UPDATED FOR 2025

Significant Figures Master

The all-in-one precision suite: Count, Calculate, Round, and Convert with scientific accuracy.

Enter a number to analyze its precision instantly.

Disclaimer: This tool is designed for educational and professional estimation purposes. While we strive for 100% adherence to standard sig fig rules (e.g., multiplication limiting by least sig figs), specialized edge cases in advanced physics may vary. Always verify critical data manually.

Cheat Sheet (2025)

  • Non-zerosAll non-zero numbers are significant. (345 → 3)
  • Sandwich ZerosZeros between non-zeros are significant. (305 → 3)
  • Leading ZerosZeros before the first non-zero are NOT significant. (0.002 → 1)
  • Trailing ZerosOnly significant if there is a decimal point. (100 → 1 vs 100. → 3)

Why Accuracy Matters in 2025

In modern scientific fields like nanotechnology and quantum computing, precision isn't just a rule—it's a requirement. This tool ensures your data reporting adheres to the strict standards required by peer-reviewed journals and engineering schematics.

Learn more about error propagation