Count written precision
Check values such as 0.00450, 100, and 100. to see which digits count and when trailing zeros are ambiguous.
Sig fig calculator
Sig Fig Calculator
Sig fig is the common shorthand for significant figures. Use this calculator to count, round, or calculate sig figs without losing the rule explanation.
Step-by-step explanation
Step 1
Find the first non-zero digit. Leading zeros before that digit are not significant.
Step 2
Count the significant digits: 4, 5, 0.
Step 3
0.00450 has 3 significant figures.
Lab Report Answer
0.00450 has 3 significant figures based on the written digits and zero rules.
What this sig fig calculator covers
This page uses the common shorthand sig fig while keeping the full significant figures rules visible. It is useful when you need the answer and the reason in the same place.
Round to a target count
Enter a value and target number of sig figs to get the rounded result plus the rounding step that changed the final digit.
Calculate with rules
Use addition, subtraction, multiplication, or division and see whether decimal-place or fewest-sig-fig precision controls the answer.
When to use this shorthand page
Homework and quick checks
Use it when your assignment says sig fig calculator, sig figs, or significant figures. The rules and output are the same.
Lab report wording
Copy the lab-report-ready sentence when you need to explain why a result was rounded a certain way.