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Equivalent Ratio Calculator
Find equivalent ratios and the missing value in a proportion.
scale Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Equivalent ratio
Compare Your Options And Get Clear Answers
Find equivalent ratios and the missing value in a proportion.
Equivalent Ratio Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: a : b = c : d, d = b c / a.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Equivalent Quick Guide
Typical values for reference.
| a | b | c | Ratio |
|---|---|---|---|
| 3 | 4 | 15 | 15.00 : 20.00 |
| 1 | 2 | 10 | 10.00 : 20.00 |
| 5 | 8 | 20 | 20.00 : 32.00 |
| 7 | 3 | 21 | 21.00 : 9.00 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Equivalent Ratio Calculator FAQ
Answers to common questions about this calculator.
Ratios that represent the same relationship, such as 1:2 and 3:6.
Cross multiply and divide.
Divide both terms by their greatest common divisor.
Yes.