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.
| 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.
Input two values and find out how different they are in percentage terms. The percentage difference is calculated relative to the average of both values, making it a symmetric measure. Example: Product A costs $90 and Product B costs $110. The percentage difference is about 20%. Great for comparing prices, test scores, or any two figures side by side.
Enter a starting value and an ending value to discover the percentage increase or decrease. Example: A stock was worth $200 and is now worth $250. That's a 25% increase. 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. The percentage difference is approximately 16.5%. 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). Percentage difference compares two values without implying which came first — it's symmetric and uses the average of both as the reference.
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.