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Savings rate & runway

Surplus % and months of cash coverage

Savings rate & runway

Two numbers that reduce anxiety fast: what percent of income becomes surplus, and how many months your cash reserves cover essential spending.

Savings rate

29.2%

Surplus $3,500 / month

Cash runway

4.7 months

Reserves ÷ monthly expenses

Rough FI number

$2,500,000

At 4% withdrawal

Annual surplus: $42,000

Gap to FI number: $2,000,000

Years to close gap at current surplus (no market growth): 47.6

Stewardship note

Include tithing inside expenses if it is non-negotiable — then savings rate measures surplus after fidelity, not instead of it. Aim for enough runway to sleep (often 3–12 months) without hoarding cash that belongs in the long-term plan.

Rough planning math only. The full FI path calculator adds college, mortgage, vehicles, and returns.

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What to do with the number, before another tool or another calculator.

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