Everyday utilities beta

File Transfer Calculator

Calculate transfer time, file size, or required speed.

Calculated locally in your browser

What would you like to calculate?

Transfer timeFile sizeSpeed needed

File size

Use the total size for a batch of files.

Transfer speed

Use upload or download speed, as appropriate.

Overhead allowance 10%

Connection overhead (%)

The share of connection capacity unavailable for your files. Use 0% for an ideal estimate or an already measured effective speed.

Estimate

Estimated transfer time

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Enable JavaScript for live estimates.

Real-world speeds vary. This is a planning estimate, not a speed test.

How it works

Formula: Transfer time = file size in bits ÷ effective speed in bits per second. The same relationship is rearranged when solving for file size or required speed.
Units: Bytes use a capital B and bits use a lowercase b. Decimal units use powers of 1,000; binary units such as GiB and MiB use powers of 1,024.
Overhead: The overhead setting reduces the connection speed used in the estimate. Set it to 0% when you already know the effective file-transfer speed.
Estimate limits: This is not a speed test. Wi-Fi conditions, competing traffic, server limits, storage performance and many small files can make a real transfer slower.