All Calculators

Percentage Calculator

Calculate percentages, percentage change, and find what percent one number is of another.

Math

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step solutions.

Math

Scientific Calculator

Full-featured scientific calculator with trig, logarithms, exponents and more.

Math

Square Root Calculator

Calculate the square root, cube root, and nth root of any number.

Math

Exponent Calculator

Calculate any base raised to any power, including negative and fractional exponents.

Math

Quadratic Formula Calculator

Solve ax²+bx+c=0 instantly with discriminant and both roots shown.

Math

GCF & LCM Calculator

Find the Greatest Common Factor and Least Common Multiple of any numbers.

Math

Prime Factorization Calculator

Find all prime factors of any number with factor tree and exponential notation.

Math

Average Calculator

Calculate mean, median, mode, and range of any data set.

Math

Standard Deviation Calculator

Calculate population and sample standard deviation and variance.

Math

Pythagorean Theorem Calculator

Find any side of a right triangle using a²+b²=c².

Math

Triangle Calculator

Solve any triangle: find sides, angles, and area using SSS, SAS, or AAS.

Math

Ratio Calculator

Simplify ratios and solve proportions easily.

Math

Logarithm Calculator

Calculate log base 10, natural log (ln), and any base logarithm.

Math

Combinations Calculator

Calculate nCr combinations and nPr permutations for probability.

Math

Decimal to Fraction

Convert any decimal to a simplified fraction or mixed number.

Math

Long Division Calculator

Perform long division with full step-by-step work shown.

Math

Matrix Calculator

Add, multiply, find determinant and inverse of matrices.

Math

Algebra Calculator

Solve linear equations, quadratic equations and expressions step by step.

Math

Rounding Calculator

Round numbers to any decimal place or significant figures.

Math

Absolute Value Calculator

Find the absolute value of any number or expression.

Math

Roman Numeral Converter

Convert between Roman numerals and standard numbers.

Math

Binary Calculator

Convert between binary, decimal, hexadecimal and octal number systems.

Math

Factor Calculator

Find all factors of any number quickly.

Math

Percentage Increase Calculator

Calculate the percentage increase or decrease between two values.

Math

Slope Calculator

Calculate the slope, angle, and equation of a line between two points.

Math

Distance Formula Calculator

Calculate the distance between two points in 2D or 3D space.

Math

Midpoint Calculator

Find the midpoint between two coordinate points.

Math

Circle Calculator

Calculate area, circumference, diameter and radius of a circle.

Math

Rectangle Calculator

Calculate area, perimeter and diagonal of a rectangle.

Math

Sphere Calculator

Calculate volume, surface area and diameter of a sphere.

Math

Cylinder Calculator

Calculate volume and surface area of a cylinder.

Math

Cone Calculator

Calculate volume, surface area and slant height of a cone.

Math

Mean Median Mode Calculator

Calculate mean, median, mode and range for statistical data.

Math

Z-Score Calculator

Calculate the z-score (standard score) for any value in a distribution.

Math

Probability Calculator

Calculate the probability of single and combined events.

Math

Sequence Calculator

Calculate terms and sums of arithmetic and geometric sequences.

Math

Polynomial Calculator

Add, subtract and multiply polynomial expressions.

Math

Slope Intercept Form Calculator

Convert between slope-intercept, standard and point-slope line forms.

Math

Distance Speed Calculator

Calculate unit rates and compare prices per unit.

Math

Percent Error Calculator

Calculate the percent error between experimental and true values.

Math

Number Sorter

Sort a list of numbers in ascending or descending order.

Math

Trigonometry Calculator

Calculate sine, cosine, tangent and inverse trig functions.

Math

Mixed Number Calculator

Add, subtract, multiply and divide mixed numbers.

Math

Loan Calculator

Calculate monthly payments, total interest and full amortization schedule.

Finance

Mortgage Calculator

Calculate monthly mortgage payments including principal, interest, taxes and insurance.

Finance

Compound Interest Calculator

See how money grows with daily, monthly or annual compounding.

Finance

Tip Calculator

Calculate tip amount and split the bill among any number of people.

Finance

Paycheck Calculator

Estimate your take-home pay after taxes and deductions.

Finance

Investment Calculator

Project the future value of investments with regular contributions.

Finance

ROI Calculator

Calculate return on investment and annualized CAGR.

