🔢 Sig Fig Calculator

Type it exactly as written – trailing zeros matter. Scientific notation like 6.02e23 or 6.02 × 10^23 works too.
Optional

Significant figures in 0.004050

4

4 significant figures

0.004050

Underlined bold digits are significant; faded zeros are placeholders.

Scientific notation
4.050 × 10⁻³
Decimal places
6
Rounded to 2 s.f.
0.0041
In scientific notation
4.1 × 10⁻³

Step by step

  1. 2 non-zero digits – always significant
  2. 1 zero between non-zero digits – significant
  3. 1 trailing zero after the decimal point – significant
  4. 3 leading zeros – never significant (they only place the decimal point)
  5. Total: 4 significant figures
  6. To round to 2: keep the first 2 significant digits, look at the next digit (5) – 5 or more, so round up
  7. Result: 0.0041

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