| What it does | Free calculators for sleep, mental wellbeing, recovery, fitness, nutrition and healthy living
| Daily score tool for measuring productive time and planning your workday
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| Pricing model | Free
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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
| - Productivity Score calculation from work and productive time
- Perfect End Time planning with billable minutes and productivity targets
- Advanced options for meeting time, distraction tracking, and deep work analysis
- Productivity levels and interpretation guidance
- Local browser storage with Remember my settings option
- Support for multiple use cases including therapy, studying, and team planning
- Calculator library with nine specialized 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
| - No sign-up required to use the calculator
- Transparent methodology with formulas shown in the tool
- Inputs processed in browser for privacy
- Practical focus on real-world metrics over generic advice
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ● no change since last check | 25 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 7 |
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| Citation Flow (Majestic) | 10 | 27 |
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| Referring domains (Majestic) | 16 | 44 |
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WowSleepCalculator
Productivity Calculator