Sig Fig Subtraction Calculator

When you subtract two nearly equal numbers, the leading significant digits cancel out, leaving fewer meaningful digits. For example, 23.456 - 23.441 = 0.015, which has only 2 sig figs despite both inputs having 5.

Yes, subtraction and addition use the identical rule: round the result to the same decimal place as the input with the fewest decimal places.

It is when subtracting two nearly equal numbers causes a dramatic loss of significant figures. Scientists try to avoid experimental designs that rely on small differences between large measurements for this reason.

Use instruments with more decimal places, redesign the experiment to measure the difference directly rather than subtracting two large measurements, or use algebraic rearrangements that avoid subtracting similar values.

Yes. The rule applies regardless of whether the result is positive or negative. The decimal place of each input still determines the precision of the answer.

Yes, embedding the Sig Fig Subtraction Calculator is free. Hit the "Embed" button on this page, adjust the width, height, and theme, then grab the iframe code. It works on WordPress, Wix, Squarespace, Shopify, and plain HTML pages. No registration needed. Full instructions at calculory.com/services/embed-calculators.