Calculate Anything. Instantly.
Not just one calculator — a full suite for students, teachers, business users, shoppers, investors, and everyday math. Live results, formulas, step-by-step solutions, and shareable URLs.
Popular calculators
Start with the most-used percentage tools.
What is X% of Y?
Instantly calculate what percent of a number is. Enter X and Y to find X% of Y with formula, steps, and examples.
X is What Percent of Y?
Find what percentage one number is of another. Calculate “25 is what percent of 200?” with live steps and formula.
A is What Percent More/Less Than B?
Find how much percent more or less one number is than another. Example: 120 is 20% more than 100.
Percentage of a Percentage
Calculate one percentage of another. Example: 20% of 50% = 10%. Shows the result as a percentage and a decimal.
Tip Calculator
Calculate tip amount, total bill, and per-person share from bill amount, tip percentage, and optional party size.
Percentage Increase
Calculate percentage increase between two numbers. Example: 100 to 130 is a 30% increase.
Discount Calculator
Calculate final price and savings from an original price and discount percentage.
GST Calculator
Calculate GST amount and price with or without GST for any rate (5%, 12%, 18%, 28%).
Marks Percentage
Calculate exam marks percentage from obtained and total marks.
Profit Percentage
Calculate profit percentage from cost and selling price.
ROI Percentage
Calculate return on investment percentage from gain and cost.
Percentage Change
Calculate percentage change between any two values. Positive means increase, negative means decrease.
Browse by category
From basic math to finance, health, marketing, and more.
Basic Calculators
Core percentage formulas — find a percent of a number, convert fractions, ratios, and decimals.
11 calculatorsPercentage Change
Measure increase, decrease, difference, error, and relative change between values.
7 calculatorsIncrease & Decrease
Apply percentage increases, decreases, successive changes, and compound adjustments.
6 calculatorsReverse Percentage
Work backwards from a final amount to find the original price, salary, or base.
6 calculatorsMarks & Grades
Marks percentage, CGPA conversion, attendance, required marks, and grade calculators.
9 calculatorsShopping
Discounts, coupons, cashback, BOGO deals, and multi-offer savings calculators.
11 calculatorsBusiness
Profit, loss, margin, markup, commission, sales growth, and target achievement.
10 calculatorsFinance
ROI, interest, inflation, salary hike, GST, VAT, capital gains, and loan percentages.
9 calculatorsGST / VAT
Add or remove GST and VAT, calculate tax amounts, and reverse tax-inclusive prices.
4 calculatorsStatistics
Distributions, weighted averages, survey results, sample percentages, and probability.
6 calculatorsHealth
Body fat, macros, calorie splits, weight change, water intake, and BMI tools.
7 calculatorsElection & Polls
Vote share, seat percentage, majority thresholds, and poll result calculators.
3 calculatorsSports
Win percentage, strike rate, possession, success rate, and completion percentage.
5 calculatorsConstruction
Material wastage, project completion, and cost increase percentage calculators.
3 calculatorsManufacturing
Yield, efficiency, defect rate, scrap percentage, and machine utilization.
5 calculatorsSEO & Marketing
CTR, conversion rate, bounce rate, growth, and email open rate calculators.
5 calculatorsSocial Media
Follower growth, engagement rate, reach, and content completion percentages.
4 calculatorsWhy CalcApp?
Live calculation
Results update as you type — no submit lag.
Learn, don’t just compute
Every tool shows the formula, steps, and a plain-English explanation.
Shareable links
Copy a URL with your inputs pre-filled for classmates or coworkers.
Zero login
History and favorites stay on your device. Private by default.