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Calculate simple interest quickly and easily
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A simple metronome to help you keep time while practicing music
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Estimate Basal Metabolic Rate and Total Daily Energy Expenditure using age, sex, height, weight, and activity. Uses the Mifflin–St Jeor equations.
Daily Water Consumption Calculator
Estimate approximate daily water intake from weight and age. Results are guidelines and do not replace medical advice.
BMI Calculator (Body Mass Index)
Calculate your BMI and see the weight status category. Supports metric and imperial units.
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Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy method with simple measurements.
Macro Calculator (Protein / Carbs / Fat)
Estimate TDEE, set calorie targets by goal, and get daily macros in grams and percentages.
Rule of Three
Solve proportions easily with the rule of three
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Solve quadratic equations using Bhaskara's formula
Pythagorean Theorem
Calculate hypotenuse or legs of a right triangle
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Calculate simple arithmetic and weighted averages
LCM and GCD
Calculate Least Common Multiple and Greatest Common Divisor
Percentage Calculator
Calculate percentages, increases, discounts and simple interest
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Timer for Pomodoro productivity technique
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Calculate the time difference between two dates and times
JSON Validator & Formatter
Validate, format and minify JSON
TOON Validator & Formatter
Validate and format TOON (TOML-like) format
JSON Diff
Compare and analyze differences between JSONs
JSON ↔ TOON Converter
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UUID Generator
Generate universally unique identifiers (UUID)
Coin Flip
Flip a virtual coin to make random decisions
Dice Roll
Roll virtual dice of different types for games and decisions
Raffle
Conduct fair and random draws among participants
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Generate secure and customizable passwords
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QR Code Generator
Generate customizable QR codes with colors, margins, and export.