About Health Calculators

Health Calculators is a free, open-access collection of 7 utilities built for speed and privacy. Every tool runs entirely in your browser — no data is ever sent to our servers, logged, or stored.

Our Philosophy

• Local-first: All computation happens on your device using browser APIs.
• No login required: Open a tool, use it, done.
• No tracking of inputs: Your data stays on your machine.
• Fast: Static pages with no server round-trips.

Available Tools

• TDEE Calculator — Calculate Total Daily Energy Expenditure based on weight, height, age, and activity.
• BMR Calculator — Calculate Basal Metabolic Rate using Mifflin-St Jeor equation.
• Macro Calculator — Calculate daily protein, carbohydrate, and fat targets from TDEE.
• Ideal Weight Calculator — Calculate ideal body weight range based on height and gender.
• BAC Calculator — Estimate blood alcohol content based on drinks, weight, and time.
• Water Intake Calculator — Calculate daily water intake needs based on weight and activity level.
• Pregnancy Due Date — Calculate estimated due date from last menstrual period or conception date.

Quality Policy

Each tool is tested against common edge cases. We prioritize correctness over feature bloat. If you find a bug, please contact us so we can fix it promptly.