Back to Sig Fig Calculator
New SEO tool
Scientific Notation Converter with Significant Figures
Convert decimals into scientific notation, choose the exact number of significant figures, and see the matching e-notation for calculators, chemistry homework, and lab reports.
123000
1.23 x 10^5
0.00450
4.50 x 10^-3
9876
9.9 x 10^3
Convert Decimal and Scientific Notation
Enter a regular number or e-notation value, choose the significant figures, and get a clear scientific notation result.
Decimal
123000
3 sig figs detected in the input
Scientific notation
1.23 x 105
E-notation: 1.23e+5
Use it for calculator e-notation
Switch between 1.23 x 10^5 and 1.23e+5 without losing the significant figure count.
Chemistry-friendly precision
Trailing zeros in the coefficient stay visible, so 1.00e+3 clearly has three sig figs.
Built for long-tail examples
Use the examples hub to check common questions like 100, 0.00450, and rounding to 2 sig figs.
Scientific notation and sig fig rules
Only the coefficient determines the significant figures.
The exponent changes scale, not precision.
Trailing zeros in a decimal coefficient are significant.
Scientific notation removes ambiguity from large rounded numbers.