❤️ Health & Fitness
Track body metrics and everyday wellness — BMI, body fat, calories and macros, hydration and running pace, all calculated privately on your device.
10 free tools across 2 categories.
Body Metrics & Nutrition (6 tools)
BMI Calculator
Check your Body Mass Index instantly with WHO classification. Metric & imperial units, privacy-first.
Body Fat Calculator
US Navy body fat % formula. Gender-specific, fitness assessment.
Calorie & TDEE Calculator
Daily calorie needs, TDEE, macros. BMR calculation.
Keto & Macro Calculator
Calculate keto macros. BMR, TDEE, doughnut chart.
Pace & Running Calculator
Running pace, time, distance. 5K, 10K, marathon splits.
Water Intake Calculator
Daily water needs based on weight, activity, climate.
Health & Lifestyle (4 tools)
How to Choose the Right Tool
| Your goal | Use this tool |
|---|---|
| Check weight classification (BMI) | BMI Calculator |
| Estimate body fat percentage | Body Fat Calculator |
| Calculate daily calorie and TDEE needs | Calorie & TDEE Calculator |
| Plan keto macro targets | Keto & Macro Calculator |
| Calculate running pace and race splits | Pace & Running Calculator |
| Track body temperature with CSV export | Temperature Tracker |
Frequently Asked Questions
What's the difference between BMR, TDEE, and RMR — which does the Calorie Calculator use?
BMR (Basal Metabolic Rate) is calories burned at complete rest. 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 daily. 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.
How accurate is the Body Fat Calculator compared to a DEXA scan?
The Body Fat Calculator uses the US Navy method — a validated circumference-based formula using neck, waist, and hip measurements (gender-specific). It provides a reliable estimate for tracking trends and fitness assessment, with typical accuracy within ±3-4% of DEXA for most individuals. It is not a replacement for clinical body composition analysis but is considered one of the more accurate field methods available without specialized equipment.
Due Date Calculator — what method does it use and how accurate is the estimate?
The Pregnancy Due Date Calculator uses Naegele's rule: add 280 days (40 weeks) to the first day of the last menstrual period. Only about 4% of births occur on the exact due date — it's an estimate, with most births occurring within ±2 weeks. The calculation is performed entirely in your browser with no data stored, making it a private, no-sign-up reference tool.
How do I track health trends over time — can I combine multiple tools?
ToolStand's health tools work individually, not as 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 body composition, track BMI from the BMI Calculator and body fat from the Body Fat Calculator weekly — record results manually or screenshot the outputs. The key approach: use calculators for periodic snapshots and the temperature tracker for continuous trend data.
Keto Macro Calculator — how are the macro targets determined?
The Keto & Macro Calculator first computes your BMR and TDEE (same Mifflin-St Jeor foundation as the Calorie Calculator), then applies keto-specific macronutrient ratios — typically 70-75% fat, 20-25% protein, and 5-10% carbohydrates. You can customize these ratios based on your specific keto variant (standard, high-protein, cyclical). Results display as a doughnut chart showing grams and calories per macro, making it easy to translate targets into meal planning.