DEVELOPER PLANNING · VERSION 1.0.0

Base64 Size Estimator

Calculate Base64 character count and padding for a binary byte length.

Instant calculationCompare five scenariosJSON + CSV exports

Your inputs

Calculation results

Formula & assumptions

Base64 length = 4 × ceiling(bytes/3); no line breaks or data-URL prefix included.

Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.

Compare your scenarios

Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.

Using Base64 Size Estimator

Calculate Base64 character count and padding for a binary byte length.

Enter binary size using the units printed under each field.
Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.

Example

Binary size: 1000 bytes
Base64 characters: 1336
Padding characters: 2
Extra characters over bytes: 336

Questions & answers

What does Base64 Size Estimator calculate?

Calculate Base64 character count and padding for a binary byte length.

Which units should I enter?

Binary size uses bytes. Convert values to these units before calculating.

Which formula does it use?

Base64 length = 4 × ceiling(bytes/3); no line breaks or data-URL prefix included.

What does the included example show?

Binary size: 1000 bytes. Result: Base64 characters = 1336; Padding characters = 2; Extra characters over bytes = 336.

Can I compare different settings?

Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.

Can I export the calculation?

Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.