Calculators
Quick finance, health, and unit calculations in your browser.
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BMI Calculator
Calculate your Body Mass Index (BMI) using metric (kg/cm) or imperial (lb/ft/in) units. See your weight category on a color-coded scale — 100% client-side.
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TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and BMR using the Mifflin-St Jeor formula. Get personalized calorie targets for weight loss or muscle gain.
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Loan Calculator
Calculate monthly mortgage or car loan payments and view the full amortization schedule with principal vs interest — instant, 100% private.
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Tip Calculator
Calculate the tip and split the bill evenly among any number of people. Choose from preset percentages or enter a custom rate — instant, no sign-up.
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Age Calculator
Find your exact age in years, months, and days from any birth date. See total days lived, birthday countdown, day of the week you were born — free browser tool.
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Date Difference
Count exact days, weeks, months, or years between any two dates. Toggle business-days-only mode for project planning and deadline tracking — no account needed.
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Percentage Calculator
Three percentage calculators in one: find X% of Y, calculate what percent X is of Y, and compute percentage increase or decrease — instant results, no sign-up.
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Length Converter
Convert between mm, cm, m, km, inches, feet, yards, and miles. Type any value and all other fields update instantly — the fastest free online length converter.
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Weight Converter
Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, stones, and long tons. Enter any value and all others update instantly — free tool.
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Timezone Converter
Convert any date and time across multiple timezones simultaneously. Add as many target zones as needed — ideal for scheduling international meetings and calls.
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Why use browser-based calculators?
Every calculator on this page runs entirely inside your browser using standard JavaScript — no data is ever sent to a server. That means your health stats, financial numbers, and personal dates stay completely private. The calculations are instant, work offline once the page has loaded, and are accessible on any device.