Significant Figures Calculator

Count significant figures and round to N digits.

Input Parameters

Number

Significant figures to keep

Significant figures4

Rounded value0.00456

E-notation4.56e-3

175 available

Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.

Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.

Visualize compound growth with recurring deposits, annual rate, and investment horizons.

Add or extract Value Added Tax (VAT) with international country presets.

Analyze profitability and percentage return on business capital and investments.

Gross to net salary with income tax, social contributions and deductions, monthly and annual.

Count significant figures of any number and round it to 1–15 significant digits, with exponential form shown.

Which zeros count?

Leading zeros never count; trailing zeros count only after a decimal point.

How is rounding done?

To N significant digits via standard half-up rounding of the normalized mantissa.

Scientific notation input?

Yes — mantissas like 1.50e3 keep their written precision.