# How long does it take to upload 100 GB?

Upload time depends almost only on your upload speed. Here is 100 GB on 4G, 5G and home broadband from 10 Mbps to 1 Gbps, and how the numbers are worked out.

_Source: https://sharelargefilesfree.com/how-long-to-upload-100gb · Updated 2026-10-13_

**Quick answer:** Uploading 100 GB (819,200 megabits) takes about 28 h 27 min at 10 Mbps, 5 h 41 min at 50 Mbps, 2 h 51 min at 100 Mbps and 17 min at 1 Gbps, allowing 80% of the line speed for real-world overhead. The formula: size in megabits ÷ upload speed in Mbps. At this size, send it as a download link rather than through email or chat apps.

## Upload time for 100 GB by connection

| Connection | Upload speed | Best case | Realistic (80% of the speed) |
| --- | --- | --- | --- |
| 4G / LTE mobile (typical; often 5 to 20 Mbps) | 10 Mbps | 22 h 45 min | **28 h 27 min** |
| 5G mobile (good signal; often 20 to 100 Mbps) | 50 Mbps | 4 h 33 min | **5 h 41 min** |
| Home broadband (basic cable or DSL upload) | 10 Mbps | 22 h 45 min | **28 h 27 min** |
| Home broadband (common cable upload) | 20 Mbps | 11 h 23 min | **14 h 13 min** |
| Home broadband | 50 Mbps | 4 h 33 min | **5 h 41 min** |
| Fibre (entry-level fibre) | 100 Mbps | 2 h 17 min | **2 h 51 min** |
| Fibre | 500 Mbps | 27 min | **34 min** |
| Fibre (symmetric gigabit) | 1000 Mbps | 14 min | **17 min** |

Mobile rows use typical upload speeds; yours can be far higher or lower depending on signal, network and time of day. Broadband rows use the upload speed of the plan, which is usually much lower than the download speed on cable and DSL.

## How the time is worked out

**Time in seconds = file size in megabits ÷ upload speed in megabits per second.**

For 100 GB: 100 × 1,024 MB = 102,400 MB; × 8 bits per byte = 819,200 megabits. At 20 Mbps that is 819,200 ÷ 20 = 40,960 seconds, or about 11 h 23 min. Real uploads rarely hold the full speed (Wi-Fi, protocol overhead, other devices), so at 80% it is about 14 h 13 min.

Watch the units: speeds are in mega_bits_ (Mbps), file sizes in mega_bytes_ (MB), and 1 byte = 8 bits. A "20 Mbps" connection moves at most 2.5 MB per second. We count 1 GB as 1,024 MB; Macs and phones count 1,000 MB and Windows about 1,074 million bytes, a difference of under 5%.

## What 100 GB of video looks like

| Video | Bitrate | Length in 100 GB |
| --- | --- | --- |
| iPhone 1080p 30 fps (HEVC) | 8 Mbps | about 28 h 27 min |
| iPhone 4K 30 fps (HEVC) | 22.7 Mbps | about 10 h 1 min |
| iPhone 4K 60 fps (HEVC) | 53.3 Mbps | about 4 h 16 min |
| Apple ProRes 422 HQ, 4K UHD 29.97 | 707 Mbps | about 19 min |

Worked out from the bitrates on our [video file size](https://sharelargefilesfree.com/4k-video-file-size) pages. So a 100 GB upload is typically a long phone video, a shoot's worth of RAW photos or a project folder.

## Which apps accept a 100 GB file

Can you send a single file of this size (about 100 GB) as an attachment?

| App | Limit | Fits? |
| --- | --- | --- |
| Gmail | 25 MB per email | No, send a link |
| Outlook.com | 20 to 25 MB per email | No, send a link |
| WhatsApp (document) | 2 GB per file | No, send a link |
| Telegram | 2 GB per file | No, send a link |
| Facebook Messenger | 100 MB per file | No, send a link |
| Discord (free) | 20 MB per file | No, send a link |
| Slack | 1 GB per file | No, send a link |
| WeTransfer (free) | 3 GB per transfer | No, send a link |
| **Share Large Video Files** | 20 GB per transfer | Send the link anywhere |

Limits from our [file size limits by app](https://sharelargefilesfree.com/file-size-limits-by-app) table, checked against each service's help pages.

## Tips for uploading 100 GB

- Plug the computer into the router with a cable if you can. Wi-Fi through walls often halves the real upload speed.
- Stop other uploads while it runs: cloud photo backup, OneDrive or Dropbox sync and video calls all share the same upload bandwidth.
- Stop the computer from sleeping during the upload (Windows power settings; on a Mac, System Settings > Energy or Battery) and keep the browser tab open.
- Start it before you leave the computer for a few hours, or overnight, and check the upload speed with a speed test first so you know how long to expect.
- Do not zip video or photos just to make them smaller: they are already compressed, so a ZIP saves almost nothing. Zip only to keep a folder together.
- If a single transfer is over the 20 GB limit, split the folder into several transfers, or use the split file tool and join the parts after download.
- Send the recipient the checksum (the file hash checker makes one) so they can confirm a very large file arrived intact.
- Uploading once and sending a link is faster for several recipients than attaching the file to several messages: the file is uploaded one time only.

## Frequently asked questions

### How long does 100 GB take to upload on 4G?

About 28 h 27 min at a typical 10 Mbps 4G upload speed, and about 56 h 53 min if the signal only gives 5 Mbps. On 5G at 50 Mbps it is about 5 h 41 min.

### How long does 100 GB take on 100 Mbps?

About 2 h 17 min at the full 100 Mbps upload speed and about 2 h 51 min in practice. Check that 100 Mbps is your upload speed, not only the download speed.

### Why is my upload slower than my internet speed?

Most cable and DSL plans advertise the download speed; the upload speed is often 5 to 20 times lower. Wi-Fi, other devices on the network and the distance to the server reduce it further. Run a speed test and look at the upload figure.

### Is Mbps the same as MB per second?

No. Mbps is megabits per second; 8 bits make a byte, so 100 Mbps is at most 12.5 MB per second. That is why 100 GB takes about 2 h 17 min at 100 Mbps, not 17 min.

### Can I upload 100 GB for free?

Share Large Video Files takes up to 20 GB per transfer, free and without an account. If your files are larger, split them into several transfers or zip them into parts.