How much data does a teenager actually use?
The honest answer: more than most parents expect. Ofcom data shows that UK mobile data usage doubles roughly every three years — and teenagers are the heaviest users.
Here's a rough monthly breakdown by activity type:
| Activity | Per hour | 1 hr/day = monthly |
|---|---|---|
| Social media (TikTok, Instagram) | ~1GB | ~30GB |
| YouTube (HD) | ~1.5GB | ~45GB |
| Streaming (Netflix, Disney+) | ~1–3GB | ~30–90GB |
| Gaming (online) | ~600MB | ~18GB |
| Music (Spotify) | ~460MB | ~14GB |
| Browsing | ~1GB | ~30GB |
| Video calls | ~1.2GB | ~36GB |
A teenager who uses TikTok for 1 hour and watches YouTube for 1 hour per day would use over 75GB per month on mobile data alone — before gaming or streaming.
Is unlimited data worth it for kids?
For most families with active teenagers, yes. Here's why:
- No bill shock. Capped plans charge for every MB over your allowance. One heavy month can cost significantly more than expected.
- Usage grows over time. Kids who start on 10GB nearly always exceed it within a year as they discover new apps and streaming habits.
- Future-proof. Video quality, app sizes, and online gaming all consume more data each year.
- Simpler for parents. No monitoring usage, no panicked top-ups, no mid-month arguments about data.
What's the cheapest unlimited SIM for kids in the UK?
Chattr's unlimited 5G SIM starts at £20/month with loyalty pricing that drops automatically the longer you stay:
- Months 1–6: £20/month
- Months 7–11: £18/month
- Month 12+: £15/month
No contract, no credit check, no bill shock. Just a simple unlimited plan that gets cheaper over time.
Frequently asked questions
The average teenager uses between 5GB and 20GB per month, but heavy streamers and social media users can easily exceed 50GB. The calculator above gives you a personalised estimate.
10GB may be enough for very light users, but most teenagers exceed this once you factor in YouTube, TikTok, and online gaming. If they stream even one hour of video per day on mobile, they'll likely exceed 10GB.
YouTube uses approximately 1.5GB per hour in HD (720p) and up to 7GB per hour in 4K. An hour of HD YouTube per day equals around 45GB per month.
No. Data used over Wi-Fi does not come out of your mobile data allowance. The calculator above estimates mobile data only — usage at home on Wi-Fi is separate.