Free Online Calculators
Percentage, difference, change
This calculator helps you work out percentages, differences, and percentage changes in seconds. It applies standard formulas like (part ÷ whole) × 100 so you don't have to. Perfect for everyday tasks, schoolwork, or quick financial checks.
20% of 100 is 20.00. The full percentage table for the most common rates and base values is right below the calculator.
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| Rate \ Base value | 50 | 100 | 200 | 500 | 1000 | 2000 | 5000 | 10000 |
|---|---|---|---|---|---|---|---|---|
| 5 % | 2.50 | 5.00 | 10.00 | 25.00 | 50.00 | 100.00 | 250.00 | 500.00 |
| 10 % | 5.00 | 10.00 | 20.00 | 50.00 | 100.00 | 200.00 | 500.00 | 1,000.00 |
| 15 % | 7.50 | 15.00 | 30.00 | 75.00 | 150.00 | 300.00 | 750.00 | 1,500.00 |
| 19 % | 9.50 | 19.00 | 38.00 | 95.00 | 190.00 | 380.00 | 950.00 | 1,900.00 |
| 20 % | 10.00 | 20.00 | 40.00 | 100.00 | 200.00 | 400.00 | 1,000.00 | 2,000.00 |
| 25 % | 12.50 | 25.00 | 50.00 | 125.00 | 250.00 | 500.00 | 1,250.00 | 2,500.00 |
| 30 % | 15.00 | 30.00 | 60.00 | 150.00 | 300.00 | 600.00 | 1,500.00 | 3,000.00 |
| 40 % | 20.00 | 40.00 | 80.00 | 200.00 | 400.00 | 800.00 | 2,000.00 | 4,000.00 |
| 50 % | 25.00 | 50.00 | 100.00 | 250.00 | 500.00 | 1,000.00 | 2,500.00 | 5,000.00 |
| 60 % | 30.00 | 60.00 | 120.00 | 300.00 | 600.00 | 1,200.00 | 3,000.00 | 6,000.00 |
| 75 % | 37.50 | 75.00 | 150.00 | 375.00 | 750.00 | 1,500.00 | 3,750.00 | 7,500.00 |
| 80 % | 40.00 | 80.00 | 160.00 | 400.00 | 800.00 | 1,600.00 | 4,000.00 | 8,000.00 |
| 90 % | 45.00 | 90.00 | 180.00 | 450.00 | 900.00 | 1,800.00 | 4,500.00 | 9,000.00 |
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30. In the calculator, use the mode X% of Y.
Divide the part by the total and multiply by 100. For example, 45 out of 60 is 45 ÷ 60 × 100 = 75%. In the calculator, use the mode X is what % of Y.
Subtract the old value from the new value, divide the result by the old value and multiply by 100. From 80 to 100 the increase is (100 − 80) ÷ 80 × 100 = 25%.
Use (new − old) ÷ old × 100. A negative result is a decrease, so going from 50 to 40 is a change of −20%. In the calculator, enter the old value as A and the new value as B in the percentage difference mode.
Use the compound annual growth rate: (end value ÷ start value)^(1 ÷ years) − 1. Growing from 100 to 150 in three years gives about 14.5% per year, not 50% ÷ 3 = 16.7%, because each year builds on the previous one.
Divide by 100, which moves the decimal point two places to the left: 7.5% = 0.075 and 120% = 1.2.
Whether you're figuring out a discount at the store, calculating interest on a loan, or tracking how much your salary has changed, percentages are everywhere. Our free Percentage Calculator takes the guesswork out of all three core percentage calculations — giving you accurate results in seconds.
This tool handles three essential types of percentage math:
Each mode is clearly labeled and instantly returns your result — no formulas to memorize, no manual calculations needed.
Enter your percentage and your base value. The calculator immediately tells you the corresponding amount. For instance, if you want to find 15% of $80, the answer is $12. This is perfect for working out tips, discounts, or tax amounts without breaking a sweat.
Enter a part X and a total Y to see what share X is of Y. Example: 30 out of 200 is 15%. Great for test scores, shares of a budget or completion rates.
The mode labeled "Percentage difference" takes a starting value A and an ending value B and returns the percentage increase or decrease relative to A: (B − A) ÷ A × 100. Example: A stock was worth $200 and is now worth $250. That's a 25% increase, shown as +25%. This feature is essential for tracking business growth, investment returns, or price inflation over time.
The percentage calculator is useful in dozens of everyday situations:
You find a pair of shoes originally priced at $150, now 40% off. Using the calculator: 40% of $150 = $60. Your savings are $60, so you pay just $90. Simple and instant.
Your annual salary went from $48,000 to $51,600. Enter both values into the percentage change calculator: the result is a 7.5% raise. Now you can compare that to the inflation rate and see if you're truly better off.
Student A scored 78 and Student B scored 92. Enter 78 as value A and 92 as value B: student B scored about 17.95% more than student A. This kind of comparison is useful for teachers evaluating performance gaps between students.
The basic formula is: Percentage Value = (Base Value × Percentage) ÷ 100. Our calculator applies this formula automatically, so you never have to remember it yourself.
Percentage change measures the shift from a starting point to an ending point and has a direction (increase or decrease). This calculator's "Percentage difference" mode works this way, always relative to value A. The symmetric percentage difference compares two values without implying which came first and uses their average as the reference: for $90 and $110 that's 20 ÷ 100 = 20%. The calculator doesn't show that symmetric figure directly.
Yes. Simply enter a starting value that is higher than the ending value, and the calculator will return a negative percentage — indicating a decrease. For example, a price drop from $100 to $75 equals a 25% decrease.
Yes. The calculator provides precise decimal results suitable for everyday financial calculations such as interest, discounts, and investment returns. For complex financial modeling, always consult a qualified advisor.
Absolutely. The percentage calculator is fully responsive and works seamlessly on all modern smartphones and tablets — no app download required.