| What it does | Free attendance calculator for students to track how many classes they can safely miss
| 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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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculate how many remaining classes can be missed while staying at target
- Determine how many consecutive sessions must be attended to recover if below threshold
- Track attendance for multiple subjects separately
- Browser-based with no sign-up or account required
- All calculations performed locally without sending data to servers
| - 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 | - No account or sign-up needed – instant access with no data collection
- All calculations happen in your browser – attendance data never leaves your device
- Supports multiple institutional requirements with 75%, 80%, 85%, and 90% target options
- Tracks multiple subjects simultaneously to prevent any single module from sliding below threshold
- Built and maintained by a single developer focused on honest, accurate answers
| - 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) | 1 | 0 |
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| Citation Flow (Majestic) | 19 | 13 |
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| Referring domains (Majestic) | 3 | 1 |
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CalcAttendance
BuildingCalc