About Caloritix

Our mission

We started Caloritix because most calorie and macro calculators on the web hide behind sign-ups, paywalls or aggressive trackers. Our goal is simple: high-quality, beginner-friendly calculators that anyone can use in seconds, on any device, for free.

Calculators we offer

• TDEE Calculator — daily calorie needs (Mifflin–St Jeor)
• Macro Calculator — protein, carbs and fat in grams
• Calorie Deficit Calculator — safe weight-loss planning
• Body Fat Percentage Calculator — US Navy tape method
• Water Intake Calculator — daily hydration target
• One Rep Max Calculator — 1RM and training percentages
• Sleep Cycle Calculator — bedtime & wake times around 90-min cycles

Methodology

We use peer-reviewed, widely-cited formulas:

• TDEE & BMR: Mifflin–St Jeor equation, multiplied by an activity factor (1.2–1.9)
• Macros: 1.6 or 2.2 g/kg protein, ~25% calories from fat, remaining calories from carbs
• Calorie deficit: 7,700 kcal per kg of body fat, spread over your chosen timeframe
• Body fat: US Navy circumference method (waist, neck, hip)
• Hydration: 35 ml/kg baseline + ~12 ml/kg per hour of training + hot-weather bump
• 1RM: Epley as primary, Brzycki and Lombardi as cross-checks
• Sleep: 90-minute cycle model with an adjustable sleep-onset buffer

Editorial principles

• We don't make medical claims. Calculators give general estimates, not diagnoses or prescriptions.
• We disclose every formula and assumption so you can verify the math.
• We update content when new evidence or better methods become available.
• We aim for plain language any beginner can follow.

Privacy first

Every calculation runs locally in your browser. Your inputs are never sent to a server, and there's no account to create. The only thing we save is your preferred unit system (metric or imperial), so you don't have to switch every visit. Read more in our Privacy Policy.

Get in touch

Questions, corrections or a calculator we should add? Visit our contact page.