A private FIRE calculator suite that runs in the browser
Hi HN, I built Firenum because most FIRE calculators I found were either too simplistic or required uploading my entire financial life to a third-party server. I wanted a comprehensive suite that could model more than just the 4% rule. This tool handles Coast, Lean, Fat, and Barista FIRE, but more importantly, it lets you model 'what-if' scenarios like market crashes or major life events to see how they impact your timeline. Key features: -> Privacy-First: No signup required. All calculations and data persistence happen in your local storage. Nothing is sent to a backend. -> Scenario…
What it does
In the maker’s words, at launch
Hi HN, I built Firenum because most FIRE calculators I found were either too simplistic or required uploading my entire financial life to a third-party server. I wanted a comprehensive suite that could model more than just the 4% rule. This tool handles Coast, Lean, Fat, and Barista FIRE, but more importantly, it lets you model 'what-if' scenarios like market crashes or major life events to see how they impact your timeline. Key features: -> Privacy-First: No signup required. All calculations and data persistence happen in your local storage. Nothing is sent to a backend. -> Scenario Modeling: You can simulate market downturns to see the resilience of your plan. -> Multi-Currency: Supports 8 major currencies. -> Progress Tracking: A dashboard to visualize the 'boring middle' of the journey. The goal was to make something as powerful as a complex spreadsheet but with a much better UX. I’d love to hear your thoughts on the projection logic and if there are any specific variables (like tax drag or inflation adjustments) you think are missing. URL: https://firenum.com/ I’m happy to answer any questions about the math or the local-first implementation!
Does the same job
all alternatives →- AFA FIRE calculator that verifies or determines your retirement numberFeb 2026 · retirenumber.com · ▲5
Most retirement calculators either oversimplify things or ask you to link your accounts so they can make money off your data. I wanted something that actually helped me see if I was on track without handing over a bank login, so I built RetireNumber. It's a privacy-first retirement planner. You type in your own numbers. No account linking, no selling your data, no VC. Just me and a subscription. The engine does real math: Monte Carlo with 1,000 runs, historical backtesting to 1928 using Shiller's Yale data, tax-aware withdrawal strategies, and scenario comparison so you can try different…
- MAMyFire.app – A Financial Freedom, Fire Calculator2024 · myfire.app · ▲6
The calculator quickly shows you how long your nest egg will last, given a constant withdrawal. It automatically shows you a safe withdrawal rule to have your capital last forever.
FireDate – FIRE CalculatorAug 2026 · smartpixelstudio24.gumroad.com · ▲3Know the exact year you can stop working
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