| What it does | Free online calculators for finance, health, dates, and everyday math
| 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 | - 19 calculators across health, finance, math and everyday categories
- Client-side calculations with no server data transmission
- Transparent formulas and calculation methodology
- Health calculators follow WHO and CDC standards
- Financial tools use standard industry formulas and current IRS tax brackets
- Fully responsive and works on desktop, tablet and smartphone
- No signup required or account creation needed
- Lightweight and fast with no tracking scripts
| - 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 | - All calculations run entirely in your browser with no data sent to servers
- Transparent formulas so you understand how results are calculated
- Health formulas endorsed by WHO and CDC standards
- Instant results with no loading screens or popups
| - 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) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 0 |
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| Referring domains (Majestic) | 0 | 0 |
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CalcDeep
CalcSpan