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…
A private FIRE calculator suite that runs in the browser launched on February 1, 2026 with 5 votes, #1,882 of 16,627 launches that month and more than 75% of that year's launches.
What it does
Model income, expenses, assets, debts, and life events month by month. 9 currencies. Runs in your browser — no sign-up, no data collection.
Test your retirement plan against every market crash since 1871. Thousands of simulations, 6 stress scenarios, one clear answer. No sign-up required. We backtested 154 years of market data to find out when an advisor is actually worth it. When you want a human in your corner, start with vetted professionals who charge flat or hourly fees, never commissions. The full Fire Planner on your phone — home-screen icon, full-screen, works offline. Same private, no-signup planning. Now a tap away. Your FIRE number is the total amount of money you need invested to cover your living expenses indefinitely without working. It's calculated by multiplying your annual expenses by 25 (based on the 4%…from firenum.com
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…
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A FIRE calculator that verifies or determines your retirement numberFeb 2026 · retirenumber.com · ▲5Most 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…
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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.
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