THE NUMBERS, EXPLAINED
How to use this calculator.
Standard binary STL has an 80-byte header, 4-byte triangle count and 50 bytes per triangle. Metadata occupies the fixed header rather than adding bytes. Nonstandard extensions are excluded.
Start with your inputs
Enter triangles, header metadata bytes used. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Triangles | 1000 |
| Header metadata bytes used | 20 |
A worked example
With the example inputs above, binary stl bytes is 50,084. Change the inputs to explore your own scenario.
Putting the example numbers into the formula
Binary STL bytes
84+50 × (1000) = 50,084
Unused header bytes
80-(20) = 60
Binary STL MiB
(84+50 × (1000)) ÷ 2^20 = 0.047764
| Result | Example answer |
|---|---|
| Binary STL bytes | 50,084 |
| Unused header bytes | 60 |
| Binary STL MiB | 0.047764 |
How this is calculated
Binary STL bytes
84+50 × a
Unused header bytes
80-b
Binary STL MiB
(84+50 × a) ÷ 2^20
Symbols and units
- a
- Triangles
- b
- Header metadata bytes used
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Standard binary STL has an 80-byte header, 4-byte triangle count and 50 bytes per triangle. Metadata occupies the fixed header rather than adding bytes. Nonstandard extensions are excluded.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Binary STL bytes; Unused header bytes; Binary STL MiB. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Standard binary STL has an 80-byte header, 4-byte triangle count and 50 bytes per triangle. Metadata occupies the fixed header rather than adding bytes. Nonstandard extensions are excluded.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
Library of Congress: binary STL format ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →