All Tools
Browse all tools on Harmmy Tools. Simple tools for everyday problems - from calculators to AI-powered utilities.
⭐ Popular Tools
Age Calculator
Calculate your exact age in years, months, days. Find days until next birthday and track milestones. Perfect for planning celebrations and special occasions.
BMI Calculator
Calculate your Body Mass Index (BMI) and understand weight category. Get health insights, healthy weight range, and BMI classification. Supports both units.
Percentage Calculator
Use our percentage calculator to find X percent of Y. Calculate percentage increase, decrease, and difference. Quick, accurate calculations for everyday needs.
Unit Converter
Convert length, weight, temperature, area, and volume between metric and imperial units. Quick, accurate conversions for everyday use.
Mortgage Calculator
Calculate your monthly mortgage payment with PITI breakdown. Includes principal, interest, taxes, insurance, and PMI estimates. Perfect for home buyers.
JSON Formatter
Free online JSON formatter to beautify, validate, and minify JSON. Instant pretty print with syntax error detection. No upload, works on mobile.
Categories
All Tools
Age Calculator
Calculate your exact age in years, months, days. Find days until next birthday and track milestones. Perfect for planning celebrations and special occasions.
BMI Calculator
Calculate your Body Mass Index (BMI) and understand weight category. Get health insights, healthy weight range, and BMI classification. Supports both units.
Date Difference Calculator
Calculate days, months, years between two dates. Find weekdays count, total weeks, plan events. Perfect for tracking milestones and calculating deadlines.
Loan Calculator
Use our loan calculator to estimate monthly payments. Compare equal payment vs equal principal, calculate interest. Perfect for mortgages and financial plans.
Percentage Calculator
Use our percentage calculator to find X percent of Y. Calculate percentage increase, decrease, and difference. Quick, accurate calculations for everyday needs.
Discount Calculator
Use our discount calculator to find sale price and savings. Calculate discounts, final prices for shopping. Save money on purchases with accurate calculations.
Tip Calculator
Use our tip calculator to calculate tips and split bills. Find tip percentage, total amount, split costs among friends. Essential for dining out and groups.
Time Calculator
Convert days, hours, minutes, and seconds. Calculate total time in different units and get formatted display. Perfect for project planning and time tracking.
Compound Interest Calculator
Calculate compound interest growth for all your investments. See how money grows with different compounding frequencies. Perfect for retirement planning.
Calorie Calculator
Calculate your daily calorie needs (TDEE) and BMR using Mifflin-St Jeor. Get fitness and nutrition tips for weight loss, maintenance, and muscle gain.
Unit Converter
Convert length, weight, temperature, area, and volume between metric and imperial units. Quick, accurate conversions for everyday use.
GPA Calculator
Calculate your GPA with our easy-to-use GPA calculator. Supports 4.0 scale, multiple courses, and weighted credits. Perfect for students.
Mortgage Calculator
Calculate your monthly mortgage payment with PITI breakdown. Includes principal, interest, taxes, insurance, and PMI estimates. Perfect for home buyers.
Credit Card Calculator
Calculate how long it will take to pay off your credit card balance. See total interest, monthly breakdown, and payoff date. Free credit card payoff calculator.
Savings Calculator
Calculate your savings growth with compound interest. See future value, total contributions, interest earned, and yearly growth. Free savings calculator.
JSON Formatter
Free online JSON formatter to beautify, validate, and minify JSON. Instant pretty print with syntax error detection. No upload, works on mobile.