calc.engineer / General & Math / Sig Figs

Sig Figs v1.0.0

Count significant figures in a number and optionally round to N significant figures. Accepts the number as a string to preserve trailing zeros (e.g. '1.200' has 4 sig figs). Applies standard sig fig rules: leading zeros do not count, trailing zeros after a decimal point count, trailing zeros before a decimal point are treated as significant. Also returns the number in scientific notation. Essential for laboratory measurements, error analysis, and maintaining proper precision in chained calculations.

feeds scientific_notation →
The number as a string to preserve trailing zeros (e.g. '1.200')
Optionally round the number to this many significant figures
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/sig_figs \
  -H "Content-Type: application/json" \
  -d '{"number_str": …, "round_to_n": …}'

MCP: connect to https://calc.engineer/mcp and call sig_figs.

calc.engineer — free, MCP-native engineering tools.