Data-usage calculator

Project a typical daily data figure to weekly and 30-day totals, or turn a monthly plan allowance into a daily budget — a rough comparison tool, not a personalised plan recommendation.

Typical daily usage (GB)

Result

Estimated monthly usage

Estimated weekly usage

How to use this tool

To project usage: enter your typical daily data use from your phone or router's usage stats.
To budget: switch direction and enter your plan's monthly allowance to see how much you can use per day and per week.
Compare the two: if your daily use is above the daily budget, you'll likely run out before the month ends.

Assumptions

Assumes consistent daily usage — actual usage often varies significantly day to day (e.g. streaming video some days, light browsing others).

Technical details: what the fields mean

Typical daily usage dailyUsageGb: Typical data used in a day, from your device or router's usage stats.

Methodology

Weekly usage = daily usage × 7. Monthly usage = daily usage × 30, a fixed 30-day projection rather than a calendar-month calculation; it assumes a consistent daily pattern.

Worked example

1.5GB/day

Inputs: Typical daily usage: 1.5 GB

Result: 10.5 GB/week, 45.0 GB/month

Light use, 0.5 GB/day

Inputs: Typical daily usage: 0.5 GB

Result: 15.0 GB a month — inside a 20 GB plan with a little headroom.

Budget: a 30 GB monthly plan

Inputs: Monthly allowance: 30 GB

Result: 1.00 GB a day, 7.0 GB a week. At the 1.5 GB/day habit above you'd run out around day 20.

Budget: a 100 GB plan

Inputs: Monthly allowance: 100 GB

Result: 3.33 GB a day.

Practical guidance

Check your device's built-in data usage tracker over a full week for a more representative daily average than a single day's figure.
Video streaming and hotspot use usually dominate mobile data; lowering streaming quality on mobile data has the biggest effect.
Automatic app updates and photo backups can be restricted to Wi-Fi in your phone's settings.

Common mistakes

Basing the estimate on one unusually high or low usage day rather than a representative average.

FAQs

How much mobile data do I use a month?

Multiply your typical daily usage by 30 for a rough monthly estimate — this calculator does that directly.

How much data can I use per day on a 30GB plan?

About 1 GB a day, or 7 GB a week, if spread evenly over 30 days.

Last reviewed: 2026-10-11

A simple 7-day and 30-day projection from one daily figure, not a personalized plan recommendation. Real usage varies day to day, so check your device's history over a longer period for a more representative average.

This tool provides an indicative estimate, based on the assumptions stated above.

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