Finance

Salary Calculator

Convert annual salary to hourly, weekly and monthly pay.

Finance

Tax Calculator

Estimate federal income tax liability and effective tax rate.

Finance

Savings Goal Calculator

Find how long to reach your savings target or required monthly amount.

Finance

Credit Card Payoff Calculator

Calculate payoff time and total interest for credit card debt.

Finance

Retirement Calculator

Estimate your retirement savings and check if you are on track.

Finance

Break-Even Calculator

Calculate the break-even point in units and revenue for any business.

Finance

Simple Interest Calculator

Calculate simple interest using I=PRT formula.

Finance

Currency Converter

Convert between world currencies with exchange rate formulas.

Finance

Auto Loan Calculator

Calculate monthly car payments and total cost of auto financing.

Finance

APR Calculator

Calculate the Annual Percentage Rate for any loan.

Finance

Debt-to-Income Calculator

Calculate your debt-to-income ratio for mortgage qualification.

Finance

Net Worth Calculator

Calculate your total net worth from assets and liabilities.

Finance

Inflation Calculator

Calculate the inflation-adjusted value of money over time.

Finance

CD Calculator

Calculate earnings on a Certificate of Deposit.

Finance

Sales Tax Calculator

Calculate sales tax and final price for any purchase.

Finance

Budget Calculator

Build a monthly budget and track income vs expenses.

Finance

Hourly to Salary Calculator

Convert hourly wage to annual salary and compare compensation.

Finance

Refinance Calculator

Determine if refinancing your mortgage will save money.

Finance

Stock Return Calculator

Calculate stock investment returns including dividends.

Finance

Rent vs Buy Calculator

Compare the financial impact of renting versus buying a home.

Finance

House Affordability Calculator

Calculate how much house you can afford based on income and debts.

Finance

Down Payment Calculator

Calculate the down payment needed and resulting loan amount.

Finance

Annuity Calculator

Calculate the future or present value of an annuity.

Finance

Present Value Calculator

Calculate the present value of a future sum of money.

Finance

Future Value Calculator

Calculate the future value of an investment with compound interest.

Finance

Loan Payoff Calculator

Calculate how extra payments reduce loan term and interest.

Finance

Rule of 72 Calculator

Estimate how long it takes to double your money.

Finance

Margin Calculator

Calculate profit margin, markup and gross profit.

Finance

Markup Calculator

Calculate selling price from cost and desired markup percentage.

Finance

VAT Calculator

Calculate VAT amount and price including or excluding VAT.

Finance

Payroll Tax Calculator

Estimate payroll taxes including Social Security and Medicare.

Finance

401k Calculator

Project your 401(k) balance at retirement with employer match.

Finance

Emergency Fund Calculator

Calculate how much you need in an emergency fund.

Finance

Freelance Rate Calculator

Calculate your ideal freelance hourly rate based on income goals.

Finance

Loan Comparison Calculator

Compare two loan offers side by side.

Finance

BMI Calculator

Calculate your Body Mass Index and understand what it means for your health.

Health

Calorie Calculator

Find your daily calorie needs based on age, gender, weight, height and activity.

Health

Body Fat Calculator

Estimate body fat percentage using the US Navy method.

Health

Ideal Weight Calculator

Find your ideal weight range based on height and frame size.

Health

Macro Calculator

Calculate daily protein, carbohydrate and fat targets for your goals.

Health

Pace Calculator

Calculate running pace, finish time and distance for any race.

Health

Pregnancy Due Date Calculator

Calculate estimated due date from last menstrual period or conception.

Health

Calorie Burn Calculator

Estimate calories burned during 50+ exercises and activities.

Health

Water Intake Calculator

Calculate recommended daily water intake based on weight and activity.

Health

Sleep Calculator

Find optimal bedtime and wake-up times based on 90-minute sleep cycles.

Health

Heart Rate Calculator

Calculate maximum heart rate and target heart rate zones.

Health

Ovulation Calculator

Estimate ovulation date and fertile window from menstrual cycle.

Health

Protein Calculator

Find your daily protein requirement based on weight and activity level.

Health

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess health risk.

Health

One Rep Max Calculator

Estimate your one-repetition maximum for any weightlifting exercise.

Health

BMR Calculator

Calculate your Basal Metabolic Rate using multiple formulas.

