ASCII Size Calculator
Calculate the size of ASCII text and the storage it occupies.
About ASCII Size Calculator
ASCII stores one byte per character, so size equals character count plus line ending overhead. Windows line endings double that overhead against Unix ones. Line ending overhead is invisible but on a file with many short lines can account for several per cent of total size.
Formula
ASCII Size
Size = characters + lines × line ending bytes
- line ending
- One byte on Unix, two on Windows
- seven-bit packing
- ASCII needs only seven bits, so eight-bit storage wastes one bit
Worked example
With the default values below, ASCII Size Calculator returns Total Size of 5,240. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Number of charactersminimum 0
- 5,000
- Number of linesminimum 0
- 120
- Bytes per line endingaccepts 0–2 bytes
- 2 bytes
Results
- Total Size
- 5,240 bytes
- Total Size
- 5.1172 KB
- Line Ending Overhead
- 240 bytes
- Size if Packed to Seven Bits
- 4,585.0 bytes
- Average Characters per Line
- 41.67
Step by step
- 1Values used
- 2ASCII Size
- 3Total Size= 5,240 bytes
- 4Total Size= 5.1172 KB
- 5Line Ending Overhead= 240 bytes
- 6Size if Packed to Seven Bits= 4,585.0 bytes
- 7Average Characters per Line= 41.67
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is ASCII Size calculated?
Size = characters + lines × line ending bytes ASCII stores one byte per character, so size equals character count plus line ending overhead. Windows line endings double that overhead against Unix ones.
Why does ASCII Size matter?
Line ending overhead is invisible but on a file with many short lines can account for several per cent of total size.
What values do I need to enter?
This calculator takes 3 inputs: Number of characters, Number of lines, Bytes per line ending. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.