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500+ free calculators across 10 categories
What is X% of Y, percent change, percent difference, markup & margin
Calculate exact age in years, months, days. Age on a future date, age difference
Body Mass Index for adults, children, teens. Metric & imperial units
Monthly payments, amortization schedule, refinance, affordability
Calculate tip amount, split bills, tip percentage, pre-tax tip
Semester GPA, cumulative GPA, grade converter, weighted GPA
Hourly to salary, salary to hourly, take-home pay, overtime pay
Compound interest, simple interest, investment growth, savings goal
Days between dates, add/subtract days, weekdays counter, countdown
Discount price, double discount, sale price, price after tax
= 30
= 20
= 50
= 250
= 60
= 150
Check your Body Mass Index
Find your exact age in years, months, days
Calculate tip & split the bill
Estimate monthly mortgage payments
Calculate your semester & cumulative GPA
Convert annual salary to hourly rate