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Kordu Tools
Network & IP Runs in browser Updated 02 Apr 2026

Download Time Calculator

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

Estimated download time

1m 20s

Transfer details

File size1.00 GB
Connection speed100.0 Mbps
Throughput12.50 MB/s
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How to use Download Time Calculator

  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. 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. Read the estimated time

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

  4. Compare speed tiers

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

Download Time Calculator FAQ

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.

Background

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.

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