Do trailing zeros always count?

Trailing zeros count as significant only when the number contains a decimal point; in a whole number like 100 without a decimal, they're ambiguous.

Significant Figures Counter

Determine how many significant figures a number has, following standard scientific rules for leading, trailing, and captive zeros.

Inputs

Results

Significant Figures: 4
Explanation: Leading zeros are not significant; all digits from the first non-zero digit onward are.

Try an example

Formula

Leading zeros don't count; trailing zeros count only if a decimal point is present

Specific Heat and Significant Figures: Two Foundational Science Skills

The specific heat formula and the rules for counting significant figures, explained with worked examples.

Specific Heat Calculator

Calculate the heat energy needed to change a substance's temperature.

Density Calculator

Calculate density from mass and volume.

Speed, Distance & Time Calculator

Calculate speed from distance and time traveled.

pH Calculator

Calculate pH from hydrogen ion concentration.

Half-Life Calculator

Calculate remaining quantity of a substance after radioactive or exponential decay.

Wavelength & Frequency Calculator

Calculate the frequency of a wave from its wavelength, or vice versa.