New category: Health Tools

MicroTools now has a dedicated Health Tools category — a home for tools that help you track, understand, and improve your physical wellbeing. All three launch tools are completely free and work entirely in your browser.

⚖️ BMI Calculator

Calculate your Body Mass Index with a visual speedometer gauge and a body silhouette indicator showing your current category (Underweight / Normal / Overweight / Obese). Supports both metric (cm/kg) and imperial (ft+in/lbs) units.

• Healthy weight range — see the exact weight range that falls within Normal BMI for your height.
• Target Weight Calculator — enter a target BMI and instantly see the weight needed to reach it.
• Calorie Needs Estimator — enter age, sex, and activity level to get your BMR and TDEE (daily calorie burn).

🔥 Calorie Calculator

Calculate your daily calorie needs using the Mifflin-St Jeor equation — the most accurate BMR formula for most adults. Select your goal (Lose Weight / Maintain / Gain Muscle) and get a personalised target.

• Macronutrient breakdown — grams of protein, fat, and carbs per day for your goal.
• Meal split — how to distribute calories across breakfast, lunch, dinner, and snacks.
• Calories burned chart — see how much common activities contribute to your daily expenditure.
• Water intake estimate — daily hydration target based on your weight and activity.
• Weight change timeline — project how long it takes to reach your goal weight.

😴 Sleep Cycle Calculator

Find the best time to wake up or go to bed based on 90-minute sleep cycles. Waking at the end of a cycle (light sleep) means you feel refreshed instead of groggy.

• Two modes: "I want to wake up at…" or "I need to sleep now" — both calculate optimal cycle-aligned times.
• Nap calculator — find the best nap length (20 min power nap, 90 min full cycle, etc.).
• Sleep debt tracker — log your recent sleep and see how much recovery you need.
• Chronotype detector — find out if you're a morning lark, evening owl, or somewhere in between.
• Sleep stage breakdown — understand how much REM, deep, and light sleep you get per cycle count.