Percentage Calculator

Percentage calculators handle every kind of percent question — percent of a number, percent change and difference, increases and decreases, and conversions between percentages, grades, and degrees. Popular tools include the Percentage Calculator, Percent Change Calculator, Percentage Increase Calculator, Percentage Growth Calculator, and Percentage Deviation Calculator.

Pick the exact percentage task below for an instant, worked answer, or open the Trending tab to see what's in demand this week. Everything is free and works on any device.

  • Is-Of Percentage Proportion Calculator
    Solve the percentage proportion is/of = %/100 for any missing value. Enter any two of is, of, or percent and get the third instantly.
  • New Value After Percent Change Calculator
    Find the new value after applying a percent increase or decrease to an original number. Enter the old value and percent change to get the result instantly.
  • Percent Off Calculator
    Find the discount percentage from an original price and a sale price. Instantly see the percent off and the amount you saved.
  • Percent Proportion Solver for X
    Solve the percent proportion part/whole = percent/100 for any unknown. Find the part, the whole, or the percent instantly with steps.
  • Markup Calculator
    Free markup calculator: enter cost and markup percentage to find selling price, profit, and profit margin instantly. Simple cost-to-price formula.
  • Percent Tip Calculator
    Calculate the tip and total from any bill amount and tip percentage. Split the bill between people for a clean per-person amount.
  • Sales Tax Calculator
    Calculate sales tax and total price instantly. Enter a price and tax rate (%) to get the tax amount and final total. Free, fast, and accurate.
  • Three Variable Percent Equation Solver
    Solve the percent proportion part/whole = percent/100 for any unknown. Enter two values, pick what to solve for, and get the part, whole, or percent instantly.
  • Decrease a Number by a Percent Calculator
    Subtract a percentage from any number instantly. Enter a starting number and a percent to get the reduced value, plus the exact amount of decrease.
  • Percent Change Between Two Values Calculator
    Find the percent change between an original and new value instantly. Calculate percent increase or decrease with the simple (new-old)/|old| x 100 formula.
  • Discount Calculator
    Free discount calculator: enter an original price and percent off to instantly find the sale price and how much money you save.
  • Stock Price Percent Gain/Loss Calculator
    Calculate the percentage gain or loss on a stock from its buy and sell price. Get profit per share and total profit instantly. Free and universal.
  • GST Percentage Calculator
    Free GST calculator to add or remove GST at any percentage. Enter an amount and rate to get the net price, GST amount, and gross total instantly.
  • Sales Tax Backed Out of Total Calculator
    Back out the sales tax from a tax-inclusive total. Enter the gross amount and tax rate to find the net price and the tax included.
  • 30 Percent Off Calculator
    Calculate 30% off any price instantly. Enter the original price to see the discounted sale price and the exact amount you save.
  • Percent Grade to Degrees Calculator
    Convert a percent grade (slope) into degrees instantly. Enter the grade % to get the slope angle in degrees and radians using arctangent.
  • Target Heart Rate Zone Percentage Calculator
    Calculate your target heart rate at any exercise intensity percentage using your age and the 220-minus-age maximum heart rate formula.
  • Alcohol Proof to Percentage (ABV) Calculator
    Convert US alcohol proof to percentage alcohol by volume (ABV) instantly. Just divide proof by 2 — enter the proof to get the exact ABV percentage.
  • 15 Percent Tip Calculator
    Calculate a 15% tip and total bill instantly. Enter your bill amount, optionally split between people, and see the tip and total per person.
  • 20 Percent Off Calculator
    Calculate 20% off any price instantly. Enter the original price to see the sale price and how much money you save with a 20 percent discount.
  • 50% Off Calculator
    Calculate 50 percent off any price instantly. Enter the original price to see the half-off sale price and how much money you save.
  • Two-Thirds (2/3) as a Percentage Calculator
    Convert any fraction or part-out-of-number into a percentage instantly. Enter numerator and denominator to get the percent and decimal value.
  • Win Rate Calculator
    Calculate your win rate percentage from wins and games played. Free win rate calculator for esports, sports, gaming and matches with instant results.
  • Grade Percentage Needed Calculator
    Find the average score you need on the remaining work to hit your target final grade, based on your current grade and weight completed.

Frequently asked questions

What percentage problems can I solve here?

What is X% of Y, what percent is X of Y, percent increase or decrease, percent change and difference, percentage growth over time, and conversions such as percent grade to degrees.

What's the difference between percent change and percentage points?

Percent change is relative to the starting value, while percentage points are a simple difference between two percentages. Choose the tool that matches which one you need.

Are these calculators free?

Yes — free, no sign-up, and they work on any device.

Do they show the formula?

Yes — most show the calculation so you can see how the percentage was worked out, not just the final number.

Which percentage tools are most popular?

The list is ordered by usage; the Trending, Recently added, and Last updated tabs show what's new and rising.

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