How do I calculate a percentage of a number?

Select the percentage of option, then enter the percentage in the first field and the number in the second field. For example, to find 15 percent of 200, enter 15 and 200. The result will be 30.

How do I find what percent one number is of another?

Select the what percent option. Enter the smaller or partial number first, then the total second. For example, if you scored 45 out of 60, enter 45 and 60 to get 75 percent.

How do I calculate percentage increase or decrease?

Use the percentage change option. Enter the original value first and the new value second. The calculator shows the percentage difference as positive for increases and negative for decreases.

How do I add a percentage to a number?

Select increase by percentage. Enter the starting number first and the percentage to add second. For example, 80 increased by 10 percent equals 88.

How do I subtract a percentage from a number?

Select decrease by percentage. Enter the original number first and the percentage to subtract second. For example, 80 decreased by 10 percent equals 72.

Can I use decimals in my calculations?

Yes, the calculator handles decimal numbers in all fields. You can enter values like 15.5 percent or calculate with prices like 49.99 without any issues.

Calculators

Percentage Calculator

Calculate percentages, increases, decreases, and differences.

Percentage (%)

Number

Frequently Asked Questions

About this tool

What is a Percentage Calculator?

A percentage calculator is an online tool that performs various percentage-based mathematical operations instantly. It can find what percentage one number is of another, calculate percentage increases and decreases, and determine the result of adding or subtracting a percentage from a number.

Percentages appear constantly in daily life, from sales discounts and tax calculations to grade computations and financial analysis. Having a reliable calculator that handles these operations eliminates manual math errors and saves time.

Our percentage calculator offers multiple calculation modes to cover the most common percentage-related questions. Enter your numbers, select the calculation type, and get accurate results immediately.

How to Use the Percentage Calculator

Using this percentage calculator requires just a few simple steps.

First, select the type of calculation you need from the available options. Each option handles a different type of percentage question.

Second, enter your numbers in the input fields. The labels change based on your selected calculation type to guide you on what values to enter.

Third, click the calculate button or press enter to see your result. The answer appears prominently below the inputs.

You can change calculation types at any time without clearing your previous inputs. The calculator processes all standard numbers including decimals.

Types of Percentage Calculations

The percentage of a number calculation finds what a given percentage of a value equals. For example, finding 20 percent of 150 gives you 30. This is useful for calculating tips, discounts, or portions of any total.

The what percent calculation determines what percentage one number represents of another. For example, 30 is what percent of 150 gives you 20 percent. Use this for finding scores, completion rates, or proportions.

The percentage change calculation finds the percentage difference between two values. It shows how much something increased or decreased as a percentage. This applies to price changes, growth rates, and performance metrics.

The increase by percentage calculation adds a percentage to a starting value. For example, 100 increased by 25 percent equals 125. This works for applying markups, raises, and growth projections.

The decrease by percentage calculation subtracts a percentage from a starting value. For example, 100 decreased by 25 percent equals 75. This handles discounts, losses, and reductions.

Common Use Cases

Students use percentage calculators for grade calculations and test score analysis. Figuring out what score you need on a final exam or what your current percentage is becomes straightforward.

Shoppers calculate sale prices and discounts. When a store offers 30 percent off a 79.99 item, the calculator instantly tells you the savings and final price.

Financial professionals compute interest rates, investment returns, and profit margins. Percentage calculations are fundamental to business analysis and reporting.

Teachers determine grade distributions and curve adjustments. Converting raw scores to percentages and adjusting scales becomes quick work.

Health and fitness tracking often involves percentages. Body composition, goal progress, and nutritional values frequently need percentage calculations.

Real estate professionals calculate commission rates, price appreciation, and mortgage comparisons. Property values and fees are typically expressed as percentages.

Why Use an Online Percentage Calculator

Online percentage calculators provide instant access without apps or downloads. Open any browser on any device and start calculating immediately.

Multiple calculation modes in one tool eliminate confusion. Instead of remembering different formulas or setting up spreadsheets, select the operation you need and enter values.

Accuracy is ensured through proper mathematical implementation. Mental math with percentages often leads to errors, especially with complex numbers or chained calculations.

The interface guides you through each calculation type. Clear labels and descriptions help you choose the right operation even if you are unsure about percentage math terminology.

Results are displayed clearly and can be used immediately. No need to interpret formula outputs or worry about decimal placement.

The calculator is free with no limits on usage. Calculate as many percentages as you need without subscriptions or account requirements.