| What it does | Free calculators for sleep, mental wellbeing, recovery, fitness, nutrition and healthy living
| Free calorie calculator with TDEE, BMR, macros and nutrition tools based on published formulas
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| Pricing model | Free
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| Pricing | Not given
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| Key features | - Sleep Cycle Calculator for planning bedtimes based on 90-minute cycles
- Bedtime Calculator to find sleep time based on wake-up time and duration
- Wake-Up Time Calculator based on bedtime and sleep cycles
- Sleep Debt Calculator to estimate missed sleep over a week
- Caffeine Half-Life Calculator to estimate caffeine remaining in body
- How Much Sleep Do I Need Calculator with age-based estimates
- 20 calculator hubs across Sleep, Mind, Body, Family and Lifestyle categories
- Transparent formulas showing the math behind each result
- Evidence-based references citing primary sources
- Editorial and clinical review for sensitive health tools
| - BMR calculation using Mifflin–St Jeor formula
- TDEE calculation with activity factors
- BMI and body composition tools
- Calories burned during exercise
- Food database with nutritional values
- AI meal recognition from photos or text
- Recipe nutrition calculator
- No account or signup required
- 41 different calculation tools
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| What makes it different | - Private calculations in browser with no account required or personal data selling
- Transparent formulas and methodology for every calculator
- Evidence-based content citing primary sources not rewrites
- Regularly updated formulas with versioning and review dates
| - Published formulas with cited sources and no invented numbers
- Calculations run deterministically in TypeScript, not by language models
- Food database intentionally kept short to avoid generated content
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ● no change since last check | 5 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 7 |
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| Citation Flow (Majestic) | 10 | 24 |
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| Referring domains (Majestic) | 16 | 11 |
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WowSleepCalculator
CalculCalories