Percentage Calculator
Calculate any percentage instantly: discounts, tips, increases, decreases, and more. Free with step-by-step solutions.
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Basic Calculator
Result
Enter values to see results
Quick Formulas
(X × Y) ÷ 100(X ÷ Y) × 100((New-Old) ÷ Old) × 100Mental Math Tips
Why Choose Filator's Percentage Calculator?
Instant Calculations
Get results as you type with real-time calculations. No waiting, no clicking buttons—just instant, accurate answers.
100% Private
All calculations happen in your browser. Your numbers never leave your device—complete privacy guaranteed.
All Calculation Types
Calculate percentages, increases, decreases, differences, discounts, tips, and more—all in one tool.
How to Calculate Percentages Online for Free
Filator's free percentage calculator lets you instantly calculate any percentage directly in your browser—no signup required, no server uploads, complete privacy. Whether you need to find what percent X is of Y, calculate percentage increase or decrease, figure out discounts, or compute tips, our calculator handles it all with step-by-step explanations.
Why Choose Filator's Percentage Calculator?
Instant Real-Time Results
See results as you type with zero delay. Unlike competitors that require clicking calculate buttons, everything updates instantly in your browser.
Step-by-Step Solutions
Understand how each calculation works with clear explanations. Perfect for students learning percentage concepts or anyone who wants to verify their work.
All Percentage Types
One tool for everything: X% of Y, what percent X is of Y, percentage increase/decrease, percentage difference, discounts, tips, markup, margin, and more.
Works Offline
Install as a PWA and calculate percentages without internet. Perfect for shopping, studying, or anywhere you need quick calculations without connectivity.
Percentage Calculation Formulas
| Calculation Type | Formula | Example |
|---|---|---|
| X% of Y | (X × Y) ÷ 100 | 20% of 150 = 30 |
| X is what % of Y | (X ÷ Y) × 100 | 25 is 12.5% of 200 |
| Percentage Increase | ((New - Old) ÷ Old) × 100 | 100 to 125 = 25% increase |
| Percentage Decrease | ((Old - New) ÷ Old) × 100 | 200 to 150 = 25% decrease |
| Percentage Difference | |A - B| ÷ ((A + B) ÷ 2) × 100 | Diff between 10 and 15 = 40% |
| Discount Amount | (Price × Discount%) ÷ 100 | $80 at 20% off = $16 savings |
How to Calculate Percentages Step-by-Step
- 1.Select the type of percentage calculation you need (basic, increase/decrease, discount, etc.)
- 2.Enter your numbers in the input fields provided
- 3.View your result instantly—no need to click any buttons
- 4.Review the step-by-step solution to understand the calculation
- 5.Copy the result or try another calculation
Understanding Percentage Concepts
Percentage vs Percentage Points
This is a common source of confusion. If interest rates rise from 3% to 5%, that's a 2 percentage point increase, but a 66.67% relative increase. Percentage points measure the absolute difference between two percentages, while percentage measures relative change.
Markup vs Margin
Markup is calculated on cost price: ((Selling - Cost) ÷ Cost) × 100. Margin is calculated on selling price: ((Selling - Cost) ÷ Selling) × 100. A 50% markup equals roughly 33% margin.
Compound Percentage Changes
A 10% increase followed by a 10% decrease doesn't return you to the original value. Starting at 100, +10% = 110, then -10% = 99. Multiple percentage changes multiply, not add.
Common Use Cases
Shopping Discounts
Calculate sale prices, compare discounts, and figure out your actual savings during Black Friday, clearance sales, or when using coupons
Restaurant Tips
Calculate 15%, 18%, 20%, or custom tip percentages on your restaurant bill, and split the total among multiple people
Test Scores & Grades
Convert points to percentages, calculate your grade on exams, and determine what score you need on upcoming tests to reach your target grade
Business & Finance
Calculate profit margins, markup percentages, ROI, salary increases, investment returns, and tax amounts for business decisions
Frequently Asked Questions
How do I calculate what percent X is of Y?
Divide X by Y and multiply by 100. The formula is: (X ÷ Y) × 100 = Percentage. For example, to find what percent 25 is of 200: (25 ÷ 200) × 100 = 12.5%.
How do I calculate X percent of Y?
Multiply Y by X and divide by 100. The formula is: (X × Y) ÷ 100 = Result. For example, 20% of 150 = (20 × 150) ÷ 100 = 30.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Formula: ((New - Original) ÷ Original) × 100. Example: from 100 to 125 = ((125 - 100) ÷ 100) × 100 = 25% increase.
How do I calculate a discount?
Multiply the original price by the discount percentage, then divide by 100. For a 20% discount on $80: ($80 × 20) ÷ 100 = $16 discount. Final price: $80 - $16 = $64.
What's the difference between percentage and percentage points?
Percentage points measure the absolute difference between two percentages. If interest rates rise from 3% to 5%, that's 2 percentage points, but a 66.67% relative increase. Understanding this distinction is crucial for accurate financial analysis.
How do I calculate tip at a restaurant?
Multiply the bill by the tip percentage and divide by 100. For a 15% tip on $47.83: ($47.83 × 15) ÷ 100 = $7.17 tip. Quick trick: for 15%, find 10% ($4.78) and add half of that ($2.39) = $7.17.
Can I use this calculator on mobile?
Yes, our percentage calculator works perfectly on all devices including smartphones and tablets. It's also available as a PWA (Progressive Web App) for offline use—perfect for calculating discounts while shopping.
Is this percentage calculator free?
Yes, Filator's percentage calculator is completely free with no signup required. All calculations happen in your browser, so your data stays private. There are no usage limits or premium features locked behind paywalls.
Ready to Calculate Percentages?
Start calculating any percentage instantly with no signup, complete privacy, and step-by-step explanations. Whether you need discounts, tips, increases, decreases, or any other percentage calculation—Filator has you covered.