Health

Body Frame Size Calculator

Determine your body frame size from wrist circumference.

Health

Lean Body Mass Calculator

Calculate lean body mass from weight and body fat percentage.

Health

Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on pre-pregnancy BMI.

Health

Child Growth Percentile Calculator

Calculate height and weight percentiles for children.

Health

Body Surface Area Calculator

Calculate body surface area used in medical dosing.

Health

Smoking Cost Calculator

Calculate the financial cost of smoking over time.

Health

Alcohol Calorie Calculator

Calculate calories in alcoholic beverages.

Health

Steps to Calories Calculator

Convert daily step count to calories burned.

Health

VO2 Max Calculator

Estimate your VO2 max from running performance.

Health

Target Heart Rate Calculator

Calculate target heart rate zones for cardio training.

Health

Ohms Law Calculator

Calculate voltage, current, resistance and power using V=IR.

Science

Speed Distance Time Calculator

Calculate speed, distance or time when you know two values.

Science

Density Calculator

Calculate density, mass or volume using D=M/V.

Science

Half Life Calculator

Calculate radioactive decay, remaining quantity and elapsed time.

Science

Molar Mass Calculator

Calculate the molecular weight of any chemical compound.

Science

Force Calculator

Calculate force, mass or acceleration using Newton second law F=ma.

Science

Kinetic Energy Calculator

Calculate kinetic energy using KE=½mv².

Science

Gravitational Force Calculator

Calculate gravitational force between two masses.

Science

Wavelength Frequency Calculator

Convert between wavelength, frequency and wave speed.

Science

Pressure Calculator

Calculate pressure, force or area using P=F/A.

Science

Power Calculator (Physics)

Calculate power, work or time using P=W/t.

Science

pH Calculator

Calculate pH from hydrogen ion concentration and vice versa.

Science

Percent Yield Calculator

Calculate percent yield for chemistry reactions.

Science

Free Fall Calculator

Calculate fall time, velocity and distance under gravity.

Science

Projectile Motion Calculator

Calculate range, height and time of flight for projectile motion.

Science

Voltage Divider Calculator

Calculate output voltage in a resistor voltage divider circuit.

Science

Capacitor Calculator

Calculate capacitance, charge, and energy stored in a capacitor.

Science

Resistor Color Code Calculator

Decode resistor values from color bands.

Science

Wind Chill Calculator

Calculate the wind chill temperature from air temperature and wind speed.

Science

Heat Index Calculator

Calculate the heat index from temperature and humidity.

Science

Dew Point Calculator

Calculate dew point from temperature and relative humidity.

Science

Mole Calculator

Convert between moles, mass and number of particles.

Science

Molarity Calculator

Calculate molarity, moles and volume for solutions.

Science

Significant Figures Calculator

Round numbers to a specific number of significant figures.

Science

Ideal Gas Law Calculator

Calculate pressure, volume, temperature or moles using PV=nRT.

Science

Age Calculator

Calculate exact age in years, months, days and hours from any birthdate.

Date & Time

Date Calculator

Find days between two dates or add/subtract time from a date.

Date & Time

Time Calculator

Add and subtract time values in hours, minutes and seconds.

Date & Time

Days Until Calculator

Count down days until any future date or event.

Date & Time

Business Days Calculator

Count working days between dates, excluding weekends and holidays.

Date & Time

Zodiac Sign Calculator

Find your Western and Chinese zodiac signs from your birth date.

Date & Time

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Date & Time

Time Zone Converter

Convert times between any two time zones around the world.

Date & Time

Week Number Calculator

Find the ISO week number for any date.

Date & Time

Countdown Timer

Create a countdown timer to any date and time.

Date & Time

Leap Year Calculator

Check if a year is a leap year and find the next leap years.

Date & Time

Anniversary Calculator

Calculate years, months and days until your next anniversary.

Date & Time

Length Converter

Convert between meters, feet, inches, miles, kilometers and more.

Conversion

Weight Converter

Convert between kilograms, pounds, ounces, grams and stones.

Conversion

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine.

Conversion

Volume Converter

Convert between liters, gallons, cups, fluid ounces and more.

Conversion

Speed Converter

Convert between mph, km/h, m/s, knots and Mach number.

Conversion

Area Converter

Convert between square feet, square meters, acres and hectares.

