Method
For A:B = C:D, cross multiplication gives A × D = B × C. A two-number ratio is simplified by dividing both values by their greatest common factor.
Example
3:4 = 12:16 because both parts were multiplied by 4.
Limits
Check inputs and units. Important academic, financial or professional decisions should be confirmed against an appropriate source.
Common questions
What does the ratio calculator calculate?
Solve a proportion or simplify a ratio into its lowest terms.
Does this ratio calculator show its method?
Yes. The result includes the central formula or working needed to check the answer.
Are my values uploaded?
No. The calculation runs in this browser and does not require an account.