Math

Why the scale can go up on a day you were genuinely in a calorie deficit, what the 3,500-calorie-per-pound rule actually gets wrong, and why averaging weight and intake over 7-14 days is the only reliable way to judge progress.

Practical small business guide to break-even analysis. Learn fixed costs, variable costs, contribution margin, break-even unit volume formulas, and pricing strategy.

Essential retail and e-commerce pricing guide. Learn the mathematical difference between Gross Profit Margin and Markup, master conversion formulas, and avoid pricing pitfalls.

Evidence-based hydration guide explaining daily fluid requirements. Learn body weight fluid formulas, climate and exercise sweat-loss adjustments, and fluid balance science.

Understand the Widmark formula used to estimate blood alcohol content, the factors that affect accuracy, legal BAC limits by country, and why BAC calculators are estimates rather than legal proof.

Science-backed guide to sleep architecture and ultradian sleep cycles. Learn NREM and REM stages, bedtime calculation math, individual sleep variations, and how to minimize sleep inertia.

Gratuity is a lump-sum thank-you from your employer for long service — but only if you clear the 5-year mark. Here is the exact formula and a worked payout example.

A Systematic Withdrawal Plan can turn your mutual fund corpus into a monthly paycheck. Here is how to set a withdrawal rate that does not run out.

Lumpsum and SIP investing win in different market conditions. We run a side-by-side ₹6 lakh example to show exactly when each strategy pulls ahead.

HRA can shield a big chunk of your salary from tax — but only if you calculate it correctly and keep the old regime. Here is the exact formula, with worked numbers.

Counting down to your next birthday involves more than a simple date subtraction, especially near year-end or leap years. Here is exactly how the math works.

Everyone assumes a coin flip is a perfect 50/50 split, but the real math and physics behind it are more nuanced than most people realize. Here is what actually determines the odds.