| What it does | Free Coast FIRE calculator to estimate your retirement savings milestone
| Free concrete slab cost estimator with material, labor and site prep breakdowns
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| Stage | Startup
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| Founded | 2026
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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 | - Calculate invested assets needed today for Coast FIRE milestone
- Interactive calculator with real-time updates as you edit inputs
- Compare multiple contribution scenarios with projected retirement assets
- Explore return assumptions with sensitivity analysis
- Five related FIRE calculators: Coast, Barista, Fat, Lean, and FIRE Number
- Customize metro area budget or enter your own annual spending
- Transparent formulas and documented verification checks
- All calculations performed in browser with no data uploads
| - Material, labor and delivery cost breakdowns
- Pre-calculated costs for common slab sizes
- Multiple calculator tools including rebar, yard, bag and footing
- No sign-up required, data stays in browser
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| What makes it different | - Free with no account required and calculations run entirely in your browser
- Transparent assumptions with linked original research and sources
- Deterministic scenarios and educational model focused on inspection and understanding
- Multiple complementary calculators for different retirement planning questions
- Public correction process and documented model updates
| - Built by a single independent developer focused on accessible, ad-free calculation tools
- Transparent calculations using standard formulas so users see exactly how each number is produced
- Multiple concrete calculation tools sharing one consistent calculation engine
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 7 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 20 | 16 |
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| Referring domains (Majestic) | 12 | 4 |
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