| What it does | Date, deadline and time calculators with visible assumptions and sources
| Free professional construction calculators for contractors, DIYers and architects
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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
| - 45 specialized trade calculators
- Real-time calculation updates as you type
- PDF and Excel export with company branding
- Adjustable waste factors on all calculators
- Material rate library with regional presets
- Multi-language support in 13 languages
- Mobile-friendly responsive design
- Works offline entirely in browser
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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
| - No sign-up, no account required
- Privacy-first: all calculations run locally in browser
- Industry-standard formulas from ACI, NEC, and IRC codes
- Professional exports ready for client bids and supplier orders
- Customizable material rates that sync across all calculators
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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 | 13 |
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| Referring domains (Majestic) | 0 | 1 |
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CalcSpan
BuildingCalc