Use this free online percentage calculator to find a percentage of a number, calculate what percent one value is of another, measure percentage change, or increase or decrease a value by a percentage. Get instant results with clear formulas.
01 / CALCULATION MODE
02 / ENTER THE NUMBERS
03 / YOUR RESULT
Formula
20 ÷ 100 × 150 = 30
Your numbers and calculations stay in your browser and are not uploaded or stored.
How it works
Choose the supported file from your device.
Use the available settings for the result you need.
Save the completed file directly to your device.
Select one of the four calculation modes: X% of Y, X is what % of Y, Percentage Change, or Increase / Decrease by %. Enter your numbers to see the result and formula. For percentage increases or decreases, choose the relevant direction. You can copy or share your result, or reset the calculator to start again.
Calculate everyday percentages without manual formulas. Find discounts, price increases, percentage differences, and changes between two values. View instant results with a formula, use decimal values, and calculate directly in your browser without creating an account.
Your calculation inputs are processed in your browser and are not uploaded to Nimzoa's application servers for calculation. Website analytics are separate from the numbers you enter.
Divide X by 100 and multiply by Y. For example, 20% of 150 is 30.
Divide the part by the total and multiply by 100. The total cannot be zero.
Subtract the starting value from the new value, divide by the magnitude of the starting value, and multiply by 100. A zero starting value has no defined percentage change.
Yes. Choose Increase or Decrease, then enter a percentage and original value to see the adjusted result.
No. Percentage calculations happen locally in your browser.
Multiply the original price by 0.15 to find the discount amount. Subtract that amount from the original price to find the discounted price. For example, 15% off $200 is a $30 discount, leaving $170.
Percentage increase describes an upward change. Percentage change can be positive or negative, depending on whether the new value is higher or lower than the original value.
Yes. The Percentage Calculator supports decimal values, allowing you to calculate percentages of amounts that are not whole numbers.
Need to calculate a percentage quickly? Nimzoa's free online percentage calculator helps you find a percentage of a number, work out what percentage one number is of another, calculate percentage change, and increase or decrease a value by a chosen percentage.
Enter your numbers, select the calculation you need, and see the answer along with the formula. Whether you're checking a shopping discount, comparing prices, reviewing business figures, or solving a math problem, this calculator makes common percentage calculations easier.
Choose a calculation mode. Select X% of Y, X is what % of Y, Percentage Change, or Increase / Decrease by %.
Enter your values. Type the numbers you want to calculate. Decimal values are supported.
Check the result. Review the calculated answer and the formula shown beneath it.
Copy or share. Use the available result actions if you need to save or share your calculation.
You can change your inputs and calculate again without starting a new session.
Use the X% of Y mode when you want to calculate a specific percentage of a value.
The formula is:
Percentage amount = (Percentage ÷ 100) × Number
(20 ÷ 100) × 150 = 30
This means 20% of 150 is 30.
This calculation is useful for finding a percentage of a price, estimating a commission, checking a tax amount, or working out a portion of a total.
Use X is what % of Y when you know two values and want to find their percentage relationship.
The formula is:
Percentage = (Part ÷ Total) × 100
(45 ÷ 180) × 100 = 25%
Therefore, 45 is 25% of 180.
You can use this calculation to find a test score percentage, a completed portion of a task, a share of total sales, or a proportion of a budget.
The total used as the denominator must not be zero.
A percentage change calculator shows how much a value has increased or decreased relative to its original amount.
The formula is:
Percentage change = ((New Value − Original Value) ÷ Original Value) × 100
((100 − 80) ÷ 80) × 100 = 25%
The value increased by 25%.
((150 − 200) ÷ 200) × 100 = −25%
The negative result indicates a 25% decrease.
Percentage change is useful for comparing prices, revenue, expenses, measurements, and other values over time.
When the original value is zero, the usual percentage change formula is undefined. If you're comparing signed values, interpret the result in the context of the original number.
A percentage increase adds a specified proportion to the original value.
The formula is:
Increased value = Original Value × (1 + Percentage ÷ 100)
250 × (1 + 12 ÷ 100) = 280
The increase is 30, giving a new value of 280.
This is useful for estimating price increases, salary adjustments, budget growth, and other upward changes.
A percentage decrease subtracts a specified proportion from the original value.
The formula is:
Decreased value = Original Value × (1 − Percentage ÷ 100)
250 × (1 − 12 ÷ 100) = 220
The reduction is 30, giving a new value of 220.
This calculation is useful for sale prices, discounts, cost reductions, and budget adjustments.
Calculation | Formula |
|---|---|
X% of Y | (X ÷ 100) × Y |
X is what % of Y | (X ÷ Y) × 100 |
Percentage change | ((New − Original) ÷ Original) × 100 |
Increase by X% | Original × (1 + X ÷ 100) |
Decrease by X% | Original × (1 − X ÷ 100) |
For formulas that divide by a value, the denominator must not be zero.
Find how much money a percentage discount represents, or calculate a reduced price using the percentage decrease mode.
For example, a 15% discount on a $120 item reduces its price by $18, making the final price $102 before any additional charges.
Use percentages to compare revenue changes, calculate a share of total expenses, or estimate increases in costs.
For a more specialized calculation involving selling prices and profitability, explore Nimzoa's Profit Margin Calculator.
Convert marks into a percentage using the part-versus-total calculation.
For example, 72 marks out of 90 equals 80%.
Compare an old price with a new price to calculate the percentage increase or decrease.
This can help you understand how much a product, service, or recurring expense has changed.
Percentages are useful for checking survey results, measuring progress, dividing budgets, comparing quantities, and understanding proportions.
These terms are sometimes used interchangeably, but they can mean different things.
Percentage change measures a new value relative to a defined original value. It has a direction: an increase or decrease.
Percentage difference can refer to a comparison between two values without treating either as the starting value. One common approach divides their absolute difference by their average.
Nimzoa's Percentage Change mode uses the original value as the reference. It should not be confused with a separate symmetric percentage difference calculation.
Nimzoa brings several common percentage calculations together in one free browser-based tool.
Instead of remembering a different formula for each task, choose the appropriate mode and enter your values. The calculator displays the answer and the calculation used to obtain it.
It is suitable for students, shoppers, freelancers, professionals, and anyone who needs a quick percentage calculation.
Percentage calculations take place directly in your browser. The numbers you enter are not uploaded to Nimzoa's application servers for calculation.
You do not need to create an account to use the calculator. Website analytics are separate from your calculation inputs.
For additional information about website data practices, see Nimzoa's Privacy Policy.
Use the Percentage Calculator above to find percentages, compare changes, and increase or decrease values.
For related tasks, try Nimzoa's Discount Calculator, Profit Margin Calculator, or Compound Interest Calculator. These tools address more specialized calculations, while this page focuses on general percentage formulas.