| What it does | Free calculators for sleep, mental wellbeing, recovery, fitness, nutrition and healthy living
| Paycheck, tax and money calculators with formulas and sources
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| US
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| Pricing model | Free
| 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
| - Paycheck calculators for all 50 states and DC
- Federal income tax and W-4 withholding calculators
- Savings, retirement, credit and loan calculators
- Roth IRA calculator
- CD calculator
- Savings calculator with compound interest
- Mortgage payoff calculator
- Loan payment calculator
- Credit card payoff calculator
- Dividend calculator
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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
| - Shows all formulas and cites official sources
- Calculations run entirely in browser without collecting personal data
- Updated annually with current tax year data
- Explains assumptions and provides reproducible examples
- Free with no ads or product sales
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ● no change since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 7 |
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| Citation Flow (Majestic) | 10 | 23 |
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| Referring domains (Majestic) | 16 | 14 |
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WowSleepCalculator
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