{"uid":"cap_qmXkLp7kve5cmgVIVGi9Z","slug":"sindri-fat-fire-calculator-5ff82d2d","name":"Sindri Fat FIRE Calculator","description":"Fat FIRE calculator. Same year-by-year compound-growth simulation as the standard FIRE calculator, framed for a higher, more lifestyle-preserving retirement spending target.","url":"https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/fatFireCalculator?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"swr":{"type":"number","default":0.04,"description":"Safe withdrawal rate, as a fraction. Default 0.04."},"currentAge":{"type":"number","description":"Your current age in years."},"inflationRate":{"type":"number","default":0.03,"description":"Expected annual inflation rate, as a fraction. Default 0.03."},"currentNetWorth":{"type":"number","description":"Current invested net worth."},"currentAnnualIncome":{"type":"number","description":"Current annual take-home income."},"investmentReturnRate":{"type":"number","default":0.07,"description":"Expected annual investment return, as a fraction. Default 0.07."},"currentAnnualSpending":{"type":"number","description":"Current annual spending."},"retirementAnnualSpending":{"type":"number","description":"Target (higher) annual spending in retirement."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ydmvygfrXIAUz5gdUs_ka","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Simulates year-by-year compound net worth growth to project when a user can retire at a higher, lifestyle-preserving spending target using the Fat FIRE framework.","exampleAgentPrompt":"I'm 35, have $400,000 invested, take home $180,000 a year, currently spend $90,000 a year, and want to retire spending $200,000 a year. Assuming 7% investment returns, 3% inflation, and a 4% safe withdrawal rate, run a Fat FIRE simulation and tell me when I can retire.","exampleUseCases":[{"title":"High earner planning luxury retirement","prompt":"I'm 40 years old, have $600k saved, earn $220k a year take-home, spend $110k now, and want to retire spending $250k a year. Using 7% returns, 3% inflation, and a 4% withdrawal rate, tell me when I can Fat FIRE."},{"title":"Dual income couple targeting Fat FIRE","prompt":"We're both 32, have $300,000 combined invested, bring in $160,000 a year after taxes, spend $80,000, and want to retire on $180,000 a year. Can you run a Fat FIRE projection with standard 7% returns and 3% inflation?"},{"title":"Mid-career professional stress-testing assumptions","prompt":"I'm 45 with $900k invested, $200k annual income, $120k annual spending, and a $220k retirement spending goal. What happens to my Fat FIRE timeline if I use a more conservative 5% return instead of 7%, keeping inflation at 3% and SWR at 4%?"}],"resultDescription":"Returns a year-by-year projection of net worth growth showing when the user's invested assets reach the Fat FIRE number (retirement spending target divided by safe withdrawal rate), including the projected retirement age and number of years to reach Fat FIRE given current savings rate and investment return assumptions.","failureModes":["Missing required fields (currentAge, currentNetWorth, currentAnnualIncome, currentAnnualSpending, retirementAnnualSpending) returns a validation error","Retirement spending target lower than or equal to current spending may behave unexpectedly or mirror standard FIRE output","Unrealistic return rates (e.g. 0 or negative) may produce infinite or no retirement date","If savings rate is negative (spending exceeds income), simulation may never converge","Network or Lambda cold-start timeout on rare occasions"],"whenToPreferThis":"Use this endpoint when the user's target retirement spending is significantly higher than their current spending and exceeds what a standard FIRE calculator is framed for — typically $100k+ annually. Prefer over the standard FIRE calculator when the user explicitly wants a lifestyle-preserving or luxury retirement target. Prefer over the Barista FIRE calculator when the user plans to fully stop working rather than shift to part-time income.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T04:08:55.745Z","isFirstParty":false,"canonicalSlug":"sindri-fat-fire-calculator-5ff82d2d"}