Fitness & Nutrition Calculators & Guides

Evidence-based articles and interactive calculators to help you understand TDEE, macros, body composition, and reach your health goals — all medically reviewed and free.

All Guides

Meal Planning•6 min read

1200 Calorie Meal Plan: Safe Sample Days, Macros & Critical Cautions

1200 calorie meal plans with sample days and high-protein macros. Who should and shouldn't eat 1200 calories, plus how to avoid metabolic damage.

Meal Planning•7 min read

2500 Calorie Meal Plan: 7-Day High-Protein Sample for Active Adults

2500 calorie meal plan with 200+ g protein for muscle gain or active maintenance. Sample days, macro breakdown, and shopping list.

Activity•5 min read

Calories Burned Cycling: Charts by Weight, Speed, Distance & Type

Calculate calories burned cycling by body weight, speed, and ride type. MET tables for road, mountain, indoor, commuting, and stationary bike.

Activity•5 min read

Calories Burned Running: Charts by Weight, Pace & Distance

Calculate calories burned running by body weight, pace, and distance. MET-based tables for jogging, easy runs, tempo, sprints, treadmill, and trail running.

Activity•5 min read

Calories Burned Walking: Charts by Weight, Pace, Steps & Distance

Calculate calories burned walking by body weight, pace, and steps. Tables for casual, brisk, hill, and treadmill walking with weight-loss strategies.

Meal Planning•7 min read

1500 Calorie Meal Plan: 7-Day Sample With Macros & Shopping List

Complete 1500 calorie meal plan with 7 days of meals, macros, prep tips, and shopping list. Built for sustainable fat loss with ≥120 g protein per day.

Meal Planning•8 min read

2000 Calorie Meal Plan: 7-Day High-Protein Sample With Macros

Complete 2000 calorie meal plan with 7 days of meals, 150+ g protein, macro breakdowns, and shopping list. Built for fat loss in active adults and recomposition.

Weight Loss•7 min read

How Many Calories to Lose Weight: Complete Calculator & Daily Targets

Calculate exactly how many calories to eat to lose weight at any rate. Daily calorie targets for 0.5, 1, and 2 lb per week with safe-deficit science and meal examples.

Macros•5 min read

Keto Macro Calculator: Optimal Protein, Carbs & Fat for Ketosis

Calculate keto macros with the right protein, carb cap, and fat target for your goals. Standard, cyclical, and targeted keto splits explained.

BMR•5 min read

Mifflin-St Jeor vs Harris-Benedict: Which BMR Formula Is More Accurate?

Side-by-side comparison of Mifflin-St Jeor and Harris-Benedict BMR formulas. Accuracy, errors, and which to use for your situation.

Special Populations•6 min read

TDEE for Men: Calorie Calculator, Charts & Male-Specific Targets

Calculate TDEE for men using Mifflin-St Jeor and Katch-McArdle. Male calorie needs by age, activity level, and goal — cutting, bulking, and recomposition.

Special Populations•7 min read

TDEE for Women: Calorie Calculator, Charts & Female-Specific Adjustments

Calculate TDEE for women using science-based formulas. Female calorie needs by age, activity level, and life stage including menstruation, pregnancy, and menopause.

TDEE•6 min read

TDEE vs BMR vs RMR: Definitions, Differences & Which to Use

TDEE, BMR, and RMR explained side by side. Definitions, measurement methods, accuracy, and which number to use for weight loss or muscle gain.

TDEE•19 min read

Activity Level Multipliers: Choose Your True TDEE Factor

Master TDEE activity multipliers from sedentary (1.2) to extreme (1.9) using step counts, MET values, and weekly exercise frequency.

Body Composition•11 min read

BMI Calculator: Charts, Ranges, Limitations & Better Alternatives

Free BMI calculator with health ranges by age and gender. Understand BMI limitations and discover better metrics like body fat % and waist-to-height ratio.

Body Composition•16 min read

Body Fat Percentage Calculator: Methods, Charts & Health Ranges

Calculate body fat percentage using Navy method, BMI-based, and skinfold formulas. Visual body fat charts for men and women plus health-range guidelines.

Recomposition•11 min read

Body Recomposition: Lose Fat & Build Muscle Simultaneously

Step-by-step body recomp protocol: maintenance calories, high protein (1g/lb), progressive overload, and tracking metrics that actually work.

Bulking•17 min read

Bulking Calculator: Lean Bulk Calorie & Macro Targets

Calculate optimal bulking calories with surplus targets, lean bulk macros, and muscle gain rates. Free bulking calculator for strategic muscle building.

Weight Loss•12 min read

Caloric Deficit Calculator: Safe Weight Loss Targets

Calculate a safe calorie deficit for sustainable weight loss. Evidence-based deficit ranges, plateau-busting protocols, and metabolic adaptation prevention.

Advanced•11 min read

Calorie Cycling & Refeed Days: Strategic Fat Loss Protocols

Advanced calorie cycling and refeed day protocols. Restore leptin, break plateaus, and improve adherence during long cuts.

Cutting•18 min read

Cutting Calculator: Fat Loss Calorie & Macro Targets

Calculate optimal cutting calories, deficit size, and macros for fat loss while preserving muscle. Free cutting calculator with phase planning.

Body Composition•13 min read

Lean Mass Calculator: Natural Muscle Building Limits & FFMI

Calculate fat-free mass index (FFMI), genetic muscle potential, and lean body mass targets. Discover natural muscle limits and realistic growth rates.

Recovery•12 min read

Metabolic Adaptation & Diet Breaks: Recovery Protocols

Science of metabolic adaptation, diet break protocols, and hormonal recovery. When and how to break a diet for long-term success.

Nutrition•14 min read

Protein Intake Calculator: Daily Protein Needs by Goal

Calculate optimal daily protein intake for muscle gain, fat loss, and athletic performance. Evidence-based recommendations by body weight, age, and activity.

Recovery•11 min read

Reverse Dieting Calculator: Restore Metabolism After Cutting

Calculate weekly calorie increases for reverse dieting after a cut. Restore metabolism, hormones, and energy without rebound fat gain.

TDEE•11 min read

TDEE Accuracy Guide: Tracking, Adjusting & Troubleshooting

Improve TDEE calculation accuracy with tracking methods, adjustment protocols, and individual variation analysis. Learn why your TDEE may differ.

Athletes•12 min read

TDEE for Athletes: Sport-Specific Calorie & Macro Targets

Sport-specific TDEE calculations for endurance, strength, and team sports. Periodization nutrition, training-day macros, and performance optimization.

Meal Planning•15 min read

TDEE Meal Planning: Sample Plans by Calorie Target

Convert your TDEE into practical meal plans. Sample 1500, 1800, 2000, 2500, and 3000-calorie days with macro breakdowns and prep strategies.

Special Populations•11 min read

TDEE for Pregnancy, Teens, Seniors & Special Populations

Adjusted TDEE calculations for pregnancy, breastfeeding, adolescents, seniors, and medical conditions like PCOS, thyroid disorders, and diabetes.

Hydration•15 min read

Water Intake Calculator: Daily Hydration Needs by Body Weight

Calculate optimal daily water intake based on weight, activity level, climate, and health factors. Hydration calculator with dehydration warning signs.

Weight Loss•14 min read

Breaking Weight Loss Plateaus: Complete Strategy Guide

Why weight loss plateaus happen and how to break them. Calorie recalc, refeeds, NEAT analysis, and plateau-busting protocols that work.