All calculators
37 free tools and counting — every calculation runs in your browser.
Percentage
Percentage Calculator
Work out any percentage instantly — three calculators in one.
Percentage Increase Calculator
Add a percentage to a number, or find the percent increase between two values.
Percentage Decrease Calculator
Subtract a percentage from a number, or find the percent decrease between two values.
Percentage Difference Calculator
Find the percentage difference between two values, relative to their average.
Finance
Discount Calculator
See how much you save and what you pay after a percent-off discount.
Tip Calculator
Calculate the tip and split the total between any number of people.
Margin Calculator
Find profit, profit margin, and markup from cost and revenue.
VAT Calculator
Add or remove VAT (or sales tax) to find the net, tax, and gross amounts.
Sales Tax Calculator
Add sales tax to a price, or remove it from a total.
Compound Interest Calculator
See how savings grow with compound interest and regular contributions.
Commission Calculator
Calculate sales commission and total pay from a sale and rate.
Mortgage Calculator
Estimate your full monthly mortgage payment — PITI, PMI, and HOA.
Loan Calculator
Monthly payment, total interest, and payoff schedule for any loan.
Home Affordability Calculator
How much house can you afford? Based on the 28/36 DTI rule.
Amortization Schedule
A complete payment-by-payment breakdown for any loan.
Auto Loan Calculator
Estimate your car payment with trade-in and sales tax.
Credit Card Payoff Calculator
See how fast you'll be debt-free — and the cost of paying only the minimum.
Savings Goal Calculator
Find the monthly amount to save to hit your target on time.
Math
Average Calculator
Find the mean, median, sum, min, max, and range of a list of numbers.
GPA Calculator
Calculate your grade point average on the 4.0 scale, weighted by credits.
Fraction to Decimal Converter
Convert any fraction to a decimal (and a percentage), with the simplified form.
Random Number Generator
Generate random numbers in any range — with optional unique values.
Ratio Calculator
Simplify ratios and solve proportions (A : B = C : ?).
Standard Deviation Calculator
Find standard deviation, variance, and mean for a data set.
Percent Error Calculator
Compare a measured value to the true value as a percentage.
Unit Converter
Convert between length, weight, temperature, area, volume, speed, time, and data units instantly.
Scientific Calculator
A full scientific calculator — trig, logs, powers, factorials, and constants.
Grade Calculator
Weighted grade average, letter grade, GPA — and the score you need on the final.
Everyday
Health
Time & Date
Hours Calculator
Find the hours and minutes between times — including overnight shifts.
Date Calculator
Days between two dates, or add and subtract days from a date.
Date Difference Calculator
Days, weeks, months, and working days between two dates.
Time Zone Converter
Convert times between any two cities, with a live world clock.