Engine Horsepower Calculator
Estimate horsepower from vehicle weight and quarter-mile trap speed.
Open Calculator →Fuel Cost Calculator
Find how much fuel a trip will cost, in US (mpg) or metric (L/100km) units.
Open Calculator →Gas Mileage Calculator
Find your fuel economy in mpg, L/100km, or km/L from distance and fuel used.
Open Calculator →Tip Calculator
Find the tip amount and total bill, split evenly across any number of people.
Open Calculator →Tire Size Conversion Calculator
Find sidewall height, overall diameter, and circumference from a standard tire size code.
Open Calculator →Dice Roller
Roll any number of dice with any number of sides — d6, d20, and custom presets.
Open Calculator →Golf Handicap Calculator
Calculate your golf Handicap Index from course rating, slope rating, and score, using the WHS formula.
Open Calculator →Horsepower Calculator
Convert between mechanical HP, metric HP (PS), watts, and kW — or compute HP from torque and RPM.
Open Calculator →Love Calculator
A lighthearted compatibility percentage from two names — for fun only, no science involved.
Open Calculator →Mileage Calculator
Calculate fuel economy in MPG and L/100km, or find the total fuel cost of a trip from distance, MPG, and gas price.
Open Calculator →Sleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles, so you wake up between cycles, not mid-cycle.
Open Calculator →