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Is 20 GB of data enough?
Whether 20 GB is enough depends on what fills your hours. Here is what it covers activity by activity, and the calculator to test your own daily mix against it.
Short answer
20 GB of data is a moderate mobile allowance: on its own it covers about 6 hours of HD streaming, 200 hours of music, or 100 hours of social media in a month. Video is what decides it — an HD hour uses 30× a music hour — so if your month is mostly streaming, divide 20 GB by 3 GB per hour and compare that to your habits. The calculator below does the mixed-use math.
Hours per day, on a typical day:
Your data cap lasts about
3 days
- Daily usage
- 6.6 GB
- A 30-day month needs
- 198 GB
- Cap covers the month?
- No
About the numbers
A cap is spent by your heaviest habit, not your average one. Downgrading stream quality from HD to SD stretches 20 GB about four times further, and shifting big downloads (game installs, cloud backups) to unmetered WiFi protects the allowance for the things that must use it.
What 20 GB of data covers
| Activity | Hours 20 GB covers |
|---|---|
| Web browsing & email | 200 |
| Social media & short video | 100 |
| Music streaming | 200 |
| SD video streaming (480p) | 28 |
| HD video streaming (1080p) | 6 |
| 4K video streaming | 2 |
| HD video calls (Zoom, Meet) | 20 |
| Online gaming (play, not downloads) | 200 |
Hours = cap ÷ the activity's GB per hour, for that single activity alone. Mixed use splits the cap across everything you do.
Data used per hour by activity
| Activity | GB per hour | Per month at 1 h/day |
|---|---|---|
| Web browsing & email | 0.1 GB | 3 GB |
| Social media & short video | 0.2 GB | 6 GB |
| Music streaming | 0.1 GB | 3 GB |
| SD video streaming (480p) | 0.7 GB | 21 GB |
| HD video streaming (1080p) | 3 GB | 90 GB |
| 4K video streaming | 7 GB | 210 GB |
| HD video calls (Zoom, Meet) | 1 GB | 30 GB |
| Online gaming (play, not downloads) | 0.1 GB | 3 GB |
Published service figures (Netflix, YouTube, Zoom) — adaptive streaming means real rates flex with your connection and quality settings.
What common data caps cover
| Data cap | Hours of hd video streaming (1080p) | Hours of music streaming | Hours of social media & short video |
|---|---|---|---|
| 5 GB | 1 | 50 | 25 |
| 10 GB | 3 | 100 | 50 |
| 15 GB | 5 | 150 | 75 |
| 20 GB | 6 | 200 | 100 |
| 30 GB | 10 | 300 | 150 |
| 50 GB | 16 | 500 | 250 |
| 100 GB | 33 | 1,000 | 500 |
| 300 GB | 100 | 3,000 | 1,500 |
Each column assumes the cap is spent on that activity alone: hours = cap ÷ GB per hour. Mixed use splits the cap.
How we calculate this
Straightforward multiplication, with the per-hour rates doing the real work:
- Daily usage. each activity's GB-per-hour rate × your daily hours, summed across everything you do in a typical day.
- Monthly total. daily GB × 30 days — the planning convention ISPs use for a billing month.
- Cap coverage. your cap ÷ daily GB gives the days it lasts; cap ÷ a single activity's rate gives the hours of that activity it covers.
Assumptions
- Per-hour rates are published service figures (Netflix and YouTube quality tiers, Zoom bandwidth) — adaptive streaming varies the real rate with your connection.
- Data amounts use decimal units (1 GB = 1,000 MB), matching how ISPs meter caps.
- Game-install and system-update downloads are one-off transfers on top of the hourly figures — a single 100 GB install outweighs months of online play.
- A billing month is counted as 30 days.
Sources
Last reviewed: July 21, 2026
Frequently asked questions
How much data do I use in a month?+
Multiply each habit's hourly rate by your daily hours, then by 30: HD streaming uses about 3 GB an hour, 4K about 7 GB, SD about 0.7 GB, video calls about 1 GB, music around 0.1 GB, and online gaming only ~0.1 GB. Two hours of HD video a night is already ~180 GB a month, which is why streaming quality — not time online — decides most people's total. The calculator adds your whole mix up for you.
How much data does streaming video use?+
It scales with picture quality: roughly 0.7 GB per hour in SD (480p), up to 3 GB per hour in HD (1080p), and up to 7 GB per hour in 4K. The same show can therefore use ten times more data on a 4K TV than on a phone in data-saver mode. Every major service (Netflix, YouTube, Disney+) has a quality setting that caps this.
Is 100 GB of data enough for a month?+
100 GB covers about 33 hours of HD streaming, or 140+ hours of SD, or 1,000 hours of music — so it is comfortable for phone-first use with moderate video, but tight as a household's only connection. If you run a TV on it, drop the stream quality to SD; if it's a hotspot for work calls and browsing, 100 GB usually lasts the month easily.
Does online gaming use a lot of data?+
Playing uses surprisingly little — around 100 MB (0.1 GB) per hour, so even a 30-hour month of matches is ~3 GB. What empties caps is everything around the game: installs of 50–150 GB, patches of 20+ GB, and cloud gaming, which streams like HD/4K video at gigabytes per hour. On a capped plan, download games on unmetered WiFi and play natively rather than via cloud streaming.
How can I use less data without giving anything up?+
Three settings do most of the work: cap streaming quality (HD instead of 4K cuts video data by more than half; SD cuts it by ~75%), turn on data-saver modes in YouTube, Spotify and your phone's OS, and move game installs, cloud backups and system updates to unmetered WiFi. Autoplaying feeds are the silent extra — disabling video autoplay in social apps trims a habit you never chose.
Why does my phone report different usage than my carrier?+
Carriers meter every byte that crosses their network — including carrier services, tethered devices, and overhead your phone's own counter attributes differently — and their billing cycle rarely lines up with your phone's counting period. Treat the carrier's number as the billable truth, reset your phone's counter to the billing date, and leave a 10–15% margin between your estimate and the cap.
Also try the Data Usage Calculator.