Upload Speed Test

Upload is the half that gets forgotten

Most home connections are asymmetric: far more download than upload. That arrangement made sense when people mostly consumed, and it stopped making sense the moment video calls became normal. Upload is what carries your camera, your voice and your screen share.

So when a call is fine for you and stuttering for everyone else, upload is usually the reason — and it is the figure people rarely check.

What you need

• 1–2 Mbps — a single video call at standard quality
• 3–4 Mbps — HD video calling
• 5–10 Mbps — calling while something else uploads, or screen sharing at high quality
• 10 Mbps and up — streaming, large backups, or several people working from the same connection

A connection advertised as 100/10 has ten megabits of upload, which sounds generous until a cloud backup takes all of it.

How this measurement works, and its limits

The page sends two megabytes to this server and times how long it takes to be accepted. That is a real measurement of how fast your device can push data out.

But this site is static, with no application behind it to receive uploads. The server may refuse the request outright, in which case the tool says so rather than inventing a number. Where it does work, treat the figure as approximate: it includes connection setup, and a static host may close the connection before the whole body is sent.

For a figure you can rely on, a dedicated speed-test service with servers built for the purpose will be more accurate. This is a useful sanity check rather than a definitive one.

How to use it

1. Stop anything that uploads — cloud sync, backups, any call in progress.
2. Press start and wait.
3. Compare against what your plan promises. Upload is usually a tenth of download on consumer connections.
4. If it reads as unavailable, the server declined the upload. That is a limitation of this page, not of your connection.

Common uses and tips

Getting a reading worth trusting

• Close everything else first. A cloud backup or a video call will share the line and halve the figure.
• Use a cable if you can. If wired is fast and wireless is slow, the problem is your Wi-Fi rather than your connection.
• Run it several times. Networks vary minute to minute, and one reading tells you very little.
• Test at different times. Evening congestion is real and is the commonest cause of "it's only slow sometimes".

Why your speed never matches what you pay for

• Protocol overhead takes roughly 5–10 % before anything else.
• Wi-Fi is shared and lossy. A 500 Mbps line routinely delivers 200 over wireless, and much less through walls.
• Old hardware. A router or network card from the 100 Mbps era caps everything behind it, regardless of the line.
• The advertised figure is usually a maximum rather than a guarantee.

Megabits and megabytes

Connections are sold in megabits per second and downloads are shown in megabytes per second. Eight bits make a byte, so a 100 Mbps line downloads at about 12.5 MB/s at best. Both figures are shown above so the difference is visible.

Questions people ask

Why is my upload so much slower than download?

Most consumer connections are deliberately asymmetric, often ten to one. Cable and DSL are the worst for this; fibre is usually more balanced.

How much upload do I need for video calls?

About 1–2 Mbps for standard quality and 3–4 for HD. More if several people share the connection.

The test says upload is not measurable.

This site is static and has no application to receive an upload, so the server declined the request. That is a limit of this page rather than your connection.

Why might this be less accurate than a dedicated speed test?

Because those run servers built to receive test uploads. Here the measurement includes connection setup and depends on how the static host handles the request.

My calls stutter for others but look fine to me.

That is the classic sign of an upload problem. Your download is carrying their video fine; your upload is not carrying yours.