Technology & Computing
Base64 Encoding Size Overhead Calculator
Calculate the encoded output size and storage overhead when converting binary data to Base64 text.
Your inputs
Change any value to update the result instantly.
Encoded size
4,000 bytes
Overhead
33.3333%
Padding characters
0 =
Extra bytes added
1,000
Base64 always expands data by roughly 33% because 3 raw bytes become 4 ASCII characters.
Formula and working
Encoded bytes = ceil(inputBytes ÷ 3) × 4; Overhead % = (encoded ÷ input − 1) × 100
- 1
Collect the inputs
Input data size (bytes) = 3,000
- 2
Apply the formula
Encoded bytes = ceil(inputBytes ÷ 3) × 4; Overhead % = (encoded ÷ input − 1) × 100
- 3
Result
Encoded size = 4,000 bytes
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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