Everyday Calculators
Free calculators for daily life. Calculate your age, split the bill, check your GPA, and find the difference between dates.
Age Calculator — Years, Months, Days, Hours Exactly
Calculate your exact age in years, months, and days. Find the time between any two dates down to seconds.
How Old Was I Calculator — Age on Any Past Date
Find out how old you were on any date. Calculate age in years, months, days, hours, minutes, and seconds.
Add Times Calculator — Sum HH:MM:SS Durations
Add multiple time durations together in hours, minutes, and seconds. Get results in HH:MM:SS and decimal hours.
Time Until Calculator — Live Countdown to Any Date
Calculate the time remaining until a specific time and date. Live countdown in days, hours, minutes, and seconds.
End of School Countdown — Live Days, Hours, Minutes
Live countdown to the end of the school year. See remaining days, hours, minutes, and seconds in real time.
Weeks Between Dates Calculator — Plus Days & Months
Calculate the number of weeks between two dates. Also shows total days, months, weekdays, and weekend days.
Inch Fraction Calculator — Decimal, Fraction, mm
Convert inch fractions to decimal, decimal to fractions, and inches to metric. Supports all standard precisions.
Years Ago Calculator — Exact Date X Years Back
Calculate the exact date a specified number of years ago. Find the day of the week, weeks ago, and days ago.
Tip Calculator — Compare %, Split Bill, Pre-Tax Mode
Calculate tips with rounding options, pre-tax tipping, service charge support, and bill splitting. Compare pre-tax vs post-tax tip amounts.
GPA Calculator — 4.0 Scale, Cumulative, by Credit
Calculate your GPA on a 4.0 scale. Add courses with grades and credit hours for an accurate cumulative GPA.
Date Calculator — Days Between, Add, Business Days
Calculate days between dates or add/subtract days with business day counting and US federal holiday exclusion.
Discount Calculator — Sale Price, % Off, Reverse
Calculate sale prices, percent off savings, and reverse-calculate original prices from discounted amounts.
Hours Calculator — Time Card, Overtime, Pay
Calculate work hours, overtime, and pay from your time card. Track regular and OT hours with easy daily entry.
Wind Chill Calculator — NOAA Formula + Frostbite
Calculate the wind chill "feels like" temperature using the NOAA formula. Includes frostbite risk estimates.
Time Calculator — Add, Subtract, Duration, Date Offset
Add, subtract, and calculate time in days, hours, minutes, and seconds. Includes time expression parser and date offset calculator.
Tire Size Calculator — Compare Diameter, Speedometer
Compare tire sizes side by side. See differences in diameter, width, sidewall, circumference, and speedometer impact.
Unit Conversion Calculator — Length, Weight, Volume, °
Convert between common units of length, temperature, area, volume, and weight in one tool.
IP Subnet Calculator — IPv4, IPv6, CIDR, Broadcast
Calculate IPv4 and IPv6 subnet details including network address, broadcast, host range, and CIDR notation.
Time Card Calculator — Weekly, Biweekly, OT, CSV
Weekly or biweekly time card with daily/weekly overtime, break tracking, CSV export, and browser save.
Ohm's Law Calculator — Volts, Amps, Ohms, Watts
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any 2 values to solve the other 2.
Time Zone Calculator — Convert Between Any 2 Zones
Convert times between time zones. Enter a date and time, select source and target zones, and see the result instantly.
Resistor Calculator — Color Code, Series, Parallel
Calculate resistance from color codes (4/5 band), series and parallel combinations, and conductor resistance.
Electricity Calculator — kWh Cost per Appliance
Estimate electricity usage and cost for any appliance. Calculate daily, weekly, monthly, and annual energy costs.
Fuel Cost Calculator — Trip Gas Cost by MPG & Price
Estimate fuel cost for a trip based on distance, fuel efficiency, and gas price.
Horsepower Calculator — Torque, HP↔kW, Quarter Mile
Calculate HP from torque × RPM ÷ 5252, convert between HP, kW, PS, and watts, or estimate engine HP from quarter-mile time and trap speed.
EV Fuel Savings Calculator — Gas vs Electric Annual
Compare gas vs electric vehicle fuel costs. Estimate annual savings, cost per mile, and long-term fuel savings.