Lean Body Mass Calculator: Formulas, Worked Examples, and What LBM Actually Tells You Quick answer: A lean body mass calculator estimates the weight of everything in your body except fat — muscle, bone, organs, and water — using either your body fat percentage or a validated formula like Boer, Hume, or James based on height … Read more
Running Pace Calculator: Predict Race Times and Find Your Training Zones Quick summary: A running pace calculator predicts your finish time at any race distance using Riegel’s formula — T₂ = T₁ × (D₂/D₁)^1.06 — and calculates your ideal training paces using Jack Daniels’ VDOT system, which breaks training into five zones: Easy, Marathon, Threshold, … Read more
Pace Calculator: How to Find Your Running Pace Per Mile or Kilometer Quick summary: A pace calculator divides your total running time by the distance covered to give you a time-per-distance figure, usually expressed in minutes per mile or minutes per kilometer. Pace is the inverse of speed — a lower pace number means you’re … Read more
Ovulation Calculator: How to Find Your Fertile Window Accurately Quick summary: An ovulation calculator estimates your ovulation date by subtracting the average 14-day luteal phase from your predicted next period, then marks your fertile window as the 5 days before ovulation plus the day of ovulation itself. The formula works best for people with regular … Read more
Overweight Calculator: How to Check Your Weight Status Using BMI Quick summary: An overweight calculator uses the Body Mass Index (BMI) formula — weight in kilograms divided by height in meters squared — to estimate whether your weight falls into the underweight, normal, overweight, or obese category. According to the CDC, adults are classified as … Read more
Protein Calculator: How Much Protein Do You Really Need Per Day? Quick summary: A protein calculator estimates your daily protein needs based on body weight, activity level, and goals — ranging from 0.8 grams per kilogram for sedentary adults up to 2.0+ grams per kilogram for athletes building muscle or cutting fat. This guide breaks … Read more
Pregnancy Weight Gain Calculator: IOM Guidelines, Charts, and Worked Examples Quick summary: A pregnancy weight gain calculator tells you the medically recommended range of weight to gain during pregnancy based on your pre-pregnancy BMI, using guidelines from the Institute of Medicine (IOM) and endorsed by ACOG. This guide walks through the exact BMI-based ranges, trimester-by-trimester … Read more
Pregnancy Conception Calculator: How to Estimate Your Conception Date Quick summary: A pregnancy conception calculator estimates when you likely conceived by working backward from your due date, last menstrual period, or ultrasound results — most commonly using the standard 266-day rule. This guide explains the formulas behind conception dating, walks through worked examples, and covers … Read more
Healthy Weight Calculator: BMI-Range Formula & Complete Guide Written by Mathew | Financial Tools & Calculation Specialist · Last updated July 31, 2026 In two sentences: A healthy weight calculator gives you a full weight range — not a single number — by applying the WHO’s healthy BMI range (18.5 to 24.9) to your specific … Read more