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Percentage Calculator
6 ways to calculate percentages — instantly. Choose your calculation type below.
%X% of Y
?%X is ?% of Y
↑% Increase
↓% Decrease
Δ% Change
÷% Difference
Calculate
What is X% of Y?
% of
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🔢 About This Calculator
Our free Percentage Calculator solves all six common types of percentage problems instantly — from finding what percent of a number is, to calculating percentage increase, decrease, difference, and change. No more struggling with percent formulas — just enter your numbers and get the answer.
Whether you're calculating a sale discount, figuring out your test score percentage, computing a salary raise, or analyzing data changes, this tool covers every percentage calculation you'll ever need.
📋 How to Use the Percentage Calculator
1
Select the calculation type — Choose from six types: percent of a number, what percent is X of Y, percent increase, percent decrease, percent change, or percent difference.
2
Enter your values — Input the required numbers for your chosen calculation type. Fields update automatically based on your selection.
3
Click Calculate — See the answer instantly with a clear formula explanation showing exactly how the result was computed.
4
Use the result — Copy the answer for your spreadsheet, homework, shopping, or financial calculation.
5
Try multiple types — Switch between different percentage calculation types without refreshing. All six modes are available on one page.
❓ Frequently Asked Questions
Divide the first number by the second number, then multiply by 100. Formula: (Part / Whole) x 100 = Percentage. Example: 45 is what percent of 180? Answer: (45 / 180) x 100 = 25%. Our calculator handles this automatically when you select the correct calculation type.
Subtract the original value from the new value, divide by the original value, then multiply by 100. Formula: ((New - Old) / Old) x 100. Example: price went from $80 to $100. Increase = ((100-80)/80) x 100 = 25% increase. A positive result means an increase, a negative result means a decrease.
The fastest mental math trick: to find 10%, move the decimal point one place left. Then derive other percentages from that. Example: 10% of $45 = $4.50. Therefore: 20% = $9.00, 5% = $2.25, 15% = $6.75. For exact calculations with any percentage, use our calculator.
Percentage change measures how much a value has changed from a specific starting point (directional — can be positive or negative). Percentage difference compares two values without implying one is the original, using the average of both as the denominator. Use percentage change when comparing a before and after value, and percentage difference when comparing two equivalent items.
Multiply the original price by (1 minus the discount rate expressed as a decimal). Formula: Sale Price = Original Price x (1 - Discount%). Example: 30% off $120 = $120 x (1 - 0.30) = $120 x 0.70 = $84. To find savings: $120 x 0.30 = $36 savings.