Everyday Life calculators

Tipping, cooking, travel, and other useful little tools.

The calculators that come up in day-to-day life — tip splitting, cooking conversions, fuel costs, and trip planning.

Calculators

Everyday Life / Time & Date

Compute the probability that at least two people in a group share the same birthday, using the classic 1 − (365! / ((365...

basic

8,752 4.1 1 min

Everyday Life / Time & Date

Find the day of the week for any past or future date, plus the day-of-year, ISO week number, and how far the date is fro...

basic

2,237 4.8 1 min

Everyday Life / Time & Date

Estimate a tree's age from its trunk circumference at chest height and a species-specific annual growth factor.

basic

15,252 4.3 1 min

Everyday Life / Time & Date

Calculate your exact age in years, months, weeks, and days from a date of birth and a reference date.

Featured basic

8,143 4.7 1 min

Everyday Life / Time & Date

Count days, weeks, months, or years between any two dates — inclusive or exclusive of weekends.

basic

24,882 4.2 1 min

About this category

The calculators that come up in day-to-day life — tip splitting, cooking conversions, fuel costs, and trip planning.

Missing a calculator in Everyday Life? We'd love to hear what to build next.