Simple Tools for Everyday Life
Free calculators that run instantly in your browser.
No signup, browser-based calculations, no friction.
19 tools
No signup
100% private
Works offline
Date & Time
Age Calculator
Exact age in years, months, and days — appears the moment you pick a date.
Everyday Math
Percentage Calculator
Percentages, percent change, and differences — three calculators in one.
Health
BMI Calculator
Body Mass Index with WHO category, visual scale, and healthy weight range.
📅 Date & Time
7 tools
Age Calculator
Exact age in years, months, and days from any birth date.
Birthday Countdown
Days, hours, and minutes until your next birthday.
Days Between Dates
Exact number of days between any two dates.
Days Until a Date
Countdown to any future date with holiday presets.
💪 Health & Fitness
3 tools
BMI Calculator
Body Mass Index with WHO category and healthy weight range.
Water Intake Calculator
Daily water goal based on your weight and activity level.
Sleep Time Calculator
Ideal bedtime or wake-up time based on sleep cycles.
🧮 Everyday Math
6 tools
Percentage Calculator
Percentages, percent change, and differences in one place.
Unit Converter
Length, weight, temperature, volume, speed, and more.
Tip Calculator & Bill Splitter
Tip amount, total per person, and bill split for any group.
Random Number Generator
Any range, multiple numbers, no-duplicates option.
🎓 Education
1 tool
GPA Calculator
Courses, credits, and grades → GPA on a 4.0 scale.
Articles & Guides
View all
Health
Understanding BMI: What It Really Means
The BMI formula, WHO categories, and its limitations compared to other health metrics.
Health
Sleep Cycles Explained: Optimize Your Sleep
NREM and REM stages, how to time your sleep for maximum rest.
Education
How to Calculate Your GPA
GPA on the 4.0 scale, letter grade conversions, and strategies to improve.
Everyday Math
Understanding Percentages in Everyday Life
Discounts, tips, taxes, grades, and financial decisions.