Upload is the rate at which data leaves your home. Compare the stated upload speed separately: full fibre does not automatically mean symmetrical speeds. A higher upload tier can cut transfer waits even when your download experience already feels fast.
Once you know the speed you need, use our London broadband overview to compare local coverage and networks.
Recognise outgoing activity
Sending a file to a colleague, synchronising a new folder and transmitting your camera during a meeting all use upload capacity. Several ordinary tasks can overlap without being obvious, especially when backup software works in the background.
List the outgoing jobs you care about and when they run. If a large overnight backup is acceptable, scheduling may be enough. If a client needs the file immediately, the transfer time becomes part of the working day.
Read the two directions separately
Symmetrical means the package specifies matching upload and download rates. An asymmetrical package allocates different rates. The service description should tell you which you are buying; the fibre technology alone does not settle it.
Ask for the actual upload figure when comparing quotes. A change from one very large download headline to another may be less useful than a meaningful improvement in outgoing capacity.
Calculate a realistic starting point
For a decimal 10 GB file, the ideal calculation is 80,000 megabits divided by upload Mbps. At 20 Mbps it gives 4,000 seconds, or 66 minutes 40 seconds. At 100 Mbps it gives 13 minutes 20 seconds. At 500 Mbps it gives 2 minutes 40 seconds.
These are lower-bound calculations at a constant data rate. Encryption, overhead, a busy household, remote storage limits and the application's behaviour can all extend the actual time. Use the result to compare scale rather than predict an exact completion time.
| Upload rate | Ideal time for a decimal 10 GB file |
|---|---|
| 20 Mbps | 66 minutes 40 seconds |
| 50 Mbps | 26 minutes 40 seconds |
| 100 Mbps | 13 minutes 20 seconds |
| 500 Mbps | 2 minutes 40 seconds |
| 1,000 Mbps | 1 minute 20 seconds |
Leave room for live activity
A bulk upload can consume capacity that a call also needs. If a meeting becomes unstable while a backup is running, pause the backup as a diagnostic check. Then decide whether scheduling, an application limit or more capacity is the sensible fix.
Avoid choosing a package from a single file-transfer result alone. Observe a normal busy period and check whether the delay matters to the household. A connection can be perfectly adequate most of the day yet need a better plan for those overlapping moments.
Check the destination too
The server receiving a file has its own limits. If only one storage service is slow, compare another permitted destination or ask its support team before blaming the line. Work VPNs and security tools can also influence throughput.
Test using the real work process after an upgrade. A faster speed-test upload is encouraging, but the useful outcome is shorter transfers or steadier calls in the services you actually use.
Choose according to urgency and frequency
Someone who sends a large project every afternoon may value upload highly. Someone who mainly watches video and lets a phone back up overnight may not need the same tier. The correct choice is tied to time saved and disruption avoided.
Keep both directions visible in the final comparison, along with the total contract cost. This makes a package's practical balance clearer than its download headline alone.
Your questions, answered.
Does FTTP always have equal download and upload?
No. Some full-fibre packages are symmetrical and others are not. Check the specific package's stated speeds.
Are MB/s and Mbps the same?
No. A byte contains eight bits. Ignoring overhead, 100 Mbps corresponds to 12.5 megabytes per second; applications may also use different decimal or binary size units.
Sources & further reading
Official information behind this guide. Links checked 29 October 2026; individual datasets retain their stated reference dates.