| What it does | Free Coast FIRE calculator to estimate your retirement savings milestone
| Compare fees across 8 marketplaces to see what you'll actually keep when you sell
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| Stage | Startup
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| Founded | 2026
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| Based in | Not given
| US
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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
| - Compare fees across 8 marketplaces at once
- Includes shipping costs and sales tax in calculations
- US state-by-state sales tax rates for all 50 states
- Fee rates checked against official platform pages in October 2026
- Shows what you actually keep after every fee
- Works on mobile while you list items
- Individual platform fee calculators
- Platform comparison tools
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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
| - Accounts for how each platform charges fees on shipping and sales tax differently
- Shows exact amounts you keep, not just percentages
- Fees verified against platforms' official documentation
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| Community votes | 0 | 0 |
| DR (Domain Rating by Ahrefs) | 6 ● no change since last check | Not checked yet ● no change since last check |
| Trust Flow (Majestic) | 10 | 0 |
| Citation Flow (Majestic) | 20 | 0 |
| Referring domains (Majestic) | 12 | 0 |