How to Calculate Your BMR (Mifflin-St Jeor Formula Explained)
Learn what BMR is, how the Mifflin-St Jeor formula works, and how to calculate your BMR step by step with worked examples for men and women.
Health & Fitness
Health & Fitness
How Many Calories Should You Eat a Day? A Practical Guide
Find out how many calories you need each day based on your age, sex, size, and activity level – with the formula, worked examples, and safe targets for every goal.
Health & Fitness
How Much Protein Do You Need Per Day? (With g/kg Targets)
Learn how much protein you need per day by weight and goal – from the 0.8 g/kg minimum to muscle-building targets – with worked examples and food guides.
Math & Education
How to Calculate Percentages: Increase, Decrease, and Difference
Master the three percentage formulas – percentage of a number, X as a percent of Y, and percentage change – with worked examples and mental-math shortcuts.
Islamic Guides
How to Calculate Zakat on Cash, Gold, and Savings (Step by Step)
A clear, respectful guide to calculating zakat: the 2.5% rate, gold and silver nisab thresholds, which assets count, deductible debts, and a worked example.
Math & Education
How to Calculate Your GPA (Weighted and Unweighted)
Learn how to calculate GPA step by step: the 4.0 scale, credit hours, weighted vs unweighted GPA, cumulative GPA, and percentage conversion tables.
Money & Finance
How Is EMI Calculated? Formula, Worked Examples, and Amortization
See exactly how EMI is calculated: the formula, a full worked example, amortization tables, flat vs reducing-balance rates, and how to lower your instalment.
Money & Finance
How Compound Interest Works: Formula, Examples, and the Rule of 72
Understand how compound interest works: the A = P(1 + r/n)^nt formula, worked examples, compounding frequency, APY, and the Rule of 72 doubling shortcut.
Money & Finance
How to Convert Hourly Wage to Annual Salary (and Back)
Convert hourly pay to annual salary with one formula, a full conversion table, the 2,080-hour rule, and the adjustments that make your estimate accurate.
Health & Fitness
How to Calculate Body Fat Percentage at Home (Navy Method)
Estimate your body fat percentage with just a tape measure: Navy method formulas for men and women, a worked example, and healthy ranges to compare against.