About
This site is built as a free educational tool for students, teachers, and lab report writers.
Use the calculatorIt helps users count, round, and calculate significant figures while showing the rule behind each answer. The examples focus on chemistry, physics, and lab-report situations where written precision matters.
The calculator keeps the written value visible so students can understand which digits count and why.
The calculator logic is covered by automated tests for common confusing inputs such as 0.00450, 100, 100., 12.5 + 0.003, 2.50 x 3.1, and 3.76e4.
If a teacher, student, or reviewer finds a rule explanation that conflicts with a course convention, the example can be reviewed and clarified without storing user calculator inputs.
It does not store user inputs, replace course instructions, or claim measurement context that the written number does not provide.
If an instructor gives a specific convention for ambiguous zeros, use that convention for final answers.
