USE THIS CATEGORY WELL
What these health tools help you work out
Use recent measurements taken in the way the tool requests and treat a result as one data point. Age, medication, disability, training history, pregnancy, medical conditions, measurement error, and personal goals can change what a number means. Seek urgent care for urgent symptoms; discuss a concerning result or a planned change to food, activity, alcohol, or pregnancy care with a qualified clinician.
- How do BMI, body-fat estimates, body surface area, lean mass, and ideal-weight formulas describe entered measurements?
- What energy, macronutrient, pace, heart-rate, or sleep-cycle estimate follows from the stated assumptions?
- How do last-menstrual-period calculations produce gestational-age, conception, or due-date estimates?
- Why do BAC and kidney-function estimates need careful interpretation rather than self-management?
CHOOSING A TOOL
Start with the question, not the calculator name
Choose a body-composition or energy tool for the question it actually asks. BMI, body-fat equations, ideal-weight formulas, and calorie estimates use different inputs and should not be treated as interchangeable measures of health.
Use pace and target-heart-rate tools for conservative activity planning, not to override symptoms, a clinician’s restrictions, or device alerts. Stop and seek care for warning symptoms such as chest pain, fainting, severe shortness of breath, or signs of heat illness.
Pregnancy tools estimate dates from the entered menstrual information. Use the dates from your maternity team when available. BAC is never a fitness-to-drive test: do not drive after drinking or rely on a calculator to make that choice.
UNITS, CURRENCY & INPUTS
Keep the assumptions consistent
Enter height, weight, distance, time, and energy in the unit requested, and convert once rather than mixing systems. Calories are dietary kilocalories in common food labeling; they are not a currency or a measure of nutrient quality.
Health tools do not access records, laboratory results, medications, wearable data, local emergency services, or live clinical guidance. Protect personal information and use a clinician or emergency service for care decisions.