🐢Slow FIRE Calculator
Design a gradual path to FIRE with custom full-time, part-time, and sabbatical phases. See exactly when a quality-of-life focused journey reaches financial independence.
Your Numbers
Phase 1 — Full-time
Phase 2 — Part-time
Phase 3 — Sabbatical (zero contribution)
Phase 4 — Full-time again (optional)
Your Results
What Is Slow FIRE?
Slow FIRE is the deliberately paced version of financial independence, built around the idea that the journey matters as much as the destination. Instead of maximizing savings rate and optimizing every dollar toward the fastest possible exit from work, Slow FIRE trades some of that speed for a higher quality of life during the accumulation years. This might mean taking a sabbatical year to travel, shifting to part-time work for a period when a child is young, or reducing hours to pursue something meaningful, all while the portfolio continues growing, just more slowly.
The insight behind Slow FIRE is that retirement is not the only version of a good life, and the race to reach it at maximum velocity can make the years before it worse than necessary. A person who takes one sabbatical year, works three years part-time, and reaches FIRE two years later than they otherwise would has traded two years of retirement age freedom for five years of significantly improved quality of life during their 30s and 40s. Depending on how those years compare, this may be the better trade.
Slow FIRE requires honest modeling because the math of varied contribution rates is less intuitive than a constant savings rate. This calculator lets you build a custom sequence of work phases: full-time years with high contributions, part-time years with reduced contributions, and sabbatical or zero-contribution years. The projection shows exactly when the portfolio reaches your FIRE target given the specific path you choose, so the tradeoff is visible rather than assumed.
How This Calculator Works
Slow FIRE lets you build a custom career path with varying contribution levels and see when financial independence arrives.
Personal Considerations
Present bias, the tendency to weight immediate experience more heavily than future outcomes, is both the reason Slow FIRE is attractive and the reason it is hard to plan honestly. Sabbatical years and part-time phases feel good now; the extended timeline to FIRE feels abstract. The danger is letting present bias run unchecked: taking too many low-contribution years without tracking the cumulative cost. Running the Slow FIRE projection before making each decision makes the tradeoff concrete rather than theoretical. 'Taking one more year at part-time contribution level costs me approximately 1.5 years of FIRE date' is a decision; 'I'm going to take things slower for a while' is drift.
The arrival fallacy is worth naming specifically in Slow FIRE planning. People who design a Slow FIRE path often expect that the reduced pressure and improved daily life will produce a sustained sense of well-being and purpose. This is usually true at first. But the hedonic adaptation that the arrival fallacy describes applies to improved circumstances as readily as it applies to FIRE itself: a 4-day work week quickly becomes the new normal, and the satisfaction fades faster than expected. This is not an argument against Slow FIRE; it is an argument for designing the slow phases around activities that are intrinsically engaging rather than just less stressful, so the value comes from what you do with the time, not just from having more of it.
If what you're feeling goes beyond what a calculator can help with, licensed clinicians are available at SanaNetwork.com, a referral network founded by this site's founder, Dr. Yoendry Torres.
Frequently Asked Questions
This varies enormously by income and spending level. A common approach is to set the part-time contribution at the level you could sustain if your income dropped by 30% to 50%, covering expenses with part-time income and investing the remainder. If full-time work allows $30,000 per year in contributions, a part-time contribution might be $8,000 to $15,000.
The calculator uses a nominal return assumption. For simplicity, you can set the return rate to your expected real return (nominal minus inflation) and use today's dollars throughout. Alternatively, adjust your future FIRE target for inflation manually.
Build multiple sabbatical phases into the plan. The calculator supports any sequence of phases, so you can model full-time, sabbatical, part-time, full-time, sabbatical, and see exactly how that path reaches your FIRE number. Each phase simply adds years of a specific contribution level.
This is a personal question, not a math question. The calculator shows you the cost in years. Whether those years of reduced financial stress and improved daily life are worth the delay depends entirely on what you value and what the working years in between look and feel like. Some people run the numbers and decide the two-year extension is obviously worth a 5-year part-time phase. Others decide the faster exit is more valuable. The calculator makes the tradeoff visible; the choice is yours.