Guides & tips
Math Guides
Simple explanations of percentages and everyday calculations, with worked examples. Each guide shows the formula with worked examples, so you can check the answer yourself. Use the free calculators for percentages, age, GPA, loans and more.Learn percentage formulas, how to calculate exact age, GPA and CGPA, loan EMI and Roman numerals. Each article shows the method step by step so you understand the result, not just the number.
How to Calculate GPA and CGPA: Step-by-Step With Examples
GPA and CGPA explained with a 4.0 grade-point table, worked examples, weighted GPA and a free calculator.
Roman Numerals: How to Read and Write Them (1 to 3,999)
The seven Roman numeral symbols, the subtractive rule, step-by-step examples for reading and writing any number from 1 to 3,999, and the mistakes to…
How to Calculate Age From Date of Birth in Years, Months and Days
Work out exact age from a date of birth in years, months and days — by hand, in Excel or Google Sheets, or instantly…
Loan EMI Formula: How to Calculate EMI With a Worked Example
The EMI formula explained with a step-by-step example, how tenure and interest rate change your total cost, and a free EMI calculator.
How to Calculate Percentages: Simple Formulas With Examples
Easy formulas for percentage of a number, percentage change, increases and discounts — with worked examples and a free calculator.