| What it does | Free recessed lighting calculator for can light layout and spacing
| Free Karvonen formula heart rate zone calculator
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| Stage | Not given
| Established
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 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
| - Five personalized training zones based on heart rate reserve
- Accounts for resting heart rate and cardiovascular fitness
- Custom maximum heart rate input from multiple formulas
- No signup required, runs entirely in browser
- Weekly resting heart rate logging and progress tracking
- Zone-specific training guidance for different goals
- Shareable and printable zone results
- Embeddable calculator widget for websites
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| What makes it different | - 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
| - More accurate than age-only formulas, accounting for individual cardiovascular fitness
- Zones adapt as your fitness improves and resting heart rate drops
- Based on 1957 Karvonen research used by coaches and sports scientists
- Independent, no data collection or external servers
- No ads inside the calculator, free to use with optional embedding
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 2 ● no change since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 19 |
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| Citation Flow (Majestic) | 15 | 25 |
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| Referring domains (Majestic) | 2 | 40 |
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CalculateMyHeartRate