Significant Figures Rounding Calculator

Count significant figures, round to any number of sig figs (from 1 to N), and view results in scientific notation with proper power display.

Significant Figures Rules:

Non-zero digits are always significant (e.g., 123 has 3 sig figs)
Zeros between non-zero digits are significant (e.g., 1005 has 4 sig figs)
Leading zeros are NOT significant (e.g., 0.0025 has 2 sig figs)
Trailing zeros after decimal are significant (e.g., 12.00 has 4 sig figs)
Trailing zeros without decimal may be ambiguous (shown in scientific notation)

Original Number

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— significant figures

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Rounded Results (1 to N significant figures)

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⚡ Step-by-step explanation: Enter a number and select significant figures to see detailed rounding steps.