| What it does | Free, real-time 401(k) calculator showing contributions, employer match and compound growth
| 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 | - Live, real-time calculations that update as you type
- Breaks down balance into contributions, employer match and investment growth
- No signup or account required
- All calculations run in the browser with no data stored
- Updated for 2026 IRS contribution limits
- 11 focused calculators for different 401(k) scenarios
- Visual chart showing balance growth over time
- Employer match calculator
- Roth vs traditional comparison tool
- Early withdrawal penalty calculator
| - 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 | - Fully transparent formulas shown for every calculation
- IRS-accurate calculations verified against official guidance
- No advertising or sponsored products
- Complete privacy with client-side-only calculations
- Worked examples showing calculations step-by-step
| - 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) | 7 ● no change since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 17 | 2 |
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| Citation Flow (Majestic) | 10 | 15 |
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| Referring domains (Majestic) | 19 | 2 |
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401k Calculator