⚖️Ratio Calculator
Simplify, solve, scale, or split ratios — with the working shown every time.
Free Ratio Calculator
Whether you're simplifying a ratio, solving a proportion, or splitting a total fairly, our free ratio calculator handles it instantly — with the working shown every time.
Simplify any ratio to lowest terms using the greatest common factor, solve for a missing value in a proportion like A:B = C:D via cross multiplication, scale a ratio up or down by a factor, or split a total quantity proportionally across two or more parts — seeing exactly how much each share is worth and what fraction of the whole it represents.
Every mode shows the underlying arithmetic, not just the final answer. Invalid inputs, like a zero term in a proportion, are flagged clearly. No sign-up, no downloads, no limits.
About the Ratio Calculator
Features
Simplify
Reduce two- or three-term ratios to lowest terms using the GCF.
Solve proportion
Cross-multiplication solving for any missing term in A:B = C:D.
Scale
Multiply a ratio by a scale factor to get an equivalent ratio.
Split a total
Divide a quantity proportionally across two or more parts.
Frequently Asked Questions
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.