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Simplify 21:63
The simplified ratio of 21:63 is 1:3. Free ratio calculator with GCD breakdown.
1:3
GCD of 21 and 63 is 21. Simplified: 21/21 : 63/21 = 1:3
How This Was Calculated
Simplification: Divide both terms by their GCD.A:B = (A/GCD) : (B/GCD)
Solving proportions: A/B = C/D — cross-multiply to find the missing value.
Scaling: Multiply both terms by the scale factor.
Quick Reference Table
| Input | Result |
|---|---|
| 21 / 58 | 21:58 |
| 21 / 61 | 21:61 |
| 21 / 62 | 21:62 |
| 21 / 64 | 21:64 |
| 21 / 65 | 21:65 |
| 21 / 68 | 21:68 |
Frequently Asked Questions
What is a ratio?
A ratio compares two quantities by division.
How do I simplify a ratio?
Divide both numbers by their greatest common divisor (GCD).
Can ratios have decimal values?
Yes, but simplified ratios are typically expressed as whole numbers.