๐ ๏ธ Free Online Calculators & Tools
No downloads, no sign-ups. Financial planning, health tracking, math helpers, and unit converters โ all free, all in your browser.
๐ฐ Financial Calculators
Compound Interest Calculator
See how your money grows over time with the power of compound interest. Enter your initial investment, expected return rate, and monthly contributions. Get a year-by-year growth breakdown table and use the Rule of 72 to estimate doubling time.
Loan Calculator
Calculate monthly payments for mortgages, auto loans, and personal loans. See exactly how much interest you'll pay over the full term. Compare 15-year vs 30-year mortgage options and check the 28/36 rule for housing affordability.
ROI Calculator
Calculate your total return on investment and annualized CAGR. Compare your performance against market benchmarks like the S&P 500. Works for stocks, funds, real estate, or any investment with a clear starting and ending value.
Tip Calculator
Calculate tips and split the check easily. Choose from 10%, 15%, 18%, 20%, or 25% tip rates. See how much each person owes including tip.
Credit Card Payoff Calculator
Find out how many months to pay off your credit card debt. See exactly how much interest you'll pay and how extra payments can save you hundreds or even thousands of dollars.
โค๏ธ Health Calculators
BMI Calculator
Calculate your Body Mass Index instantly. Supports both metric (cm/kg) and imperial (ft+in/lbs) units. Get your BMI category based on WHO standards, plus your healthy weight range. Includes waist-to-height ratio recommendations.
TDEE Calorie Calculator
Find your Total Daily Energy Expenditure using the Mifflin-St Jeor formula. Get personalized calorie targets for weight loss (500 kcal deficit), maintenance, or muscle gain (300 kcal surplus). Based on your age, sex, height, weight, and activity level.
Ideal Weight Calculator
Find your ideal body weight using 4 medical formulas: Devine, Robinson, Miller, and Hamwi. Based on your height, age, and gender. Results in both kg and lbs.
๐ Math & Date Tools
Percentage Calculator
Four percentage calculators in one: find X% of a number, calculate what percent X is of Y, measure percentage increase/decrease, and compute sale discounts. Includes common percentage formulas with step-by-step examples.
Age & Date Calculator
Calculate your exact age in years, months, and days from your date of birth. Also find the number of days, weeks, months, and years between any two dates. Shows countdown to your next birthday and total days lived.
Random Number Generator
Generate one or many random integers within any range you set. Perfect for contests, lottery numbers, dice rolls, game mechanics, and statistical sampling.
๐ Unit Converters
All-in-One Unit Converter
Convert between metric, imperial, and other units across 6 categories: length, weight, temperature, area, volume, and speed. Covers miles to km, pounds to kg, Fahrenheit to Celsius, acres to hectares, and more. Results update instantly as you type.
Data Storage Converter
Convert between bytes, KB, MB, GB, and TB instantly. Supports both SI decimal units and IEC binary units (KiB, MiB, GiB) for accurate tech calculations.
๐ Text Tools
Word Counter
Real-time word and character counter. Count words, characters (with and without spaces), sentences, and paragraphs. Also estimates reading time for your text.
Password Generator
Create cryptographically strong random passwords instantly. Customize length (4-128 chars) and character types. Uses crypto.getRandomValues โ 100% secure, generated locally in your browser.