15 free tools
Calculators that stay on your device.
Free online calculators for salary, loans, tips, BMI, conversions, and everyday math. Fast, private, and built to run entirely in your browser. Pick a tool, get an answer, read how the math works.
Popular
The searches people run every day: percents, tips, pay, BMI, and word count.
Money
Percentage
Calculate what X percent of Y is, what percent X is of Y, and percent increase or decrease. Instant everyday percent math.
Money
Tip & split
Calculate a tip and split a bill between friends. Set the tip percent, tax, and number of people to see what each person owes.
Money
Salary to hourly
Convert an annual salary to an hourly rate, or turn hourly pay into a yearly salary. Adjust hours per week and unpaid time off.
Everyday
BMI
Calculate body mass index from height and weight in metric or imperial units. See the standard WHO category and the formula used.
Utilities
Word counter
Count words, characters, sentences, and paragraphs. See reading time as you type or paste. Everything stays in your browser.
Money
Salary, take-home pay, loans, tips, and percent math — the queries that usually pay the bills.
Money
Salary to hourly
Convert an annual salary to an hourly rate, or turn hourly pay into a yearly salary. Adjust hours per week and unpaid time off.
Money
Take-home pay
Estimate U.S. net pay from a salary after federal income tax, Social Security, and Medicare. A simple planning figure, not a tax filing.
Money
Loan payment
Calculate a monthly loan payment from principal, interest rate, and term. See total interest and the full amount you will repay.
Money
Tip & split
Calculate a tip and split a bill between friends. Set the tip percent, tax, and number of people to see what each person owes.
Money
Percentage
Calculate what X percent of Y is, what percent X is of Y, and percent increase or decrease. Instant everyday percent math.
Everyday
Health screening numbers, dates, units, time zones, and grades.
Everyday
BMI
Calculate body mass index from height and weight in metric or imperial units. See the standard WHO category and the formula used.
Everyday
Age & dates
Calculate age from a birth date, or the exact difference between two dates in years, months, and days.
Everyday
Unit converter
Convert length, weight, and temperature between metric and imperial units. Instant, precise conversions in your browser.
Everyday
Time zones
Convert a date and time between world time zones. See the current time in each zone and a converted meeting time.
Everyday
GPA
Calculate a weighted GPA on a 4.0 scale. Add courses, letter grades, and credit hours to see your average.
Utilities
Writing, passwords, color contrast, and QR codes. Still private. Still instant.
Utilities
Word counter
Count words, characters, sentences, and paragraphs. See reading time as you type or paste. Everything stays in your browser.
Utilities
Case converter
Convert text to uppercase, lowercase, title case, sentence case, camelCase, or snake_case. Instant and private.
Utilities
Passwords
Generate a random password in your browser with cryptographically strong randomness. Choose length and character sets. Nothing is uploaded.
Utilities
Contrast
Check WCAG contrast between foreground and background colors. See AA and AAA pass/fail for normal and large text.
Utilities
QR codes
Create a QR code from a URL or text in your browser. Download a PNG. The content is never sent to a server.