Skip to content
Kordu Tools Kordu Tools

Download Time Calculator

Runs in browser

Calculate how long a file download takes — enter file size and connection speed, get an instant estimate.

Last updated 02 Apr 2026

Calculate exactly how long a file download will take by entering the file size and your connection speed. Supports bytes through terabytes for file size and Kbps through Gbps for speed. Quick presets cover dial-up (56 Kbps) through gigabit fibre (1 Gbps) for instant comparison. All calculations run locally in your browser — nothing is uploaded or transmitted.

Estimated download time

1m 20s

Transfer details

File size1.00 GB
Connection speed100.0 Mbps
Throughput12.50 MB/s
Loading rating…

How to use

  1. 1

    Enter the file size

    Type the size of the file you want to download and select the unit — KB, MB, GB, or TB.

  2. 2

    Set your connection speed

    Enter your internet speed in Kbps, Mbps, or Gbps. Use the quick presets to select a common speed tier instantly.

  3. 3

    Read the estimated time

    The result shows how long the download will take, formatted as days, hours, minutes, and seconds as needed.

  4. 4

    Compare speed tiers

    Switch between speed presets to compare download times across different ISP packages — useful when choosing a broadband plan.

Frequently asked questions

Why does my actual download take longer?
This calculator shows the theoretical maximum. Real downloads are slower due to TCP/IP overhead (typically 5–10%), server-side throttling, Wi-Fi interference, and the fact that ISPs advertise peak rather than sustained speeds.
What is the difference between Mbps and MB/s?
Mbps (megabits per second) is how ISPs advertise speeds. MB/s (megabytes per second) is how download managers show rates. There are 8 bits in a byte, so 100 Mbps equals approximately 12.5 MB/s.
How do I find my actual download speed?
Run a speed test at fast.com or speedtest.net to measure your real-world speed, then enter that value for a more accurate estimate.
How long does it take to download 1 GB?
On a 100 Mbps connection: about 80 seconds. On 500 Mbps: about 16 seconds. On gigabit (1 Gbps): under 9 seconds. On 10 Mbps DSL: about 800 seconds (13 minutes).
Does the calculator account for network overhead?
No — the result is the theoretical minimum. Real transfers are typically 5–15% slower. Multiply the result by 1.1–1.15 for a realistic estimate.
What is broadband speed according to the FCC?
The FCC defines broadband as 25 Mbps download / 3 Mbps upload as of its older standard, recently updated to 100 Mbps / 20 Mbps for new deployments.
How long does a game download take?
A 50 GB game on 100 Mbps takes approximately 67 minutes. On 500 Mbps: about 13 minutes. On 1 Gbps: about 7 minutes. Use the calculator with your exact game size for a precise estimate.
Can I calculate upload time too?
Yes. Enter your upload speed (usually much lower than download speed — check your speed test results) as the connection speed to estimate upload time for the same file size.

Estimate download time instantly. Enter your file size in any unit — KB,

MB, GB, or TB — and your connection speed in Kbps, Mbps, or Gbps. Quick

presets cover the most common speeds: dial-up (56 Kbps), DSL (10 Mbps),

cable (100 Mbps), fast fibre (500 Mbps), and gigabit (1 Gbps). Results

show elapsed time formatted as days, hours, minutes, and seconds — plus

the effective throughput in MB/s.

All maths run client-side — nothing is transmitted. Results are theoretical

maximums; real-world speeds are typically 5–15% lower due to protocol

overhead, server throttling, and network congestion.

Who is this for: anyone estimating how long a software download, game

install, or large file transfer will take. IT teams planning data migrations,

developers benchmarking upload limits, and anyone comparing ISP tiers before

signing a contract.

Related tools

What Is My IP

Find your public IPv4 and IPv6 address with ISP, city, country, ASN, and timezone — loads instantly.

Subnet Calculator

Calculate network address, broadcast, host range, subnet mask, and wildcard from CIDR notation instantly.

SSL Certificate Checker

Check SSL/TLS certificate validity, issuer, expiry, and SANs for any domain via Certificate Transparency logs.