At 35, you have 30 years of compounding left before a traditional retirement at 65 — still a huge runway. With $50,000/yr of retirement spending, a 7% return, 2.5% inflation, and a 4% withdrawal rate, your Coast FIRE number is about $345,000. That's the balance where retirement saving becomes optional.
Want contributions, a coast-date chart, and adjustable rates? Use the full Coast FIRE calculator.
Assumes retirement at 65, 7% nominal returns, 2.5% inflation, 4% safe withdrawal rate. All figures in today's dollars.
| Retirement spending | Full FIRE number | Coast number at 35 |
|---|---|---|
| $40,000/yr | $1,000,000 | $276,000 |
| $50,000/yr | $1,250,000 | $345,000 |
| $60,000/yr | $1,500,000 | $413,000 |
| $80,000/yr | $2,000,000 | $551,000 |
Each dollar invested at 35 becomes roughly $3.63 in today's purchasing power by 65. Mid-thirties is when many households hit peak dual-income years while daycare, mortgages, and career pressure peak too. Coast FIRE is a powerful release valve: reaching ~$345k means you could take the lower-stress job, go part-time, or start a business — without touching your retirement security.
I'm behind — is 35 too late? No. From $150k, saving $2,500/month typically reaches a $345k coast number in about 5–6 years. Run your exact path in the full calculator.
How does a working spouse change this? Coast math applies per household. One partner coasting while the other works is a common hybrid — model household totals, not individual accounts.
What if returns disappoint? A single number can't capture uncertainty. The Monte Carlo planner runs 250 market scenarios against your plan, including crash stress-tests.