| What it does | Free attendance calculator for students to track how many classes they can safely miss
| Free recessed lighting calculator for can light layout and spacing
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | 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
| - 2D layout preview with heatmap and beam coverage visualization
- Customizable room dimensions, ceiling height, and calculation plane
- LED and traditional fixture specifications from manufacturer sources
- Export layouts as PNG image, CSV coordinates, or printed report
- Grid layout presets and custom row/column adjustment
- Calculations run locally in browser with no data sent to server
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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
| - Source-checked fixture specifications from manufacturer datasheets
- Simplified lumen-method calculation with transparent assumptions and methodology
- All inputs and calculation methods documented with published sources
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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 | 2 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 2 |
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| Citation Flow (Majestic) | 19 | 15 |
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| Referring domains (Majestic) | 3 | 2 |
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CalcAttendance