Significant Figures Calculator

Count significant figures, round to a chosen precision, and calculate using sig-fig rules with the reasoning shown.

SIGNIFICANT FIGURES

LOCAL NO DATA SENT

SIGNIFICANT FIGURES BENCHCOUNT / ROUND / CALCULATE

INPUTCOUNT OR APPLY SIGNIFICANT-FIGURE RULES

MODE VALUE A

Type trailing decimal zeros exactly as written. For example, 100 and 100. communicate different precision under common classroom conventions.

RESULT — Enter a value and choose what you want to do.

SIG FIGS A—

SIG FIGS B—

RULE USED—

SCIENTIFIC FORM—

HOW IT WORKSWHICH DIGITS COUNT — AND WHY

READYCount, round, multiply, divide, add, or subtract using significant-figure rules.

LOCAL TOOL: Values are processed entirely in your browser. Classroom conventions can differ for ambiguous trailing zeros in whole numbers, so the tool calls that ambiguity out instead of pretending it does not exist.

FIELD NOTE / 060

Significant figures describe measured precision, not just the size of a number.

Leading zeros are placeholders, zeros between significant digits count, and trailing zeros after a decimal point normally count. Multiplication and division are limited by the fewest significant figures; addition and subtraction are limited by the least precise decimal place.

Significant figures describe measured precision, not just the size of a number.

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