Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Math
Proportion Calculator
Find the missing fourth value d in any proportion a/b = c/d when three values are known. Perfect for scaling recipes, converting units, solving map distances, and cross-multiplication problems.
Fill in the required fields to see your result.
Math
Percentage Calculator
Find what a given percentage of a number is β for example, 18% of a $42 restaurant bill, or 7.5% sales tax on a $129 purchase. This calculator handles the most common percentage question that comes up in everyday math: "what is P% of N?" Enter the percentage and the base number, and you get the exact partial amount. It is the building block behind tip calculators, discount calculators, tax calculators, and most quick financial estimates you do on the fly.
Fill in the required fields to see your result.
Key differences
| Proportion Calculator | Percentage Calculator | |
|---|---|---|
| Category | Math | Math |
| Inputs required | 3 | 2 |
| Result | d | Result |
| What it does | Find the missing fourth value d in any proportion a/b = c/d when three values are known. Perfect for scaling recipes, converting units, solving map distances, and cross-multiplication problems. | Find what a given percentage of a number is β for example, 18% of a $42 restaurant bill, or 7.5% sales tax on a $129 purchase. This calculator handles the most common percentage question that comes up in everyday math: "what is P% of N?" Enter the percentage and the base number, and you get the exact partial amount. It is the building block behind tip calculators, discount calculators, tax calculators, and most quick financial estimates you do on the fly. |