Everyday Calculators
Free calculators for daily life. Calculate your age, split the bill, check your GPA, and find the difference between dates.
Age Calculator
Calculate your exact age in years, months, and days. Find the time between any two dates.
How Old Was I Calculator
Find out how old you were on any date. Calculate age in years, months, days, hours, minutes, and seconds.
Add Times Calculator
Add multiple time durations together in hours, minutes, and seconds. Get results in HH:MM:SS and decimal hours.
Time Until Calculator
Calculate the time remaining until a specific time and date. Live countdown in days, hours, minutes, and seconds.
End of School Countdown Calculator
Calculate the time remaining until a specific time and date. Live countdown in days, hours, minutes, and seconds.
Weeks Between Dates Calculator
Calculate the number of weeks between two dates. Also shows total days, months, weekdays, and weekend days.
Inch Fraction Calculator
Convert inch fractions to decimal, decimal to fractions, and inches to metric. Supports all standard precisions.
Years Ago Calculator
Calculate the exact date a specified number of years ago. Find the day of the week, weeks ago, and days ago.
Tip Calculator
Calculate the right tip amount and split the bill between friends. Supports custom tip percentages.
GPA Calculator
Calculate your GPA on a 4.0 scale. Add courses with grades and credit hours for an accurate cumulative GPA.
Date Calculator
Calculate the number of days between two dates or add/subtract days from a date. Includes business days option.
Discount Calculator
Calculate sale prices, percent off savings, and reverse-calculate original prices from discounted amounts.
Hours Calculator
Calculate work hours, overtime, and pay from your time card. Track regular and OT hours.
Wind Chill Calculator
Calculate the wind chill "feels like" temperature using the NOAA formula. Includes frostbite risk estimates.
Time Calculator
Add, subtract, and calculate time in days, hours, minutes, and seconds. Includes time expression parser and date offset calculator.
Tire Size Calculator
Compare tire sizes side by side. See differences in diameter, width, sidewall, circumference, and speedometer impact.
Conversion Calculator
Convert between common units of length, temperature, area, volume, and weight.
IP Subnet Calculator
Calculate IPv4 and IPv6 subnet details including network address, broadcast, host range, and CIDR notation.
Time Card Calculator
Weekly time card with daily hours, breaks, overtime, and pay. Saves data to your browser.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any 2 values to solve the other 2.
Time Zone Calculator
Convert times between time zones. Enter a date and time, select source and target zones, and see the result instantly.
Resistor Calculator
Calculate resistance from color codes (4/5 band), series and parallel combinations, and conductor resistance.
Electricity Calculator
Estimate electricity usage and cost for any appliance. Calculate daily, weekly, monthly, and annual energy costs.
Fuel Cost Calculator
Estimate fuel cost for a trip based on distance, fuel efficiency, and gas price.
Engine Horsepower Calculator
Estimate engine horsepower from quarter-mile elapsed time or trap speed. Two methods using vehicle weight and drag strip data.
Electric Vehicle Fuel Savings Calculator
Compare gas vs electric vehicle fuel costs. Estimate annual savings, cost per mile, and long-term fuel savings.