Download time calculator

Estimate transfer time = file size in megabits ÷ effective megabits per second.

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Download time calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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File size (decimal MB)

Link speed (Mbps)

More inputs and assumptions

Achievable share of link speed (%)

Answer

…

Estimate transfer time = file size in megabits ÷ effective megabits per second.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

MB uses 1,000,000 bytes and Mbps uses 1,000,000 bits/second; a byte has 8 bits. Efficiency is your assumption. Excludes latency, startup, changing throughput and protocol-specific behavior.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

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Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

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Updated 2026-09-26

Using Download time calculator

Estimate transfer time = file size in megabits ÷ effective megabits per second.

MB uses 1,000,000 bytes and Mbps uses 1,000,000 bits/second; a byte has 8 bits. Efficiency is your assumption. Excludes latency, startup, changing throughput and protocol-specific behavior.

Next: Bandwidth calculator

A worked example

Example inputs: file size (decimal mb) = 1000, link speed (mbps) = 100, achievable share of link speed (%) = 80. Transfer time (seconds) = 100.

Before you use the result

MB uses 1,000,000 bytes and Mbps uses 1,000,000 bits/second; a byte has 8 bits. Efficiency is your assumption. Excludes latency, startup, changing throughput and protocol-specific behavior.

Example results for file size (decimal mb)

These examples use Link speed (Mbps): 100; Achievable share of link speed (%): 80. They are reference calculations, not recommended settings.

File size (decimal MB)	Transfer time (seconds)
500	50
1000	100
2000	200

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ToolOctopus. “Download time calculator.” Updated 2026-09-26. https://tooloctopus.com/download-time-calculator.

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