Enter any two numbers to instantly calculate a percentage — no formulas, no button clicks. Find X% of a number, calculate a ratio, or work out percentage change. This free percent calculator provides instant results as you type.
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e.g. What is 15% of $84? → $12.60
e.g. 43 out of 50 marks → 86%
e.g. Price from $80 → $100 → 25% increase
Enter any two numbers to instantly calculate a percentage — no formulas, no button clicks, no waiting. This free percent calculator covers the three most common percentage problems in a single page: finding a percentage of a number, calculating what percent one value is of another, and working out the percentage change between two figures. Results update in real time as you type.
1. What is X% of Y? — the most common percentage question. Use this for discounts ("what is 20% off $85?"), tips ("what is 18% of $47.50?"), tax ("what is 8.5% of $120?"), or any situation where you need to find a portion of a value.
Formula: result = (X / 100) × Y
2. X is what % of Y? — use this to find a ratio as a percentage. Common uses: exam scores ("I got 43 out of 50 — what percentage is that?"), survey results ("120 out of 500 responded — what percent?"), or market share figures.
Formula: result = (X / Y) × 100
3. Percentage increase / decrease — use this to measure change between two values. Common uses: revenue growth ("sales went from $50,000 to $62,000 — what's the increase?"), price drops ("this item went from $25 to $19 — what's the decrease?"), or any before/after comparison.
Formula: result = ((new − old) / old) × 100
When calculating percentage change, direction matters. If the "From" value is smaller than the "To" value the result is a percentage increase; if larger, it's a decrease. The percent calculator labels this automatically.
For precise financial calculations you can enter decimals in any field — entering 8.75 as a percentage or 1250.50 as a base value produces results rounded to two decimal places.
One common confusion: percentage points and percent are not the same thing. If an interest rate rises from 2% to 5%, that's a 3 percentage-point increase but a 150% relative increase. This distinction matters in financial reporting and journalism.
This percentage calculator runs entirely in your browser. No inputs are sent to any server. Works offline once the page loads.
Divide the part by the whole and multiply by 100. For example, 30 is what percent of 120? (30 / 120) × 100 = 25%. Use the "X is what % of Y?" calculator above — enter the two numbers and the result appears instantly.
Percentage change = ((new value − old value) / old value) × 100. A positive result is an increase; negative is a decrease. Example: price went from $80 to $100 → ((100 − 80) / 80) × 100 = 25% increase. Use the third calculator above.
For a discount: original = final ÷ (1 − discount%). If a price is $90 after a 10% discount: 90 ÷ 0.90 = $100 original. For a markup: original = final ÷ (1 + markup%). This is the reverse percentage formula.
Percentage points measure the arithmetic difference between two percentages. If interest rates go from 2% to 5%, that is a 3 percentage point increase, but a 150% relative increase. These are very different things — be careful which one is being reported.
For compound growth over multiple periods use: final = initial × (1 + rate)^periods. Example: 5% annual growth over 3 years → 1000 × (1.05)³ = $1,157.63. Use the Compound Interest Calculator for detailed compound growth calculations.