Enter Your Values
Select a calculation mode first. Enter values using decimals or commas. Review the answer and detailed working immediately below.
Formula Used
| Calculation | Formula |
|---|---|
| Percentage of a number | (Percentage ÷ 100) × Number |
| One number as a percentage | (Part ÷ Whole) × 100 |
| Percentage change | ((New − Original) ÷ |Original|) × 100 |
| Percentage difference | |A − B| ÷ ((|A| + |B|) ÷ 2) × 100 |
| Reverse increase | Final ÷ (1 + Percentage ÷ 100) |
| Reverse decrease | Final ÷ (1 − Percentage ÷ 100) |
| Profit margin | (Revenue − Cost) ÷ Revenue × 100 |
| Target-margin price | Cost ÷ (1 − Margin ÷ 100) |
How to Use This Calculator
- Select the calculation that matches your question.
- Enter the requested values and optional display settings.
- Add successive changes when testing compounded percentage movements.
- Press calculate to view formulas and detailed steps.
- Copy, export, print, or share the completed result.
Example Calculations
| Calculation | Example | Result |
|---|---|---|
| Percentage of a number | 20% of 250 | 50 |
| Number as a percentage | 50 out of 250 | 20% |
| Percentage increase | 200 to 250 | 25% |
| Percentage decrease | 250 to 200 | 20% |
| Add percentage | 250 plus 20% | 300 |
| Remove percentage | 250 minus 20% | 200 |
| Percentage difference | 200 and 250 | 22.22% |
| Successive changes | 100, then +10%, then −10% | 99 |
Percentage Conversion Table
| Percentage | Decimal | Fraction |
|---|---|---|
| 1% | 0.01 | 1/100 |
| 5% | 0.05 | 1/20 |
| 10% | 0.10 | 1/10 |
| 20% | 0.20 | 1/5 |
| 25% | 0.25 | 1/4 |
| 50% | 0.50 | 1/2 |
| 75% | 0.75 | 3/4 |
| 100% | 1.00 | 1 |
Frequently Asked Questions
How do I find a percentage of a number?
Divide the percentage by one hundred first. Multiply that decimal by the chosen number. The calculator displays every step for easier checking.
How do I find what percentage one number is of another?
Divide the part by the whole value. Multiply the quotient by one hundred afterwards. A zero whole cannot produce a valid percentage.
What is the difference between percentage change and percentage difference?
Percentage change uses an original reference value. Percentage difference treats both values without direction. It compares their difference against their average magnitude.
What are percentage points?
Percentage points compare two stated percentage rates. Subtract the starting rate from the ending rate. This differs from calculating their relative percentage change.
Why do successive percentage changes not simply add?
Each change applies to the latest running value. The calculation therefore multiplies successive growth factors. A ten-percent rise then fall produces ninety-nine overall.
How is profit margin different from markup?
Profit margin divides profit by selling revenue. Markup divides profit by the original cost. Their percentages differ despite using identical monetary profit.
Can this calculator handle negative values?
Yes, most modes accept negative numeric values. Percentage-change formulas use the original value's magnitude. Review financial interpretations carefully when values become negative.
Can I use commas and decimals?
Yes, commas are removed before numeric validation. Decimal values remain available throughout the calculation. Choose up to ten displayed decimal places afterwards.
Can I export my result?
Yes, results can download as CSV files. PDF export and browser printing are also included. The copy button creates one complete reusable summary.