Estimate the ideal time to transfer a file at a constant connection speed.
Download Time Calculator
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Download Time
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Table of Contents
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What is Download Time?
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How to Use This Calculator
- Enter or select File size, Download speed.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Time = file size in bits/link speed in bits per second
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Variables Explained
| Input | What it means |
|---|---|
| File size | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Download speed | Distance traveled per unit time; choose the unit before using the numerical value. |
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Worked Example
A 100 MB file contains about 800 megabits and takes 80 seconds at 10 Mbps before overhead.
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Why Use This Calculator?
Use the formula and worked example to check the relationship between the input and output before carrying the result into a longer calculation.
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Common Mistakes
- Bytes and bits differ by a factor of eight; actual throughput is usually lower than the advertised link rate.
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Frequently Asked Questions
Should I round numbers before calculating?
Keep the original input precision through the calculation and round the final answer to the precision you need. Rounding an intermediate result can change later steps.
Why can a manual calculation differ slightly?
Check the operation, units, signs and rounding first. Equivalent fractions or expressions can look different while representing the same value.
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Sources & References
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