File Size Calculator

Estimate media file size from bitrate and duration. Enter your own values below to see estimated file size and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

File size (decimal MB) = total bitrate (Mbps) × duration (seconds) ÷ 8.

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What is File Size Calculator?

File Size Calculator helps you estimate media file size from bitrate and duration.

The main result is estimated file size. The formula, example and assumptions below explain how to interpret it.

How to use File Size Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather total bitrate (Mbps) and duration (seconds). Use values from the same situation or reporting period.
  2. Replace the example total bitrate with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read estimated file size. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter total bitrate in Mbps, at least 0. Decimals are accepted.
  • Enter duration in seconds, at least 0. Decimals are accepted.

File Size Calculator: a worked example

With the inputs below, the result is 300 MB (estimated file size). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Total bitrate (Mbps)8 Mbps
Duration (seconds)300 seconds
Estimated file size300 MB

Understanding the File Size result

The main output is estimated file size, expressed in MB. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

File Size Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending.

For wider guidance, visit Google Ads Help. The formula and scope of this specific tool are stated on this page.

File Size Calculator FAQs

What does File Size Calculator calculate?

File Size Calculator helps you estimate media file size from bitrate and duration. Its main output is estimated file size in MB.

What inputs do I need for File Size Calculator?

You need total bitrate (Mbps) and duration (seconds). Use the field labels and units to match your figures to the formula.

Which formula does File Size Calculator use?

File size (decimal MB) = total bitrate (Mbps) × duration (seconds) ÷ 8.

What is a worked example for File Size Calculator?

Example inputs: Total bitrate: 8 Mbps; Duration: 300 seconds. The result is 300 MB (estimated file size).

How should I enter total bitrate?

Enter total bitrate in Mbps, at least 0. Decimals are accepted.

How do I choose duration?

Enter duration in seconds, at least 0. Decimals are accepted. The example uses 300 seconds; replace it if your circumstances differ.

How should I read estimated file size?

The main output is estimated file size, expressed in MB. It applies to the inputs and operation you selected.

Why might my File Size Calculator result differ from my records?

Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in File Size Calculator?

Yes. Note your first estimated file size, change total bitrate or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is File Size Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.