Coast FIRE Calculator
Coast FIRE is the amount you need invested today so that — with no further contributions — it grows to your full FIRE number by retirement.
Your details
Coast FIRE number
$275,551.41
- Full FIRE number
- $1,000,000.00
- Surplus / gap vs now
- -$175,551.41
Coast FIRE number$275,551.41
Formula
Coast number = FIRE number ÷ (1 + real return)^years, where real return = (1 + return) ÷ (1 + inflation) − 1.
Sources & methodology
Uses a real (inflation-adjusted) return; the 4% rule is a guideline, not a guarantee.
- •U.S. SEC — retirement — SEC
Last updated: 2026-07-20
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