All calculators

Estimate your monthly mortgage payment, total interest, and full amortization schedule with a visual chart.

Calculate monthly payments and total interest for any fixed-rate amortizing loan — auto, personal, or student.

See how your savings and investments grow with compound interest, including periodic contributions and a growth chart.

Project your retirement nest egg from current savings, contributions, employer match, and expected returns.

Compute total return, profit, and annualized CAGR from initial and final investment values.

Find out how long it will take to pay off a credit card balance and how much interest you will pay.

Estimate your US federal income tax for 2024 using the standard deduction and current brackets.

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

Convert between hourly wage and annual salary, and see weekly, monthly, and daily breakdowns.

See how inflation erodes purchasing power over time, or how much today's dollars will be worth in the future.

Calculate your Body Mass Index in metric or imperial units and see the WHO weight category.

Estimate your Basal Metabolic Rate and Total Daily Energy Expenditure using the Mifflin-St Jeor equation.

Estimate your body fat percentage using the US Navy circumference method.

Personalized daily calorie target based on your TDEE and goal — maintain, lose, or gain weight.

Estimate your pregnancy due date using Naegele's rule and see your current gestational age.

Estimate your ideal body weight using the Devine, Robinson, Miller, Hamwi formulas, plus the healthy BMI range.

Calculate your max HR and 5 training zones using the Karvonen heart rate reserve method.

Estimate your daily water needs based on body weight and exercise minutes.

Online scientific calculator with trigonometric, logarithmic, exponent, and root functions.

Find X% of Y, what % X is of Y, and percent change between two values.

Add, subtract, multiply, and divide fractions. Results are simplified automatically.

Simplify ratios and solve A : B = C : D proportions.

Compute powers (base^exponent) and Nth roots of any number.

Compute mean, median, variance, and standard deviation (population and sample) for a list of numbers.

Solve ax² + bx + c = 0 with the quadratic formula. Handles real and complex roots.

Convert between mm, cm, m, km, inches, feet, yards, and miles instantly.

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

Convert between mL, L, fluid ounces, cups, pints, quarts, gallons, and cubic meters.

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

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

Convert between Celsius, Fahrenheit, and Kelvin.

Convert between major world currencies using static reference rates.

Convert a date and time across major world time zones, accounting for daylight saving time.

Convert between teaspoons, tablespoons, cups, fluid ounces, mL, and L for recipes.

Calculate exact age in years, months, days, weeks, and hours from a date of birth.

Calculate the number of days, weeks, months, and years between any two dates.

Quickly find the number of days until or since any target date.

Add up daily work hours from clock-in/clock-out times and unpaid breaks. Optionally compute gross pay.

Count business days between two dates, or find the date N business days from a starting point.

Calculate the area of a rectangular space in ft², yd², m², and acres.

Calculate cubic yards of concrete needed for a slab, including 60lb and 80lb bag counts.

Estimate gallons of paint needed for a room based on perimeter, height, doors, windows, and coats.

Calculate how many tiles you need for a floor, including waste percentage.

Estimate roofing squares and shingle bundles for a simple gable roof from footprint and pitch.

Generate strong random passwords and see entropy strength in real time.

Generate one or many random integers within a custom range using a cryptographically secure RNG.

Compute your GPA on a 4.0 scale from course grades and credit hours.

Calculate your weighted course grade from individual assignment scores and weights.

Calculate sale price after a percentage discount, with optional sales tax.

Add sales tax to a subtotal and see the total cost.

Calculate miles per gallon from miles driven and gallons used, plus a trip cost estimator.