Health Tools
Free online health calculators and trackers. BMI, body fat, calorie needs, keto macros, water intake, running pace, pregnancy due date, temperature tracker — private and instant.
Health and wellness calculators using established medical formulas: BMI (weight classification), Body Fat Percentage (US Navy method), Calorie & TDEE (Mifflin-St Jeor BMR), Keto Macros (targeted macro splits), Water Intake (weight/activity/climate-based), and Pace Calculator (run splits for 5K through marathon). No health data is stored, transmitted, or tracked — everything stays local. Key tools: Calorie & TDEE Calculator with macro targets, Body Fat Calculator with gender-specific measurements.
Health Metrics at Your Fingertips
Understanding your health starts with knowing your numbers. ToolStand health tools provide science-backed calculations for body composition, nutrition, hydration, fitness, and wellness. Each tool uses established medical formulas and provides clear, actionable results without storing or transmitting any personal health data.
Privacy Commitment
Health data is among the most sensitive personal information. ToolStand health tools process everything client-side — your weight, height, age, measurements, and other inputs never leave your browser. There is no server to hack, no database to leak, and no third party to sell your data to. This is fundamentally different from most health apps and websites that collect, store, and monetize your health information.
Integrated Health Tracking
The health tools work together as a system. Calculate your BMI, then get your body fat percentage for a more complete body composition picture. Find your TDEE and macro targets, then use the keto calculator for specialized diet planning. Calculate your water intake needs and running pace. Log body temperature trends with the temperature tracker. Each tool informs the others, giving you a holistic view of your health.
All Health Tools on ToolStand
- BMI Calculator — Body Mass Index with classification. Instant results, no data storage.
- Body Fat Calculator — US Navy method. Gender-specific with neck, waist, and hip measurements.
- Calorie & TDEE Calculator — Mifflin-St Jeor BMR, activity multipliers, macro breakdown.
- Keto & Macro Calculator — Keto-specific macros with BMR, TDEE, and doughnut chart.
- Water Intake Calculator — Daily hydration needs based on weight, activity, and climate.
- Pace & Running Calculator — Pace, time, distance with race splits. 5K through marathon.
- Due Date Calculator — Estimate pregnancy due date. No sign-ups, fully private.
- Temperature Tracker — Log body temp, chart trends, export CSV. Fever alerts.
- Decibel Meter — Measure sound levels. Hearing protection and noise monitoring.
How to Choose the Right Health Tool
Health tools span body composition metrics, daily wellness tracking, and activity measurement. Choose based on which aspect of health you're monitoring.
Body Composition & Nutrition
| Goal | Best Tool | Why |
|---|---|---|
| Quick weight classification | BMI Calculator | WHO categories, metric/imperial, instant result |
| Body fat estimate | Body Fat Calculator | US Navy formula, gender-specific measurements |
| Daily calorie target | Calorie & TDEE | Mifflin-St Jeor BMR + activity multipliers |
| Keto macro planning | Keto & Macro | Custom fat/protein/carb ratios, doughnut chart |
Daily Wellness & Tracking
| Goal | Best Tool | Why |
|---|---|---|
| Hydration target | Water Intake | Weight + activity + climate based |
| Track body temperature | Temperature Tracker | Log readings, chart trends, CSV export, fever alerts |
| Pregnancy due date | Due Date Calculator | Naegele's rule, fully private — no data stored |
Activity & Environment
| Goal | Best Tool | Why |
|---|---|---|
| Running pace & splits | Pace & Running | 5K through marathon, race splits |
| Measure noise levels | Decibel Meter | Hearing protection, classroom/event monitoring |
These tools provide estimates based on established formulas. They are not substitutes for professional medical advice, diagnosis, or treatment. See also: calculators pillar for finance and everyday math tools.
Frequently Asked Questions
How do I track health trends over time — can I combine multiple tools into a wellness dashboard?
ToolStand's health tools are designed for individual calculations, not a unified dashboard. But you can build your own tracking system: use the Temperature Tracker to log daily readings with CSV export (importable into Excel or Google Sheets). For weight and body composition, track BMI from the BMI Calculator and body fat from the Body Fat Calculator on a weekly basis — record results manually or screenshot the outputs. The key insight: combine the calculators for a snapshot, and the temperature tracker for trend data over time.
What's the difference between BMR, TDEE, and RMR — which does the Calorie Calculator use and which should I follow?
BMR (Basal Metabolic Rate) is calories burned at complete rest — think lying in bed all day. RMR (Resting Metabolic Rate) is similar but slightly higher, measured under less strict conditions. TDEE (Total Daily Energy Expenditure) is BMR multiplied by your activity level — this is what you actually burn. The Calorie & TDEE Calculator uses the Mifflin-St Jeor equation for BMR (the most accurate formula per the Academy of Nutrition and Dietetics), then applies activity multipliers for TDEE. For weight loss, eat below TDEE; for maintenance, eat at TDEE; for bulking, eat above.
Due Date Calculator — what method does it use and how accurate is the estimate?
The Due Date Calculator uses Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is the standard method used by obstetricians worldwide. Accuracy: about 4-5% of babies arrive exactly on the due date — most arrive within ±2 weeks. The calculator also shows the current week of pregnancy and trimester. It is an estimation tool — your healthcare provider will refine the date based on ultrasound measurements. All data stays in your browser; no pregnancy information is stored or transmitted.
Decibel Meter — what noise levels are actually dangerous, and when should I use hearing protection?
The Decibel Meter uses your device's microphone to measure sound pressure level. Safety guidelines: below 70 dB — safe indefinitely; 70-85 dB — potentially annoying but unlikely to cause damage; 85-100 dB — hearing damage possible with prolonged exposure (lawnmower, motorcycle); 100-120 dB — damage possible within minutes (concert, jackhammer); above 120 dB — immediate damage risk (jet engine, gunshot). Use hearing protection above 85 dB for sustained exposure. Note: phone microphones aren't calibrated lab instruments — the meter is accurate to approximately ±5 dB, sufficient for general awareness but not for compliance measurements.
Can I combine multiple health metrics — BMI, body fat, and calorie targets — for a complete fitness assessment?
Yes, and this is the recommended approach. Start with the BMI Calculator for a broad weight classification, then refine with the Body Fat Calculator (BMI doesn't distinguish muscle from fat — a muscular person can have a high BMI but low body fat). Then input your stats into the Calorie & TDEE Calculator for your daily energy target. If following keto, use the Keto & Macro Calculator to translate that calorie target into specific fat, protein, and carb grams. These tools are complementary — each adds a layer of precision to your health picture.
Keto Calculator — how do I adjust macros for different types of ketogenic diets?
The Keto & Macro Calculator computes BMR and TDEE, then applies macro splits. For Standard Keto (SKD): the default 70% fat / 25% protein / 5% carbs. For Targeted Keto (TKD): eat those same macros but add 25-50g carbs around workouts — input a slightly higher carb percentage. For Cyclical Keto (CKD): the calculator shows your standard keto baseline; on carb-up days (typically 1-2 days per week), manually increase carbs to 60-70% while reducing fat. The calculator gives you the foundation — adjust based on how your body responds and consult a nutritionist for personalized plans.