All Calculators
Browse our full library of free online calculators.
Conversion
Area Converter
Convert between square feet, square meters, acres, hectares, and more instantly.
Length Converter
Convert between miles, kilometers, feet, meters, inches, yards, and more instantly.
Temperature Converter
Convert between Fahrenheit, Celsius, and Kelvin
Volume Converter
Convert between gallons, liters, cups, milliliters, fluid ounces, and more instantly.
Weight Converter
Convert between pounds, kilograms, ounces, grams, stone, metric tons, and more instantly.
Finance
Barista FIRE Calculator
Most Barista FIRE calculators make you guess a semi-retirement age. This one finds it for you. Enter your numbers and see exactly when part-time income plus your portfolio cover your spending.
Coast FIRE Calculator
Most FIRE calculators tell you when you're done. This one finds the age you can stop contributing and let compound growth do the rest. Enter your target retirement age and see exactly when you can coast.
Compound Interest Calculator
See how your savings and investments grow over time with the power of compound interest and regular contributions.
FIRE Calculator
Find your financial independence number, see how many years until you can retire early, and track your progress year by year.
Loan Payment Calculator
Calculate your monthly payment and view a complete amortization schedule for any fixed-rate loan.
Long-Term Rental Calculator
See a rental's cash flow, cap rate, cash-on-cash return, and IRR over your full holding period, including utilities and every operating cost.
Mortgage Calculator
Estimate your monthly mortgage payment with a complete breakdown of principal, interest, taxes, insurance, PMI, and HOA.
Mortgage Payoff Calculator
See how extra payments can help you pay off your mortgage faster and save thousands in interest.
Retirement Drawdown Calculator
Will your money last? Enter your portfolio, planned withdrawals, and any pension or other income to see exactly how long your retirement savings hold out.
Savings Goal Calculator
Calculate how much you need to save each month to reach your financial goal on time.
Short-Term Rental Calculator
See a vacation rental's cash flow, cap rate, cash-on-cash, and IRR across your holding period, from nightly rate and occupancy through platform fees, cleaning, and furnishing.
Science
Health
Blood Pressure Calculator
Enter your systolic and diastolic readings to classify your blood pressure under AHA/ACC 2017 or ESC/ESH 2018 guidelines and compute Pulse Pressure and Mean Arterial Pressure.
BMI Calculator
Calculate your BMI in imperial or metric units, see your WHO weight category, and find the healthy weight range for your height.
BMR Calculator
Estimate your Basal Metabolic Rate (BMR) and daily calories (TDEE) from your age, sex, height, weight, and activity level. Works for adults, teens, and kids, with a choice of formula for adults.
Math
Capsule Volume Calculator
Calculate the volume of a capsule (cylinder with hemispherical caps)
Circle Calculator
Find radius, diameter, area, and circumference from any one circle measurement
Cone Calculator
Volume, surface area, and slant height from radius and height
Cube Calculator
Volume, surface area, and diagonals from the side length
Cuboid Volume Calculator
Calculate the volume of a cuboid (rectangular prism)
Cylinder Volume Calculator
Calculate the volume of a cylinder from its radius and height
Ellipse Area Calculator
Calculate the area of an ellipse
Ellipsoid Volume Calculator
Calculate the volume of an ellipsoid from its three semi-axes
Hemisphere Calculator
Find radius, diameter, base area, surface area, and volume from any one hemisphere measurement
Mean, Median, Mode Calculator
Enter a set of numbers to compute descriptive statistics and visualize data with a box-and-whisker plot
Parallelogram Area Calculator
Calculate the area of a parallelogram
Prism Volume Calculator
Calculate the volume of a triangular prism
Pyramid Calculator
Find the volume, surface area, slant height, and lateral edge of a regular pyramid with any number of sides
Pythagorean Theorem Calculator
Enter any two sides and the calculator finds the third
Rectangle Calculator
Find area, perimeter, and diagonal of a rectangle
Sector Calculator
Find all sector properties from any two known values
Slope Calculator
Enter two coordinate points to find the slope of a line and related properties
Sphere Calculator
Find radius, diameter, volume, surface area, and circumference from any one sphere measurement
Trapezoid Calculator
Find area, midsegment, and perimeter of a trapezoid
Triangle Calculator
Find triangle area using three sides, base & height, two sides & angle (SAS), or two angles & a side (AAS)
Tube Volume Calculator
Calculate the volume of a hollow cylinder (pipe or tube)
Everyday
Final Grade Calculator
Find out what you need to score on your final to reach your target overall grade.
GPA Calculator
Enter each course's letter grade and credit hours to see your GPA on the standard 4.0 scale.
Percent Off Calculator
Enter any two of original price, percent off, final price, or amount saved, and this calculator solves the other two.
Percentage Calculator
Calculate percentages instantly across three modes: find X% of Y, determine what percent X is of Y, or compute percentage change.
Tip Calculator & Bill Splitter
Calculate the tip and split the bill evenly. See exactly what each person owes.
Tip Pooling Calculator
Split a shared tip pool among your staff evenly, by hours worked, or by role points. Every share adds up to the penny.
Weighted Grade Calculator
Enter each category's grade and weight to see your overall grade and letter grade.