How do I count significant figures in 0.00450?

Leading zeros do not count. 0.00450 has 3 significant figures: 4, 5 and the trailing 0 after the decimal point.

Are trailing zeros significant?

Trailing zeros are significant if a decimal point is present. If an integer has trailing zeros but no decimal point, they are ambiguous unless explicitly indicated.

Do I need to log in to use this tool?

No — this is a fully static, client-side tool that runs in your browser, requires no login or API.

Mini ChatGPT for Significant Figures

SigFig Tutor — Mini ChatGPT for Significant Figures

Instant, conversational answers. Paste a number or expression and get a clear count, rounded value, and short lesson.

What are Significant Figures?

Significant figures show the precision of a measurement. Use the tool above to see which digits count and why. Below are a few rules:

Leading zeros (e.g. 0.0025) do not count.
Trailing zeros are counted if there is a decimal point (e.g. 2.300 has 4 sig figs).
For integers without a decimal point, trailing zeros are ambiguous unless specified.
Scientific notation (1.230e3) clearly shows sig figs: mantissa determines the count.

Examples:

0.00450 → 3 sig figs

1200 → ambiguous (often treated as 2 significant figures unless a decimal is shown)

3.450e2 → 4 sig figs

Suggest 0 Τ𝗈 100 Tech & tools dally updates