Quick calculators for everyday math.

Percentage of a number

Example: what is 18% of 250?

Result –

What percent is one number of another?

Example: 45 is what percent of 180?

Result –

Percentage change (increase or decrease)

Example: by what percent did 80 grow to 100?

Result –

Add or subtract a percentage

Example: add 15% to 500, take 15% off 500.

With percentage added –

With percentage taken off –

Difference between two dates

Exact difference –

Total days –

Weeks –

Business days (weekends excluded) –

Age calculator

Date of birth

Age –

Next birthday –

Add or subtract days from a date

Resulting date –