Everyday calculators, sharpened up

Mortgage Calculator

Estimate your monthly mortgage payment, total interest, and payoff.

Auto Loan Calculator

Calculate your monthly car payment and total interest.

Loan Calculator

Find the monthly payment on any fixed-rate loan.

Amortization Calculator

See how much of each payment goes to principal vs. interest.

Investment Calculator

Project the future value of an investment with contributions.

Compound Interest Calculator

See how a lump sum grows with compounding over time.

Savings Calculator

How much you'll save with regular deposits.

CD Calculator

See what a CD pays at maturity.

Retirement Calculator

Project your retirement nest egg.

ROI Calculator

Return on investment, simple and annualized.

Inflation Calculator

See how much purchasing power changes over time.

Simple Interest Calculator

Interest = P × r × t (no compounding).

Credit Card Payoff Calculator

How long to pay off a balance — and total interest.

Refinance Calculator

Compare your current loan to a new one.

Salary Calculator

Convert hourly, weekly, monthly, and annual pay.

Sales Tax Calculator

Add (or strip out) sales tax from a price.

Discount Calculator

Find the sale price after a percentage off.

BMI Calculator

Calculate your Body Mass Index from height and weight.

BMR Calculator

Basal metabolic rate — calories burned at rest.

TDEE Calculator

Total daily energy expenditure — calories you burn in a day.

Calorie Calculator

How many calories you need per day for your goal.

Ideal Weight Calculator

Estimate ideal body weight from height and sex.

Body Fat Calculator

U.S. Navy method for body fat percentage.

Macro Calculator

Split daily calories into protein, carbs, and fat.

Pace Calculator

Pace, distance, and finish time for runners.

One Rep Max Calculator

Estimate your one rep max from a tested rep.

Pregnancy Due Date Calculator

Estimate your due date from your last period.

Ovulation Calculator

Predict your fertile window.

Heart Rate Zones Calculator

Find your training zones from age.

Water Intake Calculator

Daily water target based on body weight and activity.

Percentage Calculator

What is X% of Y, what % is X of Y, and percent change.

Fraction Calculator

Add, subtract, multiply, and divide two fractions.

Random Number Generator

Generate a random integer between two bounds.

Dice Roller

Roll N dice with X sides.

Average Calculator

Mean, median, mode, and range of any number list.

Standard Deviation Calculator

Population and sample standard deviation.

Ratio Calculator

Simplify, solve, and scale ratios.

Exponent Calculator

Compute base^exponent quickly.

Logarithm Calculator

log base b of x.

Quadratic Equation Solver

Solve ax² + bx + c = 0.

Slope Calculator

Slope, intercept, and distance between two points.

Area Calculator

Area of a rectangle, triangle, or circle.

Volume Calculator

Box, cylinder, or sphere.

Rounding Calculator

Round a number to any decimal place or multiple.

Tip Calculator

Calculate the tip and split a bill between people.

Age Calculator

Your exact age in years, months, and days.

Date Calculator

Days between two dates, or add/subtract days from a date.

Time Duration Calculator

How long between two times — in hours and minutes.

Hours Calculator

Sum hours worked across multiple shifts.

GPA Calculator

Weighted GPA from grades and credit hours.

Grade Calculator

Final course grade from assignment weights and scores.

Concrete Calculator

Cubic yards of concrete for a slab.

Tire Size Calculator

Outer diameter, sidewall height, and circumference from a tire code.

Love Calculator

A totally unscientific compatibility score from two names.

Fuel Cost Calculator

How much a trip costs in gas.

Gas Mileage Calculator

MPG or km/L from distance and fuel used.

Length Converter

Inches, feet, meters, miles, km, yards.

Weight Converter

Pounds, kilograms, grams, ounces, stones.

Temperature Converter

Celsius, Fahrenheit, Kelvin.

Password Generator

Strong random passwords, your length and rules.

Sleep Calculator

When to sleep (or wake) to align with 90-minute cycles.

Height Converter

Feet/inches ↔ centimeters.

Roman Numeral Converter

Number ↔ Roman, up to 3,999,999.

Countdown Calculator

Days, hours, minutes until any date.