All Calculators

Mortgage Calculator

Calculate your monthly mortgage payment, total interest, and amortization schedule.

Loan Calculator

Estimate monthly payments and total cost for any personal or auto loan.

Compound Interest Calculator

See how your investments grow with the power of compound interest.

Investment Calculator

Project future value of investments with regular contributions.

Savings Calculator

Plan your savings goals with deposit and interest projections.

Retirement Calculator

Estimate how much you need to retire comfortably.

Refinance Calculator

Compare your current mortgage to a refinanced loan.

Home Affordability Calculator

Find out how much house you can afford based on your income.

HELOC Calculator

Calculate payments on a home equity line of credit.

Sales Tax Calculator

Quickly compute sales tax for any purchase amount and rate.

APR Calculator

Calculate the annual percentage rate on loans and credit cards.

ROI Calculator

Measure the return on investment for any project or asset.

Paycheck

8 tools

Paycheck Calculator

Estimate your take-home pay after federal, state, and local taxes.

Salary Calculator

Convert between hourly, weekly, monthly, and annual salary figures.

Hourly to Salary Calculator

Convert your hourly wage to an equivalent annual salary.

Overtime Calculator

Calculate overtime pay based on hours worked and pay rate.

Time Card Calculator

Track work hours and calculate total pay for any pay period.

Federal Tax Calculator

Estimate your federal income tax based on taxable income.

Self-Employment Tax Calculator

Calculate SE tax and estimated quarterly payments for freelancers.

Take-Home Pay Calculator

See your net pay after all deductions and withholdings.

Health

15 tools

BMI Calculator

Calculate your Body Mass Index and interpret your weight category.

Calorie Calculator

Find out how many calories you need daily to reach your goals.

BMR Calculator

Calculate your Basal Metabolic Rate to understand energy at rest.

Body Fat Calculator

Estimate your body fat percentage using measurements.

TDEE Calculator

Total Daily Energy Expenditure based on activity level.

Macro Calculator

Calculate optimal protein, carb, and fat intake for your goals.

Ideal Weight Calculator

Find your ideal body weight based on height and frame.

Pregnancy Due Date Calculator

Estimate your baby's due date from last period or conception.

Ovulation Calculator

Predict your ovulation and fertile window.

Water Intake Calculator

Calculate your recommended daily water intake.

Sleep Calculator

Find the best times to sleep or wake up based on sleep cycles.

Heart Rate Calculator

Calculate target heart rate zones for training.

Pace Calculator

Calculate running pace, speed, or finish time for any distance.

One Rep Max Calculator

Estimate your maximum lift weight from training sets.

Protein Calculator

Find out how much protein you need daily based on your goals.

Education

8 tools

Grade Calculator

Calculate your weighted course grade from assignment scores.

GPA Calculator

Calculate your GPA on a 4.0 scale from course grades and credits.

Final Grade Calculator

Find out what score you need on your final exam to get your target grade.

Test Grade Calculator

Convert raw scores to letter grades and percentages.

College GPA Calculator

Track and calculate cumulative college GPA across multiple semesters.

Weighted Grade Calculator

Calculate your grade when assignments have different weights.

Attendance Calculator

Calculate your class attendance percentage.

Study Time Calculator

Plan optimal study sessions with the Pomodoro and spaced repetition techniques.

Math

24 tools

Percentage Calculator

Calculate percentages, percent change, and percent of a number.

Fraction Calculator

Add, subtract, multiply, and divide fractions instantly.

Ratio Calculator

Simplify ratios and solve ratio equations step by step.

Discount Calculator

Calculate final price after any discount percentage.

Margin Calculator

Calculate profit margin and markup for products and services.

Square Root Calculator

Find the square root or nth root of any number.

Exponent Calculator

Calculate powers and exponents for any base and exponent.

Logarithm Calculator

Compute natural log, base-10 log, or any custom base.

Scientific Calculator

Full-featured scientific calculator for complex calculations.

Triangle Calculator

Solve triangles — find missing sides, angles, and area.

Area Calculator

Calculate area of circles, rectangles, triangles, and more.

Volume Calculator

Find volume of 3D shapes including spheres, cylinders, and boxes.

Pythagorean Theorem Calculator

Solve for any side of a right triangle using the Pythagorean theorem.

Greatest Common Factor

Find the greatest common factor of two or more numbers.

Least Common Multiple

Calculate the least common multiple for any set of numbers.

Prime Factorization

Break down any number into its prime factors.

Random Number Generator

Generate random numbers within any range instantly.

Average Calculator

Calculate mean, median, mode, and range for any dataset.

Standard Deviation Calculator

Compute standard deviation and variance for statistical data.

Quadratic Formula Calculator

Solve quadratic equations using the quadratic formula.

Unit Converter

Convert between units of length, weight, temperature, volume, and more.

Currency Converter

Convert between world currencies at current exchange rates.

Binary Calculator

Add, subtract, and convert binary, decimal, octal, and hexadecimal.

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers.

Date & Time

6 tools

Age Calculator

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

Date Calculator

Add or subtract days from a date and find the difference between dates.

Time Calculator

Add, subtract, and convert hours, minutes, and seconds.

Birthday Calculator

Find out how many days until your next birthday and other fun facts.

Days Between Dates

Calculate the exact number of days between any two dates.