Percentage Calculators
Every percentage problem you'll meet at school, at work or while shopping — each calculator shows the formula and the steps.
Percentage Increase CalculatorFree percentage increase calculator: enter an original and a new value to get the % increase, the change and the multiplier, with the formula shown step by step.Percentage Off CalculatorEnter a price and the percent off to see the sale price and how much you save, with optional sales tax. Also find the discount percentage from two prices.Weight Loss Percentage CalculatorFind the percentage of body weight you've lost from your starting and current weight, plus your 5% and 10% milestone weights. Works in pounds or kilograms.Percentage Change Between Two NumbersCalculate the percentage change between two numbers, whether it's an increase or a decrease, plus the symmetric percent difference. Formula and example included.Calculate Online PercentageCalculate any percentage online: X% of Y, X is what percent of Y, X is P% of what, and percent change — four free calculators on one page with steps.How to Find a Percent of a NumberLearn how to find a percent of a number with a free calculator, the decimal method, the fraction method and the 10% mental-math trick, with worked examples.Is Percent of What CalculatorSolve “X is P percent of what number?” instantly. Find the whole (the original total) when you know a part and its percentage, with the formula and examples.Reduction Percentage CalculatorCalculate the percentage reduction (percent decrease) from an original value to a lower value — costs, prices, energy use, errors — with formula and example.X Is What Percent of Y?Find what percent X is of Y — test scores like 18 out of 24, 11 out of 15 or 12/20 — with a free calculator, formula and a quick score-to-percent table.Percentage Error CalculatorCalculate percent error between a measured (experimental) value and the accepted (theoretical) value for lab reports, with absolute and signed error and formula.How to Calculate Average PercentageAverage a list of percentages the right way. Get the simple mean and the weighted average by sample size, with a step-by-step explanation of when to use each.Salary Increase Percentage CalculatorCalculate your raise as a percentage from old and new salary, or your new salary from a raise percentage, with monthly, biweekly and hourly equivalents.Percent to Goal CalculatorTrack percent to goal for sales quotas, fundraising and savings. See progress %, the amount remaining, your pace versus time elapsed and a projected finish.Reverse Percentage CalculatorWork backwards from a final value to the original before a percentage increase or decrease — prices before tax, salary before a raise, cost before a discount.How to Calculate Markup PercentageCalculate markup percentage from cost and price, see the matching profit margin, or set a selling price from a target markup. Clear formulas and examples.Gradient to Percentage CalculatorConvert a gradient (rise over run) or an angle into percent slope, degrees and a 1:x ratio — for roads, ramps, roofs, driveways and drainage.