Everyday
Auto, travel, and day-to-day calculations.
29 calculators
Angle Converter — degrees, radians, gradians & moreConvert angles between degrees, radians, gradians, arcminutes, arcseconds and revolutions. 180 degrees is π radians (about 3.141593).Area Converter — square feet, square meters, acres, hectares & moreConvert area between metric and imperial units — square meters, square feet, square miles, acres and hectares. 1 acre is 43,560 square feet; 1 hectare is about 2.471 acres.BTU Calculator — what size air conditioner do I need?Find the cooling capacity (BTU) a room air conditioner needs from the room's size, using the Energy Star chart with adjustments for sun, occupants and kitchen use. A 300 sq ft room needs about 8,000 BTU.Cooking Measurement Converter — cups, grams & ml by ingredientConvert cooking measurements between cups, tablespoons, grams, ounces and millilitres for flour, sugar, butter, honey and more — using each ingredient's density from USDA cup weights.Data Storage Converter — GB, MB, GiB, TB, bits & bytesConvert digital storage between bytes, kilobytes, megabytes, gigabytes and terabytes (decimal, ×1000) and kibibytes, mebibytes, gibibytes (binary, ×1024). 1 GB = 1000 MB; 1 TB ≈ 931 GiB.Distance Calculator — from speed and timeCalculate distance travelled from speed and time: distance = speed × time. Enter matching units (mph and hours → miles, m/s and seconds → metres).Electricity Cost Calculator — appliance running costCalculate the cost of running an appliance: energy in kWh = watts ÷ 1000 × hours × days, then cost = kWh × your price per kWh. Enter wattage, usage and rate.Energy Converter — joules, calories, kWh, BTU & moreConvert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and electronvolts. 1 kilocalorie is 4.184 kilojoules.EV Charging Cost Calculator — cost to drive on electricityEstimate the electricity cost of an EV trip from distance, efficiency (miles per kWh) and price per kWh: cost = (distance ÷ mi/kWh) × price.Final Grade Calculator — score needed on the final examFind the score you need on your final exam to reach a target course grade: needed = (target − current × (1 − weight)) ÷ weight. Enter your current grade and the final's weight.Force Converter — newtons, pounds-force, kgf & moreConvert force between newtons, kilonewtons, dynes, pounds-force, kilograms-force and ounces-force. 1 pound-force is about 4.4482 newtons.Frequency Converter — hertz, kHz, MHz, GHz & rpmConvert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute (rpm). 1 gigahertz is 1,000 megahertz.Fuel Cost Calculator — cost of a tripEstimate the fuel cost of a trip from the distance, your vehicle's MPG and the fuel price: cost = (distance ÷ MPG) × price per gallon.Gas Mileage Calculator — miles per gallon (MPG)Calculate your gas mileage (fuel economy) from distance and fuel used: MPG = miles driven ÷ gallons used. Works for any consistent distance and fuel units.Horsepower Calculator — convert watts to horsepowerConvert power in watts (or kilowatts) to mechanical horsepower: hp = watts ÷ 746, since 1 hp = 746 W. Enter the power in watts.Length Converter — meters, feet, inches, miles & moreConvert length and distance between metric and imperial units — meters, centimeters, kilometers, inches, feet, yards and miles. 1 meter is 3.2808 feet.Power Converter — watts, kilowatts, horsepower & moreConvert power between watts, kilowatts, megawatts, horsepower, metric horsepower, BTU per hour and foot-pounds per second. 1 horsepower is about 0.7457 kilowatts.Pressure Converter — bar, psi, kPa, atm & moreConvert pressure between bar, psi, pascals, kilopascals, atmospheres, torr and mmHg. 1 bar is about 14.5038 psi.Reading Time Calculator — how long to read a textEstimate reading time from word count and reading speed: minutes = words ÷ words per minute. Defaults use research-based rates — 238 wpm silent, 183 wpm aloud.Road Trip Cost Calculator — fuel cost and splitEstimate the fuel cost of a road trip: (distance ÷ MPG) × gas price, with a round-trip option and the cost split per traveler. A 500-mile round trip at 30 MPG and $3.70 costs about $123.Screen Size Calculator — width, height & area from diagonalFind a screen's physical width, height and area from its diagonal and aspect ratio: width = diagonal × a/√(a²+b²). Works for TVs, monitors and phones.Speed Converter — mph, km/h, m/s, knots & feet per secondConvert speed between km/h, mph, meters per second, feet per second and knots. 100 km/h is about 62.14 mph; 1 knot is 1.852 km/h.Temperature Converter — Celsius, Fahrenheit & KelvinConvert temperatures between Celsius, Fahrenheit and Kelvin. 100 °C is 212 °F; body temperature 98.6 °F is 37 °C; absolute zero is 0 K, or −273.15 °C.Time Converter — seconds, minutes, hours, days & yearsConvert time between seconds, minutes, hours, days, weeks, months and years. 1 hour is 60 minutes; 1 day is 24 hours.Tire Size Calculator — diameter, sidewall & circumferenceConvert a tire code like 225/45R17 into sidewall height, overall diameter, circumference and revolutions per km. Sidewall = width × aspect ÷ 100; diameter = wheel + 2 × sidewall.Travel Time Calculator — from distance and speedCalculate how long a trip takes from distance and speed: time = distance ÷ speed. Enter matching units (miles and mph → hours).Typing Speed Calculator — words per minute (WPM)Calculate typing speed in words per minute: gross WPM = (characters ÷ 5) ÷ minutes, and net WPM subtracts errors. Uses the standard five-characters-per-word convention.Volume Converter — liters, gallons, cups, milliliters & moreConvert volume between metric and US units — liters, milliliters, gallons, quarts, pints, cups, fluid ounces, tablespoons and teaspoons. 1 US gallon is 3.7854 liters.Weight Converter — kilograms, pounds, ounces, grams & stonesConvert weight and mass between metric and imperial units — kilograms, grams, pounds, ounces and stones. 1 kilogram is about 2.2046 pounds.