Blog
Step-by-step guides to the maths behind the calculators.
Money & Finance
How do you calculate a 20% raise?
Find your new salary and the yearly difference in three steps.
September 12, 2026
Money & Finance
How do you calculate a discount?
Work out the sale price and how much you save in seconds.
September 10, 2026
Date & Time
How do you calculate age from a date of birth?
Get your age in years, months and days, and how many days you've lived.
September 8, 2026
Money & Finance
How do you calculate a price with and without VAT?
Add VAT or take it out: see the net, VAT and gross amounts together.
September 5, 2026
Money & Finance
How do you calculate a percentage?
Find a percentage of a number, what percent one number is of another, and percent change.
September 2, 2026
Date & Time
How many days are there between two dates?
Find the difference in days, weeks, months and working days in one step.
August 28, 2026