Everyday Utility Calculators

Estimate how much fuel a trip will cost, in US or metric units. Enter a distance and your vehicle's fuel efficiency to get a cost, or work backward from a recent fill-up (distance driven and fuel used) to find your actual mpg or L/100km.

Find the percentage increase or decrease between two numbers, whatever they represent: a price, a population, a score, a measurement. Enter a starting value and a new value to get the change, clearly labeled as an increase or decrease.

Sleep happens in cycles of roughly 90 minutes, and waking up near the end of one tends to feel easier than being pulled out of deep sleep mid-cycle. Enter a wake-up time to get bedtime options, or a bedtime to get wake-up options, each timed to land on a full number of cycles.

Work out the tip, the total, and what each person owes. Enter the bill, pick a tip percentage, and add how many people are splitting it, if any.

Log clock-in and clock-out times for each day in your pay period, subtract unpaid breaks, and get total hours worked, both as decimal hours and hours:minutes, plus any overtime over 40 hours in a week and gross pay if you enter an hourly rate.