Proportion Calculator
Enter nonzero finite values in any three of A, B, C, and D. The calculator solves the blank value locally.
A QUICK WALKTHROUGH
How to use this tool
- Leave exactly one of A, B, C, and D blank.
- Enter finite nonzero numbers in the other three fields.
- Calculate to fill the missing value in A:B = C:D.
Exactly one missing value
The calculator solves A:B = C:D when exactly one field is blank. The three entered values must be finite and nonzero; the current tool rejects zero in any filled field.
Local calculation
Validation and arithmetic happen in your browser. The formula used depends on which of A, B, C, or D is blank.
GOOD TO KNOW
Common questions
Can I use zero?
No. The current calculator requires each of the three entered values to be nonzero so the proportion can be solved.
Are decimals and negative values supported?
Yes. Finite decimal and negative values are supported, but zero is rejected.