Frequently Asked Questions
Everything you need to know about the Ratio Calculator.
How does the ratio calculator work?
Choose simplify, solve proportion, scale, or split mode, enter your values, and it computes the result with full working shown.
Is it free?
Completely free, no sign-up, downloads, or limits.
How does it solve a proportion?
Using cross multiplication (A × D = B × C), shown step by step to find the missing value.
Can it simplify a ratio with three terms?
Yes, ratios like A:B:C are simplified to lowest terms using the greatest common factor of all terms.
What does "split a total by ratio" mean?
Dividing a total quantity into parts proportional to a given ratio — e.g. splitting $100 in a 2:3 ratio gives $40 and $60.
Can it scale a ratio up or down?
Yes, provide a scale factor and it scales the whole ratio proportionally.
What if I enter a zero in a proportion?
A zero term that makes the proportion undefined is flagged clearly rather than producing an error.
Are results shown as fractions or decimals?
Whole numbers and simplified values where possible; decimals only when the split naturally requires them.
Is my data stored?
No; everything runs in your browser and isn't stored or sent.
Does it work on mobile?
Yes, fully responsive on any screen size.