Articles
Short, practical guides that explain the maths behind our tools.
How to calculate percentage and discount
Formulas, sale prices, tax and common mistakes.
Profit and loss explained
Profit percent, margin versus markup, and pricing.
Common unit conversions
Length, weight, temperature and currency made simple.
Tool guides
Basic calculator
Everyday sums on any device.
Percentage and discount
Percent of a number, sale price, add percent.
Profit and loss
Cost versus selling price.
Unit and currency converter
Length, weight, temperature, currency.
How-to blog
Ten step-by-step posts with worked examples are in our Blog.
Quick answers
Looking for a short answer instead of a full guide? Our FAQ answers 60 common questions about percentages, profit and loss, conversions and the site.
By country
Guides for your location: Pakistan · India · United States.