| What it does | Free online calculators for math, finance, health, pregnancy, and more
| Date, deadline and time calculators with visible assumptions 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 | - BMI calculator for health assessment
- Ovulation and pregnancy tracking calculators
- Percentage and fraction calculations
- Loan and mortgage financial calculators
- Construction calculators for measurements
- Unit conversion tools
- FFMI and body composition analysis
- Instant results with no processing delays
| - 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
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| What makes it different | - Completely free with no signup or registration required
- Privacy-focused with local browser processing
- Accurate calculations based on industry-standard formulas
- 73 calculators across multiple categories
- Clean and intuitive user interface
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 3 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 13 | 0 |
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| Referring domains (Majestic) | 1 | 0 |
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InstantCalcs
CalcSpan