Other Utilities

Free wind chill calculator. Enter the air temperature and wind speed to find how cold it feels, in °F or °C, and how fast frostbite can start.

Free planetary weight calculator. See what you would weigh on Mars, the Moon, Jupiter and every planet, in newtons and on a bathroom scale, in kg or lb.

Free voltage drop calculator. Find the voltage lost in a copper or aluminum wire from its size, length and current, and the smallest wire that stays within 3%.

Free URL encoder and decoder. Turn spaces and special characters into safe %20 codes for a web address, or decode percent-encoded text back to plain text.

Free tire size calculator. Find a tire's overall diameter, sidewall height and circumference from its size code, and compare two sizes and your speedometer.

Free tip calculator. Find the tip and the total on a bill, tip before or after tax, round up, and split the bill exactly between any number of people.

Free time zone calculator. Convert a time between 40+ cities and zones, with daylight saving time on the date you pick, and see when both places are at work.

Free time duration calculator. Find the hours and minutes between two times, past midnight or across days, with an optional break and pay for the time worked.

Free time card calculator. Add up a week of clock-in and clock-out times with breaks and night shifts, and see total hours, overtime and pay.

Free tile calculator. Find how many tiles you need for a floor or wall from the room size and tile size, with grout joint, waste allowance, boxes and cost.

Free stair calculator. Find the number of steps, riser height, tread depth, run, stringer length and angle from your total rise, with code checks.

Free resistor color code calculator. Read the resistance and tolerance from 4, 5 or 6 color bands, or find the color bands for any resistor value.

Free password generator. Make strong random passwords of 6 to 128 characters in your browser, with strength shown in bits and the time it would take to guess.

Free Ohm's law calculator. Enter any two of voltage, current, resistance and power to find the other two, with units from milli to kilo and a resistor rating.

Free mulch calculator. Find how many cubic yards or meters and how many bags of mulch you need for a garden bed, by depth, with bulk and bag cost compared.

Free molecular weight calculator. Find the molar mass of any formula, with brackets and hydrates, the share of each element, and convert grams to moles.

Free molarity calculator. Find the molarity of a solution, the grams of solute to weigh for a wanted molarity, or how to dilute a stock with M1V1 = M2V2.

Free mileage calculator. Find your fuel mileage from odometer readings and fuel used, in MPG, km per liter and L/100 km, with the fuel cost per mile or km.

Free mass calculator. Find the mass of an object from its density and volume, or find the volume or density, in g, kg, lb and oz, with a list of materials.

Free love calculator. Enter two names for a fun compatibility score from 45% to 100%. A game for entertainment; the order of the names does not matter.

Free IP subnet calculator. Enter an IPv4 address and a CIDR prefix to get the subnet mask, network, broadcast, first and last host, and the usable hosts.

Free hours calculator. Add up the time between start and end times, including night shifts, with an optional break and hourly pay. Shows hours and minutes.

Free horsepower calculator. Find engine power from torque and RPM in hp, PS and kW, or find the torque from a power figure, with the power at the wheels.

Free heat index calculator. Find how hot it feels from the air temperature and humidity, in °F or °C, with the National Weather Service danger level.

Free gravel calculator. Find how many cubic yards and tons of gravel you need for a driveway, path or bed from its size and depth, with the cost.

Free grade calculator. Find your percentage and letter grade, work out a weighted grade, or see the score you need on the final exam for the grade you want.

Free GPA calculator. Add your courses, letter grades and credits to find your GPA on the 4.0 scale, with plus and minus grades and your earlier GPA.

Free golf handicap calculator. Find the score differential of a round, your Handicap Index from recent rounds, and your Course Handicap from slope and rating.

Free gas mileage calculator. Find your MPG from one or several fill-ups, in miles and gallons or km and liters, with the cost per mile and a yearly estimate.

Free fuel cost calculator. Find the fuel cost of a trip from the distance, your MPG and the price of fuel, for one way or a round trip, split between people.

Free engine horsepower calculator. Estimate a car's horsepower from its weight and quarter-mile trap speed, with the power at the wheels and the time estimate.

Free electricity cost calculator. Find what a device costs per day, month and year from its watts, the hours you use it and the price per kWh.

Free online dice roller. Roll 1 to 20 dice from a coin to a D100, add a modifier or drop the lowest dice, with fair random numbers and a chart of each die.

Free dew point calculator. Find the dew point from the air temperature and relative humidity in °C or °F, with a comfort level and a chance of dew or fog.

Free density calculator. Find density from mass and volume, or from the size of a box, cylinder or sphere, in g/cm³ and kg/m³, and see the closest material.

Free day of the week calculator. Find the weekday of any date from year 1 to 9999, with the day of the year, the week number, leap year and days from today.

Free day counter. Count the days between two dates, with weeks, years, months and days, and how many are weekdays. Works for the past and the future.

Free date calculator. Add or subtract years, months, weeks, days or business days from any date and see the new date with its weekday. Works for deadlines.

Free concrete calculator. Find the cubic yards of concrete for a slab or patio and the number of 40, 50, 60 and 80 lb bags, with the cost of bags or ready-mix.

Free BTU calculator. Find the cooling capacity a room needs in BTU per hour, kW and tons, with climate, sun, ceiling height and people, and the AC size.

Free bra size calculator. Find your band and cup size from your underbust and bust measurements in inches or cm, with US or UK cup letters and sister sizes.

Free download time calculator. Find how long a file takes to download from its size and your speed in Mbps, with overhead, MB/s and the time at other speeds.

Free age calculator. Find your exact age in years, months and days from your date of birth, with total days, your birth weekday and days to your next birthday.