happens when I hit the cap?
Depending on the plan you may be throttled to a slower speed or charged for excess data, so the tool helps you pace usage across the month.
What happens if I exceed my data cap?
It depends on the plan — providers may throttle your speed, charge for excess data, or both. The safe daily allowance shown helps you avoid it.
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Cite this tool
Zerdly. (2026). Data Cap Calculator. Retrieved from https://www.zerdly.com/tools/data-cap-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.