% Fractions & Percent
Proportion Calculator
Solve proportions a/b = c/x for the missing value.
Result
FAQs
What does the Proportion Calculator do?
The free MathDigits Proportion Calculator (proportion calculator) helps you solve proportions a/b = c/x for the missing value. Results appear instantly in your browser — no account required.
How do I use the Proportion Calculator correctly?
Enter each value in the labeled fields, double-check signs and decimals, then tap Calculate. If a field is optional, leave it blank only when the tool allows it.
Is the Proportion Calculator free for students and teachers?
Yes. All MathDigits online calculators are free. Teachers can project the page; students can verify homework steps.
How should I practice after using the Proportion tool?
Confirm one answer here, then switch to a printable worksheet or timed practice quiz on MathDigits so you build fluency without relying on the calculator every time.