| What it does | Free online calculator for exact age in years, months and days
| Independent calculator to check if a home battery pays for itself in your situation
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| NL
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculate exact age in years, months, and days
- Age on specific test date
- Display birthstone and zodiac sign
- Calculate total days alive
- Specialized calculators for speech therapy and child assessment
- Corrected age calculator for premature babies
- Calculate age difference between two people
- Local browser-based calculation with no server submission
| - Compares battery models from 23 brands on payback time and net result after 15 years
- Calculates with real hourly EPEX prices for dynamic energy contracts
- Processes the end of net metering from 1 January 2027
- Provides negative buying advice if purchase is not worthwhile
- No account or email required
- Generates 10-page PDF advice report with lowest prices from 11 shops
- Free 22-page PDF handbook about home batteries
- Analyzes consumption and solar generation hour by hour for full year
- Three scenarios: pessimistic, most likely and optimistic outcomes
- Updates prices from 11 online shops every morning automatically
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| What makes it different | - Handles calendar complexities automatically including leap years and varying month lengths
- No data submission to servers; calculations performed locally in browser
- Independent tool with no affiliation to test publishers or official scorers
| - Truly independent: sells no batteries, has no arrangements with installers, publishes negative buying advice
- No personal data collection: zero signup required, immediate results without email
- Built from personal need: creator did his own calculations after a misleading sales pitch
- Comprehensive research: 384 example households analyzed in 26,112 calculations
- Shows all calculation assumptions: transparent methodology with public data sources
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 13 ● no change since last check | 16 ● no change since last check |
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| Trust Flow (Majestic) | 3 | 18 |
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| Citation Flow (Majestic) | 20 | 24 |
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| Referring domains (Majestic) | 25 | 18 |
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Chronological Age Calculator
Eerlijk over Thuisbatterijen