What this tool does
It helps users count, round, and calculate significant figures while showing the rule behind each answer.
Designed for lab work
The calculator keeps the written value visible so students can understand which digits count and why.
About
About Significant Figures Calculator
This site is built as a free educational tool for students, teachers, and lab report writers.
Use the calculatorWhat this tool does not do
It does not store user inputs, replace course instructions, or claim measurement context that the written number does not provide.
Course rules still matter
If an instructor gives a specific convention for ambiguous zeros, use that convention for final answers.