Conversion

Pressure Converter

Convert between Pascal, PSI, bar, atm and mmHg.

Conversion

Energy Converter

Convert between joules, calories, BTU, kWh and more.

Conversion

Data Storage Converter

Convert between bytes, KB, MB, GB, TB and more.

Conversion

Fuel Economy Converter

Convert between MPG, L/100km, and km/L fuel efficiency units.

Conversion

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

Conversion

Cooking Converter

Convert cooking measurements: cups, tablespoons, teaspoons and grams.

Conversion

Shoe Size Converter

Convert shoe sizes between US, UK, EU and CM.

Conversion

Clothing Size Converter

Convert clothing sizes between US, UK, EU and international.

Conversion

Angle Converter

Convert between degrees, radians, gradians and turns.

Conversion

Power Converter

Convert between watts, horsepower, kW and BTU/hr.

Conversion

Torque Converter

Convert between Newton-meters, foot-pounds and inch-pounds.

Conversion

Time Duration Converter

Convert between seconds, minutes, hours, days, weeks and years.

Conversion

Concrete Calculator

Calculate cubic yards and bags of concrete needed for any project.

Construction

Roofing Calculator

Calculate roofing squares and shingles needed for any roof.

Construction

Flooring Calculator

Calculate flooring material needed for any room with waste factor.

Construction

Paint Calculator

Calculate gallons of paint needed for walls, ceilings and trim.

Construction

Deck Calculator

Calculate lumber, decking boards and fasteners for a deck project.

Construction

Fence Calculator

Calculate fencing materials: posts, rails and boards for any yard.

Construction

Stair Calculator

Calculate stair rise, run, number of steps and total stringer length.

Construction

Gravel Calculator

Calculate cubic yards and tons of gravel, sand or topsoil needed.

Construction

Brick Calculator

Calculate how many bricks or blocks you need for a wall.

Construction

Drywall Calculator

Calculate sheets of drywall needed for walls and ceilings.

Construction

Insulation Calculator

Calculate insulation R-value and material needed.

Construction

Tile Calculator

Calculate number of tiles needed for any floor or wall area.

Construction

Wallpaper Calculator

Calculate rolls of wallpaper needed for any room.

Construction

Mulch Calculator

Calculate cubic yards of mulch needed for garden beds.

Construction

Asphalt Calculator

Calculate tons of asphalt needed for driveways and roads.

Construction

Tip Calculator

Calculate tip and split the bill among any number of people.

Everyday Life

Gas Mileage Calculator

Calculate fuel economy in MPG or L/100km and estimate fuel costs.

Everyday Life

Discount Calculator

Find sale price, savings amount and original price from any discount.

Everyday Life

Cooking Measurement Converter

Convert cups, tablespoons, teaspoons, grams and ounces for recipes.

Everyday Life

Calories in Food

Look up calorie and nutrition information for common foods.

Everyday Life

Grade Calculator

Calculate your course grade from assignments and weighted categories.

Everyday Life

GPA Calculator

Calculate your GPA from course grades and credit hours.

Everyday Life

Electricity Cost Calculator

Estimate the electricity cost of any appliance or device.

Everyday Life

Bra Size Calculator

Calculate your bra size from band and bust measurements.

Everyday Life

Ring Size Calculator

Find your ring size from finger circumference or diameter.

Everyday Life

Love Calculator

Fun love compatibility score calculator.

Everyday Life

Lottery Odds Calculator

Calculate the odds of winning any lottery game.

Everyday Life

Dog Age Calculator

Convert your dog age to human years and find life stage.

Everyday Life

Random Number Generator

Generate random numbers in any range, with or without repeats.

Everyday Life

Word Counter

Count words, characters, sentences and paragraphs in text.

Everyday Life

Typing Speed Calculator

Calculate words per minute (WPM) typing speed.

Everyday Life

Tank Volume Calculator

Calculate the volume of rectangular and cylindrical tanks.

Everyday Life

Paper Size Calculator

Reference for standard paper sizes (A4, Letter, Legal etc).

Everyday Life

Age in Dog Years

Convert your age to dog years for fun.

Everyday Life

Christmas Countdown

Count down the days until Christmas.

Everyday Life

Movie Time Calculator

Calculate end time when a movie starts and runs for a given duration.

Everyday Life