Percentage Tools
Last updated: November 14, 2026
Every calculator on this site, including the newer U.S.-focused tools, is listed below. The earlier All Free Tools address is unchanged. Each tool shows its formula and working in your browser.
Percentage Calculator
Find a percent of a number, a change, or an original value.
Percentage of a Number
What is X percent of Y.
Percentage Increase
Growth from an original value.
Percentage Decrease
A drop from an original value.
Percentage Change
Increase or decrease in one place.
Percentage Difference
Compare two values using their midpoint.
Reverse Percentage
Recover an original number after a percent.
Discount Calculator
Amount saved and a sale price.
Percentage Off
A markdown as a percent off.
Fraction to Percentage
Convert a fraction into a percent.
Percentage to Fraction
Write a percent as a fraction.
Marks Percentage
Exam marks as a percentage.
Profit Percentage
Profit or loss as a percent of cost.
Profit and Loss
Profit or loss in dollars and as a percent.
Freelance Profit
Fees after platform charges, tax, and expenses.
Stock Average Down
A new average cost after buying more shares.
GPA Calculator
Course GPA from credits and grade points.
Tip Calculator
A tip on a single bill.
Final Exam Calculator
The score needed on a final exam.
Grade Percentage Calculator
Convert points earned and points possible into a grade percentage. Example: 17 out of 20 is 85%, with 3 points remaining. Free, with the working shown.
Weighted Grade Calculator
Combine category grades and weights into one course grade. Example: 90% homework at 20%, 80% quizzes at 30%, and 70% exam at 50% is a 77% course grade.
Sales Tax Calculator
Add sales tax to a pre-tax price using the rate you enter. Example: $100 at 8.25% tax is $8.25 in tax and a $108.25 total.
Raise Calculator
Find new pay and the raise amount after a percentage increase. Example: a 3% raise on $60,000 is $1,800, for new pay of $61,800.
Markup Calculator
Find markup as a percent of cost, or build a selling price from a markup. Example: cost $50 and price $75 is a 50% markup. A 50% markup on $50 is a $75 price.
Margin Calculator
Find profit margin as a percent of selling price, or set a price from a target margin. Example: cost $50 and price $75 is a 33.33% margin. A 40% margin on a $50 cost is an $83.33 price.
Stacked Discount Calculator
Apply two or more percent-off coupons in order, then add optional sales tax. Example: 20% then 10% off $100 is a $72 sale price (28% off, not 30%). At 8% tax the total is $77.76.
Percentage Points Calculator
Convert two percentages into a change in percentage points and the relative change of the rate. Example: a move from 8% to 10% is 2 percentage points, which is a 25% relative increase of the rate.
Sale Price and Original Price Calculator
Find a sale price from an original price and a percent off, or recover the original price from a sale price. Example: $80 at 25% off is $60. An $80 sale price at 20% off came from $100.
Tip Split Calculator
Calculate a tip, optional tax, and an even split of the total. Example: an $80 pre-tax subtotal, 20% tip, and 4 people is a $16 tip and $24 per person when tax is $0.
Hourly to Salary Calculator
Convert an hourly wage to weekly, monthly, and annual pay using hours and weeks you enter (default 40 × 52 = 2,080 hours a year). A $25 wage is $52,000 a year; a 4% raise is $26 an hour, or $54,080 a year.
Inflation Calculator
Project a future value or remaining buying power from an inflation rate you enter, or scale an amount with two CPI values. Example: $100 at 3% for 2 years is $106.09. $100 scaled from CPI 200 to 240 is $120.
Percentage Error Calculator
Find absolute and signed percentage error from a measured value and an accepted value. Example: 9.8 measured against 10 is a 2% absolute error and a −2% signed error.
Average Percentage Calculator
Average two or more percentages with equal weight. Example: 80%, 90%, and 70% average to 80%. Use the weighted grade calculator if the items have different weights.
CAGR Calculator
Find the compound annual growth rate between a starting and ending value. Example: 100 to 121 over 2 years is a 10% CAGR.
Percentile Rank Calculator
Find a mid-rank percentile from a list of scores or from counts of scores below and tied. Example: in 50, 60, 70, 80, 90, a score of 70 has percentile rank 50.
Ratio to Percentage Calculator
Convert a ratio to a percentage as a part of a whole, or as shares of two parts. Example: 3 out of 4 is 75%. A 3:4 part-to-part split is about 42.86% and 57.14%.
Attendance Percentage Calculator
Find a U.S. attendance percentage, how many more classes you must attend to reach a target, or how many you can still miss. Example: 12 of 16 days is 75%. Reaching 80% from there takes 4 more attended classes.
GPA and Letter Grade Converter
Convert a percentage to a letter and GPA, or a GPA to a percentage band, on a common U.S. plus-minus scale you can edit. Scales vary by school. Example: 95% is an A (4.0) on the default scale.