Data Usage Calculator
Estimate your monthly data usage in GB from browsing, streaming and downloads free in your browser with this simple data usage calculator.
Enter Values
How to use this calculator
- Enter your daily data use.
- Press Calculate.
How it works
Scales your daily data use to a week, month and year so you can compare it against a plan's allowance.
Worked example
2 GB a day. ≈ 61 GB a month.
Common mistakes
- Underestimating background usage — updates, backups and syncing add up over a month.
- Using standard-definition figures for HD or 4K streaming, which use far more data.
Frequently asked questions
How is monthly data usage estimated?
It multiplies each activity's data rate by how long you do it, then totals them, so you can size a plan before you commit.
What uses the most data?
Video streaming dominates — HD is roughly 3 GB/hour and 4K can exceed 7 GB/hour — followed by large downloads and cloud backups.
How is the monthly figure worked out?
It averages 30.4 days (365 ÷ 12) so monthly and yearly estimates line up. Your billing cycle's exact length may differ slightly.
Related tools
- Data Cap Calculator
- Streaming Data Calculator
- Download Time Calculator
- Mbps to MB/s Calculator
- Upload Time Calculator
- Bandwidth Calculator
Explore more in Networking, IT & Sysadmin.
Cite this tool
Zerdly. (2026). Data Usage Calculator. Retrieved from https://www.zerdly.com/tools/data-usage-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.