Every number question, answered on the first screen
Calculators for percentages, dates, money, and health. Converters for every everyday unit. No signup, answer shown instantly with the formula behind it.
Everyday
Percentage Calculator
What is X% of Y, percent change, and percent of a total.
EverydayTip Calculator
Tip amount and per-person split for any bill.
EverydayDiscount Calculator
Sale price after a percent-off discount, and how much you save.
EverydayFuel Cost Calculator
Trip fuel cost from distance, MPG, and gas price.
EverydayGPA Calculator
Semester and cumulative GPA on the 4.0 scale.
EverydaySales Tax Calculator
Add tax to a price, or back it out of a receipt total.
EverydayUnit Price Calculator
Compare package sizes by cost per unit.
EverydayAspect Ratio Calculator
Resize width and height without distorting proportions.
EverydayPaint Calculator
Gallons needed from wall size, coats, and openings.
Dates
Age Calculator
Exact age in years, months, and days from a birth date.
DatesDate Difference Calculator
Days, weeks, months, and years between two dates.
DatesBusiness Days Calculator
Working days between dates, weekends excluded.
DatesDays From Today
What date is N days from today, for any N.
Money
Loan Calculator
Monthly payment, total interest, and payoff schedule.
MoneyMortgage Calculator
Monthly mortgage payment with taxes and insurance.
MoneyCompound Interest Calculator
Growth of savings or investments with regular deposits.
MoneySalary to Hourly Converter
Annual salary to hourly wage, and back.
MoneyROI Calculator
Total return and annualized CAGR from cost and final value.
Health
BMI Calculator
Body mass index in metric or imperial units.
HealthTDEE Calculator
Daily calorie needs from activity level and stats.
HealthSleep Calculator
Bedtimes that end sleep at the top of a 90-minute cycle.
Unit converters
Length
Millimeters, Centimeters, Meters, Kilometers and more.
ConverterWeight
Milligrams, Grams, Kilograms, Ounces and more.
ConverterTemperature
Celsius, Fahrenheit, Kelvin and more.
ConverterVolume
Milliliters, Liters, Teaspoons, Tablespoons and more.
ConverterArea
Square Feet, Square Meters, Square Yards, Acres and more.
ConverterSpeed
Miles per Hour, Kilometers per Hour, Knots, Meters per Second and more.
ConverterTime
Seconds, Minutes, Hours, Days and more.
ConverterPressure
Pascals, Kilopascals, Bar, PSI and more.
ConverterEnergy
Joules, Kilojoules, Calories (small), Kilocalories (food) and more.
ConverterDigital Storage
Kilobytes, Megabytes, Gigabytes, Terabytes and more.
Popular lookups
Why another calculator site?
Because most of them bury the answer under three screens of ads, or round conversions with pocket-reference values from 1974. CalcGauge uses exact legal unit definitions, shows the formula next to every result, and puts the answer at the top of the page where it belongs.