Free Online Calculators for Everyday Life

Fast, accurate and private calculators and unit converters for money, health, math and daily life. No sign-up, no clutter — just clear answers with the formulas explained.

Finance Calculators

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Mortgage CalculatorMonthly house payment with taxes, insurance, PMI and amortization. Loan CalculatorMonthly payment and total interest for any fixed-rate loan. Compound Interest CalculatorSee how savings grow with compounding and monthly deposits. Auto Loan CalculatorMonthly car payment with sales tax, fees and trade-in. Salary CalculatorConvert hourly wage to yearly salary and every pay period. Credit Card Payoff CalculatorHow long to pay off a card, and how much interest it costs. Retirement CalculatorProject your retirement savings and income in today's dollars.

Health & Fitness Calculators

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BMI CalculatorBody mass index, BMI category and healthy weight range. Calorie CalculatorDaily calories (TDEE) to maintain, lose or gain weight. BMR CalculatorBasal metabolic rate with Mifflin-St Jeor, Harris-Benedict & more. Body Fat CalculatorBody fat percentage from tape measurements (U.S. Navy method). Ideal Weight CalculatorIdeal body weight for your height using four medical formulas. Due Date CalculatorPregnancy due date, weeks pregnant and key milestones. Sleep CalculatorBest bedtime or wake-up time based on 90-minute sleep cycles.

Math Calculators

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Percentage CalculatorPercent of a number, percent change, increase and difference. Fraction CalculatorAdd, subtract, multiply and divide fractions with steps. Average CalculatorMean, median, mode and range of a list of numbers. Standard Deviation CalculatorSample or population standard deviation and variance, with steps. Random Number GeneratorPick random whole numbers in any range, with or without repeats. GPA CalculatorSemester and cumulative GPA from letter grades and credits. Final Grade CalculatorScore you need on the final exam to reach your target grade.

Everyday Calculators

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Age CalculatorExact age in years, months and days, plus next birthday. Date CalculatorDays between two dates, or add and subtract days from a date. Hours CalculatorHours worked between two times, minus breaks, plus pay. Tip CalculatorTip amount, total and per-person split for any bill. Discount CalculatorSale price after a percent off, savings and stacked discounts. Sales Tax CalculatorAdd sales tax to a price or remove it from a total. Square Footage CalculatorArea of a room or floor in square feet, with cost estimate.

Unit Converters

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Centimeters to InchesConvert centimeters to inches (cm → in). Inches to CentimetersConvert inches to centimeters (in → cm). Centimeters to FeetConvert centimeters to feet (cm → ft). Feet to CentimetersHeight in feet and inches to centimeters. Meters to FeetConvert meters to feet (m → ft). Feet to MetersConvert feet to meters (ft → m). Kilometers to MilesConvert kilometers to miles (km → mi). Miles to KilometersConvert miles to kilometers (mi → km).

Instant results

Answers update as you type. No page reloads, no waiting, no sign-up.

Formulas explained

Every calculator shows the math behind it, a worked example and common questions.

Private by design

Calculations run in your browser. The numbers you enter never leave your device.

Works everywhere

Fast on phones, tablets and desktops, with light and dark themes.

Free calculators for every part of life

BuzzCalc is a growing collection of free online calculators designed to give you accurate answers quickly. Whether you're comparing mortgage payments, checking your BMI, working out a percentage, finding your exact age or converting centimeters to inches, each tool is built to be simple on the surface and rigorous underneath.

We explain how every result is calculated, show worked examples and point out the limits of each formula, so you can make informed decisions about your money, health and time. All calculators are free, need no account and run entirely on your device.

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