Everyday calculators

Calculate a recommended weekly, monthly, and annual allowance based on your child's age, chore hours, or a percentage of household income.

Split a restaurant bill evenly across any number of people, including tip. See how much each person owes.

Estimate your personal annual carbon footprint from driving, electricity, natural gas, and flights using EPA emission factors.

Convert your cat's age to the human equivalent — or find the cat age for any human age. Includes life stage from Kitten to Geriatric.

Calculate the monetary value of household chores to set allowances or understand the economic worth of unpaid household labor.

Calculate how much you save per year by making coffee at home instead of buying at a café, including compounded investment growth over 5, 10, and 20 years.

Calculate oven cooking times for chicken, turkey, beef, pork, lamb, salmon, and baked goods based on weight, cooking method, and doneness.

Roll any combination of dice (d4, d6, d8, d10, d12, d20, d100) with a modifier, and calculate the probability of rolling at or above a target number.

Convert your dog's age to the human equivalent. Results adjust for dog size because small dogs age more slowly than large breeds.

Calculate how much an appliance or device costs to run. Enter wattage, hours per day, days, and your electricity rate.

Calculate the total fuel cost for any trip. Enter distance, fuel efficiency, and price per gallon or liter to see total cost, fuel used, and cost per mile or kilometer in both MPG and L/100km modes.

Calculate your car's fuel economy in MPG plus cost per mile and cost per 100 miles from a fill-up.

Calculate voltage, current, resistance, and power from any two known values using Ohm's Law (V = I × R) and the power equations (P = V × I).

Convert oven temperatures between Fahrenheit, Celsius, and Gas Mark instantly. Includes a full reference table and plain-English descriptions like Cool, Moderate, Hot.

Compare the total cost of keeping your current phone plan versus switching, including upfront fees, early termination charges, and the break-even timeline.

Generate one or more random integers or decimal numbers within any range, with options to allow or prevent duplicate values.

Find out how long it takes to read any text. Enter a word count and reading speed to get minutes and seconds.

Scale any recipe up or down by changing the number of servings. Enter original and desired servings and adjust your ingredient list.

Calculate the total fuel cost of a road trip plus cost per person and cost per mile from your car's MPG and the gas price.

Calculate tip amount, total bill, and per-person split for any party size. Quick preset buttons for common tip percentages.

Calculate your WPM, CPM, accuracy, and adjusted WPM from a typing test. Enter words typed, characters, time in minutes, and number of errors.

Estimate your household's daily water usage and monthly water bill based on showers, baths, toilet flushes, dishwasher loads, laundry, and outdoor watering.