Find out how many significant figures a number has, with every digit colour-coded and the rule that applies, round to any number of sig figs, or do arithmetic with the correct rounding rules for lab work.
significant not significant ambiguous
Runs entirely in your browser. Nothing is uploaded to any server.
Colour-coded digits show exactly which ones count and why.
Numbers are rounded as text, so 2.675 never turns into 2.67 by accident.
Applies the right rule for addition versus multiplication.
All non-zero digits are significant. Zeros between them are significant. Leading zeros, such as those in 0.0045, only place the decimal point and are not significant. Trailing zeros are significant when there is a decimal point (2.50 has three) but ambiguous in a whole number without one (2500 could have two, three or four).
When multiplying or dividing, the answer has as many significant figures as the least precise input. When adding or subtracting, it is the number of decimal places that matters: round the answer to the last decimal position that both numbers know.
Four significant figures: 4, 0, 5 and the final 0.
Two significant figures versus four.
Four significant figures, from the coefficient only.
Yes if the number has a decimal point, such as 3.400. In whole numbers like 3400 they are ambiguous, so this calculator does not count them unless you write 3400. or use scientific notation.
Skip the leading zeros, keep the first two significant digits 4 and 5, look at the next digit 6, round up: 0.00046.
When you add, the uncertainty comes from the least precise decimal position, not from the number of digits. 12.11 + 0.3 is only known to the tenths place.
No. Counted values and defined constants, like 12 eggs or 100 cm in a metre, have unlimited significant figures and do not limit the answer.
With the common round-half-up rule on the exact digits you typed: a following digit of 5 or more rounds up.
More free tools from My Panda Toolbox.