✅ Last updated: August 12, 2026
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BMI Calculator
Body mass index for adults
⚡Calorie Calculator
Daily calories to lose or gain weight
🥗Daily Calorie Intake
Calorie needs by goal and activity
🔥BMR Calculator
Basal metabolic rate at rest
🥦Macro Calculator
Protein, carbs, and fat split
🥩Protein Calculator
Daily protein requirement by goal
📏Body Fat Calculator
Body fat percentage estimate
🏋️Ideal Weight Calculator
Healthy weight for your height
💧Water Intake Calculator
Daily hydration needs
💪Lean Body Mass
Muscle and lean mass calculation
🏆One Rep Max Calculator
1RM strength calculator
😴Sleep Calculator
Best bedtime and wake-up time
🏃Running Pace Calculator
Min/mile and min/km pace
📆Ovulation Calculator
Fertile window and peak days
🤰Due Date Calculator
Pregnancy due date and milestones
Frequently Asked Questions
Yes, 100% free. No subscription, no credits, no watermark, no file size limit. Every tool on Calcus is free forever.
Completely. All processing happens in your browser. No files or data are sent to any server. Your inputs never leave your device.
Most tools work offline after the first load since they run entirely in JavaScript. Calculator tools, converters, and text tools all work without internet.