Fitness

Compare lean body mass and body fat percentage formulas, understand why LBM matters for protein and medication dosing, and see healthy body fat percentage ranges by sex and age.

Learn the pace formula runners use to convert between min/km and min/mile, plus a full reference table converting pace to finish times for 5K, 10K, half marathon, and marathon distances.

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.

Calories tell you how much to eat; macros tell you what to eat it as. Learn how to split any calorie target into protein, carb, and fat grams for fat loss.

Fasting, post-meal, random, and HbA1c blood sugar tests each measure something different. Here is the complete normal-vs-prediabetic-vs-diabetic chart for all four.

A blood pressure reading of "120/80" means nothing until you know the categories. Here is the full AHA chart, how ranges shift with age, and when a number becomes an emergency.

LCM and HCF are two of the most tested concepts in school maths. Learn the prime factorization method, the fast division shortcut, and where these numbers actually show up in real life.

Applying abroad with an Indian CGPA? Here is how the US 4.0 GPA scale works and how to convert your Indian marks so admissions officers understand them.

A BMI of 25 is "overweight" for a Western adult, but research shows South Asians carry significantly more body fat at the same BMI — and face higher metabolic risk. The WHO recognises lower BMI thresholds for Asians. Here is what the research says and why it matters.

Sleep science is clear: most adults need 7–9 hours. But the exact amount depends on your age — and more important than hours is timing your wake-up to the end of a 90-minute sleep cycle. Here is what the research says and how to use a sleep calculator.

Your maximum heart rate determines your five training zones — from fat-burning to peak performance. The old 220-minus-age formula is outdated. Here is the more accurate Tanaka formula, a zone table for every age, and how to use each zone.