All Calculators
Browse all free online calculators organized by category.
Loan Calculator
Calculate monthly payments for any loan with fixed interest rate.
Mortgage Calculator
Calculate your monthly mortgage payment based on loan amount, interest rate, and term.
Compound Interest Calculator
Calculate how your investment grows with compound interest over time.
Savings Calculator
Calculate future value of savings with regular contributions.
VAT Calculator
Calculate VAT (Value Added Tax) for any amount and tax rate.
Percentage Calculator
Calculate percentages with three different calculation modes.
Salary Calculator
Convert annual salary to monthly, weekly, daily, and hourly rates.
ROI Calculator
Calculate return on investment (ROI) for any investment.
Tip Calculator
Calculate tip amount and split the bill between multiple people.
Discount Calculator
Calculate sale price after a percentage discount.
Currency Converter
Convert between 20 major currencies with static reference rates for quick estimates.
Credit Card Payoff Calculator
Calculate payoff time and total interest for your credit card debt.
Retirement Calculator
Project retirement savings with current balance, monthly contributions, and return rate.
Inflation Calculator
See how inflation affects purchasing power from 1980 to 2024 using 3% average rate.
Break-Even Calculator
Calculate how many units to sell to cover costs. Enter fixed costs, variable costs, and price.
Net Worth Calculator
Calculate personal net worth from assets and liabilities. Private β all local.
Hourly to Salary Calculator
Convert hourly wage to annual, monthly, weekly, and daily salary equivalents.
Paycheck Calculator
Calculate net take-home pay after federal, state tax, and FICA deductions.
Rental Yield Calculator
Calculate gross and net rental yield for investment properties.
Invoice Tax Calculator
Calculate invoice total with tax and optional discount for freelancers and businesses.
Crypto Profit Calculator
Calculate crypto trading profit/loss and ROI including exchange fees.
Stock Return Calculator
Calculate total stock return including capital gains and dividends received.
Body Fat Calculator
Calculate body fat percentage using the US Navy method.
Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity level.
BMI Calculator
Calculate your Body Mass Index (BMI) and find your weight category.
Calorie Calculator
Calculate daily calorie needs based on your activity level using Harris-Benedict formula.
Pregnancy Calculator
Calculate your due date and pregnancy week from last menstrual period.
Age Calculator
Calculate your exact age in years, months, and days.
Average Calculator
Calculate mean, median, mode, sum, and count for a set of numbers.
Quadratic Equation Calculator
Solve quadratic equations axΒ²+bx+c=0 and find real or complex roots.
Fraction Calculator
Add, subtract, multiply, and divide fractions with automatic simplification.
Percentage Change Calculator
Calculate percentage increase or decrease between two values.
Volume Converter
Convert between liters, gallons, cubic meters, fluid ounces, and more.
Area Converter
Convert between square meters, square feet, acres, hectares, and more.
Speed Converter
Convert between km/h, mph, m/s, knots and other speed units.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales.
Weight Converter
Convert between kilograms, pounds, ounces, and other weight units.
Length Converter
Convert between meters, feet, inches, miles, and more length units.
Circle Area Calculator
Calculate the area and circumference of a circle using the radius.
Rectangle Area Calculator
Calculate the area and perimeter of any rectangle by entering length and width.
Triangle Area Calculator
Calculate triangle area using base and height or Heron formula with three sides.
Volume Calculator
Calculate the volume of spheres, cubes, cylinders, and cones. Select shape and enter dimensions.
Pythagorean Theorem Calculator
Solve the Pythagorean theorem by entering any two sides of a right triangle.
Cylinder Volume Calculator
Calculate the volume and lateral surface area of a cylinder using radius and height.
Sphere Volume Calculator
Calculate the volume and surface area of a sphere from its radius.
Perimeter Calculator
Calculate the perimeter of squares, rectangles, triangles, and circles.
Date Difference Calculator
Calculate the exact difference between two dates in days, weeks, months, and years.
Age in Days Calculator
Find out exactly how many days, hours, and minutes old you are from your birthdate.
Sleep Calculator
Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles.
Ovulation Calculator
Calculate ovulation date, fertile window, and next period from your cycle data.
Calorie Burn Calculator
Calculate calories burned during 15+ activities using weight, duration, and MET values.
Cooking Converter
Convert between cups, tablespoons, teaspoons, ml, liters, oz, and grams for recipes.
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, and years all at once.
Time Zone Converter
Convert time between 20 major world cities instantly for global scheduling.
GPA Calculator
Calculate your Grade Point Average from letter grades and credit hours on the 4.0 scale.
Reading Time Calculator
Calculate reading time for any text at slow, average, and fast reading speeds.
Ohms Law Calculator
Calculate voltage, current, resistance, and power β enter any two values.
Force Calculator
Calculate force in Newtons using F=ma. Also shows weight using Earths gravity.
Speed Distance Time Calculator
Calculate speed, distance, or time by entering any two values. D = S Γ T.
Kinetic Energy Calculator
Calculate kinetic energy KE = 0.5mv2 in Joules from mass and velocity.
Density Calculator
Calculate density, mass, or volume using D=M/V. Enter any two to find the third.
Binary Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly.
Color Converter
Convert colors between HEX, RGB, and HSL formats with live preview swatch.
File Size Converter
Convert file sizes between bits, bytes, KB, MB, GB, and TB instantly.
Bandwidth Calculator
Calculate download time for any file size at any connection speed in Mbps.
Aspect Ratio Calculator
Calculate aspect ratio of any image or screen and scale dimensions proportionally.