Math & Calculator Tools
Free online calculators for math, finance, health, and everyday tasks. All calculations run instantly in your browser — no app downloads needed.
Percentage Calculator
Calculate percentages, percentage change, and "what is X% of Y"
Scientific Calculator
Full scientific calculator with trig, log, and exponent functions
Unit Converter
Convert between length, weight, volume, temperature, and more
Loan Calculator
Calculate monthly payments with full amortization schedule
BMI Calculator
Calculate Body Mass Index in imperial or metric units
Tip Calculator
Calculate tips and split bills between any number of people
Discount Calculator
Calculate sale prices, savings, and stacked discounts
Age Calculator
Calculate exact age in years, months, and days
Date Calculator
Calculate date differences and add/subtract days from dates
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Electricity Calculator
Solve Ohm's Law and calculate energy costs
Fuel Cost Calculator
Calculate trip fuel costs and convert between MPG and L/100km
Pace Calculator
Calculate running pace, speed, and race time predictions
Number to Words
Convert numbers to their written English word form