| What it does | Date, deadline and time calculators with visible assumptions and sources
| 200+ free online calculators for finance, health, math, and more with no sign-up required
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| Stage | Not given
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| Founded | Not given
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| Based in | US
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 184 calculators across 53 categories
- Shows counting rules and assumptions with each result
- Local-first processing with no data sent to servers
- Holiday and weekend calendar selection
- Business day counting
- Date arithmetic (add or subtract days, weeks, months, years)
- Sleep cycle planner with NIH-based 80-100 minute cycles
- Time zone conversion with DST handling
- Save results as images or add to calendar
- Schengen visa 90/180 day rolling window auditing
| - Finance calculators including loans, taxes, investments, and budgeting
- Health calculators for BMI, calories, pregnancy, and wellness
- Education and GPA calculators for university graders and exam scores
- Construction and materials calculators for concrete, lumber, and costs
- No sign-up required to use any calculator
- Clear inputs and results with estimates labeled
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| What makes it different | - Shows the source and counting rule beside every answer
- No sign-up or account required to use any calculator
- All inputs stay in your browser for privacy
- Comprehensive coverage across 53 life and work categories
- Higher-risk calculators include prompts to verify with professionals
| - Over 200 free calculators in one place
- Always free with no account or sign-up needed
- Organized by category for easy navigation
- Built and maintained by one person with AI assistance
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 8 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 5 |
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| Citation Flow (Majestic) | 0 | 20 |
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| Referring domains (Majestic) | 0 | 7 |
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CalcSpan