Guides
Each guide explains the formula behind one of our calculators, walks through a worked example, and links to the tool so you can run your own numbers.
How to Calculate EMI
The loan payment formula, a worked example, and a month-by-month repayment schedule.
Open the EMI Calculator
How to Calculate BMI
The BMI formula in metric and imperial units, plus the standard adult categories.
Open the BMI Calculator
How to Calculate Percentage
Three percentage formulas: percent of a number, percent of a total, and percentage change.
Open the Percentage Calculator
How to Cite in MLA Format
MLA works-cited format for websites and books, with examples.
Open the Citation Generator
How to Calculate Name Numerology
The Pythagorean letter chart and a step-by-step worked example.
Open the Name Numerology Calculator