Calculate anything. Keep it simple.

Free calculators for everyday questions. Search by name or browse by category.

66 / 66

Business2 calculators

Business

Break-Even Point

Units & revenue needed to cover fixed costs.

Markup & Margin

Find profit, markup %, and margin % from cost and price

Construction & DIY5 calculators

Construction & DIY

Concrete Calculator

Volume and bag count for slabs and columns.

Drywall Calculator

Estimate drywall sheets needed for any room.

Mulch & Gravel Calculator

Volume of mulch or gravel for any area.

Paint Calculator

Estimate paint quantity for any room.

Tile Calculator

Estimate tiles needed for any floor or wall area.

Date & Time6 calculators

Date & Time

Age Calculator

Exact age from birth date to today.

Chinese Zodiac Calculator

Chinese zodiac animal from your birth date.

Date Difference

Exact time span between any two dates.

Hours Between Calculator

Hours and minutes between two times.

Year Progress Calculator

How much of the year has gone by today.

Zodiac Sign Calculator

Western zodiac sign from your birth date.

Everyday Life5 calculators

Everyday Life

Electricity Cost Calculator

Cost of running a device from watts and hours.

Fuel Efficiency

Convert fuel units and calculate trip fuel costs.

Running Pace Calculator

Compute pace, time, or distance for a run.

Split Bill

Split bills evenly among a group with tip included.

Tip Calculator

Calculate tips and split bills between people.

Financial14 calculators

Financial

CAGR Calculator

Annualized growth rate from start, end, and years.

Compound Interest

Lump-sum growth over time, with optional monthly top-ups.

DCA Investment Calculator

Future value of monthly contributions.

Debt Payoff

Time to pay off debt, total interest & months saved with extra payments.

Discount Calculator

Final price and savings from a percent-off or fixed-amount discount.

Hourly Wage to Annual Salary

Hourly rate to yearly salary, both ways.

Inflation Calculator

Past money in today's purchasing power.

Loan Calculator

General loan / car / personal — monthly payment, interest & early payoff.

Mortgage Calculator

Full PITI monthly payment in one number.

Refinance Break-Even

Months until refi savings repay closing costs.

Retirement Calculator

Estimate your retirement nest egg from current savings, contributions & returns.

ROI Calculator

ROI %, annualized rate, and payback in years.

Savings Goal

Monthly savings needed to reach your goal, accounting for returns.

VAT / Sales Tax Calculator

Add or remove VAT/sales tax — net, tax & gross breakdown.

Geometry4 calculators

Geometry

Circle Calculator

Find the area, circumference, diameter, or radius of a circle from any one value.

Pythagorean Theorem Calculator

Find the missing side of any right triangle.

Triangle Solver

Area, perimeter & angles from three sides.

Volume Calculator

Volume of five common shapes, with liquid capacity.

Health & Fitness11 calculators

Health & Fitness

BMI Calculator

Calculate your BMI from weight and height.

Body Fat Calculator

Estimate body fat % from circumference measurements

Calorie Calculator

Daily calorie target for cut, maintain, or bulk goals.

Heart Rate Zones

Find your 5 heart rate training zones

Macros Calculator

Daily P/C/F grams from your calorie target.

One-Rep Max Calculator

Estimate your 1RM from a working set.

Ovulation Calculator

Ovulation & fertile window estimator.

Pregnancy Due Date Calculator

Estimated due date from your last period.

Race Time Predictor

Predict a race time from a known performance.

Sleep Cycle Calculator

Bedtimes or wake-ups aligned to 90-minute cycles.

Water Intake

Estimate a daily water baseline

Mathematics8 calculators

Mathematics

Fraction Calculator

Add, subtract, multiply, or divide fractions

GCD & LCM

Find GCD and LCM of two numbers

Linear System Solver

Solve two simultaneous linear equations

Percentage Calculator

Three-mode percentage calculator

Prime Factorization

Find prime factors of any integer

Quadratic Equation Solver

Solve ax² + bx + c = 0 with roots and vertex

Scientific Calculator

Evaluate math expressions with advanced functions

Statistics Calculator

Mean, median, mode, std dev from a data set

Science6 calculators

Science

Density Calculator

Compute density, mass, or volume from two known values

Kinetic Energy

Compute KE = 1/2 mv² from mass and velocity

Ohm's Law

Solve for V, I, or R with Ohm's Law

Potential Energy

Compute PE = mgh from mass, gravity, and height

Projectile Motion

Compute range, max height, and flight time for projectiles

Speed, Distance & Time

Compute speed, distance, or time from two known values

Unit Conversion5 calculators

Unit Conversion

Cooking Converter

Convert cups, tablespoons, ounces and more for cooking.

Length Converter

Convert metric and imperial length units without cross-category noise.

Temperature Converter

Convert temperatures with dedicated Celsius, Fahrenheit, and Kelvin controls.

Volume Converter

Convert liters, gallons, cups, and cubic units.

Weight Converter

Convert weight and mass units with a focused metric-to-imperial tool.