Everyday
Auto, travel, and day-to-day calculations.
Practical calculators for auto, travel and day-to-day life — fuel cost, tips, road trips and the small sums that come up often. Each shows the formula and its assumptions, so the answer is easy to check and adjust to your situation.
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 a road trip's fuel cost: (distance ÷ MPG) × gas price, with round-trip and per-traveler split. A 500-mi round trip at 30 MPG and $3.70 is about $62.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.