Transfer time

How Long Does It Take to Upload 1 GB at 10 Mbps?

Uploading or downloading a 1 GB file at 10 Mbps takes about 13 minutes 20 seconds, assuming the full speed is sustained.

By the HeftySend team Last updated 8 October 2026 Free, no sign-up

Upload or download time

13 min 20 s

10 Mbps is 1.25 MB/s. 1 GB is 1,000 MB, and 1,000 ÷ 1.25 = 800 seconds.

With 10% protocol overhead: about 14 minutes 40 seconds. Assumes the speed holds for the whole transfer.

Calculate your own

Different file size, a speed in MB/s or Gbps, or the 10% overhead switched on? The calculator opens pre-filled with 1 GB and 10 Mbps; change either value and the answer and both reference tables update.

Open the calculator: 1 GB at 10 Mbps

Works without JavaScript; the result is in the page when it loads.

What 1 GB actually is

A single gigabyte is a few minutes of phone video, a long slide deck with embedded clips, an hour of high-quality audio or a folder of a few hundred JPEGs. It is the first size that is clearly too big for an email attachment or a chat message, which is why "how long will 1 GB take" is asked so often.

At this size the connection is rarely the problem on fibre or good mobile, but on a slow upload link a gigabyte is still long enough to make you wait and watch the progress bar. Compressing already-compressed photos and video gains nothing; sending the file as it is and letting the transfer resume if the connection blips is the sensible approach.

4K video (55 Mbps): about 2 minutes
1080p video (15 Mbps): about 9 minutes
RAW photos (40 MB each): about 25
25 MB email attachments: about 40

What 10 Mbps actually is

10 Mbps is what the upload side of many cable and FTTC/VDSL plans actually delivers, a typical 4G upload indoors, and about the download speed of a good ADSL2+ line. It moves 1.25 MB of file data a second, so a megabyte takes a little under a second and a gigabyte a little over thirteen minutes.

Is 10 Mbps a realistic upload speed? As an upload speed it is realistic, even common: run a speed test on a plan sold as "100 Mbps" cable and 10 Mbps up is a normal result. As a download speed it is slow by today's standards; if that is all you measure, you are on ADSL, a congested mobile cell or Wi-Fi at the edge of its range.

1 GB at other speeds, and other sizes at 10 Mbps

The first table keeps the file at 1 GB and changes the speed; the second keeps the speed at 10 Mbps and changes the file. Rows with their own write-up are linked. Every row is also written out as a sentence under "In words".

1 GB at neighbouring connection speeds
Connection speed	Time for 1 GB
10 Mbps	13 min 20 s
25 Mbps	5 min 20 s
50 Mbps	2 min 40 s
100 Mbps	1 min 20 s
500 Mbps	16 s

In words

1 GB at 10 Mbps takes about 13 minutes 20 seconds.
1 GB at 25 Mbps takes about 5 minutes 20 seconds.
1 GB at 50 Mbps takes about 2 minutes 40 seconds.
1 GB at 100 Mbps takes about 1 minute 20 seconds.
1 GB at 500 Mbps takes about 16 seconds.

Neighbouring file sizes at 10 Mbps
File size	Time at 10 Mbps
1 GB	13 min 20 s
2 GB	26 min 40 s
5 GB	1 h 6 min
10 GB	2 h 13 min
20 GB	4 h 26 min

In words

1 GB at 10 Mbps takes about 13 minutes 20 seconds.
2 GB at 10 Mbps takes about 26 minutes 40 seconds.
5 GB at 10 Mbps takes about 1 hour 6 minutes.
10 GB at 10 Mbps takes about 2 hours 13 minutes.
20 GB at 10 Mbps takes about 4 hours 26 minutes.

Why it usually takes longer than 13 minutes 20 seconds

Protocol overhead

The headline figure assumes every bit of the 10 Mbps carries file data. In practice TCP/IP headers, TLS and HTTP framing take 5–10% of the link, so a more realistic estimate for 1 GB at 10 Mbps is about 14 minutes 40 seconds with 10% overhead, 1 minute 20 seconds longer. Quote that figure when someone is waiting for the file.

Upload is not download

The formula gives the same 13 minutes 20 seconds for an upload and a download, but the speed you should plug in is rarely the same. 10 Mbps is usually the download speed of a plan; on an asymmetric cable, 4G or satellite link the upload side of that plan is often around 1 Mbps, which turns 13 minutes 20 seconds into about 2 hours 13 minutes for the same 1 GB. When you are the one sending, run a speed test and use the upload number.

Dropped connections

Over 13 minutes 20 seconds something can interrupt the transfer: a Wi-Fi roam, a laptop lid, a mobile hand-off between masts. A plain browser upload starts again from zero; a transfer that uploads in parts and resumes from the last confirmed part loses seconds. HeftySend uploads are resumable by default; the single button below takes you to the uploader.

Sending something big? Let it survive a dropped connection.

HeftySend uploads in parts and resumes from the last confirmed part, so a Wi-Fi blip or a sleeping laptop costs seconds, not the whole transfer. No account needed for transfers up to 100 GB.

Send up to 100 GB free

Frequently asked questions

How long does it take to download 1 GB at 10 Mbps?

About 13 minutes 20 seconds, the same as uploading, because the formula is file size divided by speed in both directions. The practical difference is that 10 Mbps is far more likely to be a real download speed than a real upload speed: plans advertise the download figure, and on cable, 4G and satellite the upload side is a fraction of it. If you are downloading 1 GB on a 10 Mbps plan, this estimate is usually close; if you are uploading, measure your upload speed first.

How long does 1 GB take at 10 Mbps with protocol overhead?

About 14 minutes 40 seconds once you allow 10% for TCP/IP headers, TLS and HTTP framing, which is 1 minute 20 seconds longer than the raw 13 minutes 20 seconds. Real transfers lose 5–10% of the link rate to that framing, so the overhead figure is the better one to quote when someone asks when 1 GB will arrive.

What if my connection only manages half of 10 Mbps while sending 1 GB?

Transfer time scales directly with speed: at 5 Mbps the same 1 GB takes about 26 minutes 40 seconds, and at 2.5 Mbps about 53 minutes 20 seconds. Wi-Fi, other devices on the network, a busy receiving server or a laptop on battery can each take a connection well below its headline figure, so a speed test taken right before you send is the only reliable input.

How many megabytes per second is 10 Mbps, and how does that give 13 minutes 20 seconds for 1 GB?

10 Mbps is 1.25 MB/s, because there are 8 bits in a byte. 1 GB is 1,000 MB, and 1,000 ÷ 1.25 = 800 seconds, which is 13 minutes 20 seconds. The calculator uses decimal units (1 GB = 1,000 MB); a file that Windows reports as 1 GB is about 7% larger in decimal terms and takes correspondingly longer.