Health guide library
Health guides that make calculator results easier to use.
These guides explain the ideas behind WellnessCalcs tools: calories, macros, hydration, BMI, body composition, and pregnancy dating.
Not just links
A guided library for common health estimates.
Calculator pages answer a direct question, but many users need more context before they can act on a number. This library organizes that context by topic and links each guide back to a relevant calculator.
Every guide is designed to explain what a result means, what can make it less reliable, which next steps are reasonable, and when professional guidance is the safer choice.
All guides
Browse by topic
Start with the guide closest to your question, then use the related calculator after reading the limitations.
How Many Calories Should I Eat?
Understand maintenance calories, deficits, surpluses, and realistic calorie adjustments.
Energy guideWhat Is TDEE?
Learn how total daily energy expenditure works and why it changes.
Energy guideBMR vs TDEE
See how resting calories differ from full daily calorie needs.
Macros guideMacro Ratios for Weight Loss
Learn how protein, carbohydrates, and fat can fit into a fat-loss plan.
Protein guideHow Much Protein Per Day?
Understand protein targets for general fitness and weight management.
Weight loss guideHealthy Weight Loss Pace
Learn why slower, consistent progress is usually more sustainable.
Hydration guideHow Much Water Should I Drink?
See what affects hydration needs and how to adjust intake.
BMI guideBMI Categories Explained
Understand underweight, normal range, overweight, and obesity ranges.
BMI guideBMI Limitations
Learn why BMI is a screening tool, not a diagnosis.
Pregnancy guideHow Pregnancy Due Dates Are Calculated
Understand LMP, conception date, IVF transfer date, and why due dates can change.
Pregnancy guidePregnancy Trimesters Explained
Understand the three pregnancy stages and common milestones.
Pregnancy guideLMP vs Conception Date
Compare common pregnancy dating methods.
Body composition guideBody Fat Percentage Explained
Understand body fat percentage estimates and limitations.
Body composition guideWaist-to-Height Ratio Guide
Learn how waist-to-height ratio can add context beyond weight.
Weight loss guideCalorie Deficit Guide
Learn how a calorie deficit works and how to avoid extreme dieting.
When calculator results should not be trusted alone
Do not rely on a calculator alone when symptoms, pregnancy care, medication, eating disorder history, chronic disease, fluid restriction, or urgent health concerns are involved. In those cases, use the page only as background education and get professional guidance.