Savings · General formulas

Savings Runway Calculator

Estimate when accessible savings reach a reserve floor or depletion using monthly income, spending and explicit inflation assumptions. Use the example values or enter your own numbers to explore an estimate.

Currency formatting only—not an exchange-rate conversion. No country-specific tax or government rules are applied.

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USD · example
Additional assumptions in use
  • Maximum projection horizon: 10 years

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The PDF includes active input values and option labels, results, sources, model assumptions, and the schedule when available. Schedule periods follow the model: years, months, or actual payments.

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    Share assumptions, never dollar amounts

    Links include eligible rate, term or frequency assumptions only. Dollar amounts are never included. Recipients must enter their own amounts; the link will not reproduce your full financial scenario.

    HOW IT WORKS

    Calculation method

    Receive fixed nominal income at the start of each month, then deduct expenses at month-end. Expenses increase monthly by the equivalent of the chosen effective annual inflation rate. Record first reserve-floor and zero-balance months.

    KEEP IN MIND

    Assumptions & limits

    • Example: 12,000 savings, 2,000 spending, 1,000 income and 0% inflation reaches a 2,000 reserve at month 10 and depletion at month 12.
    • No return on savings, taxes or automatic spending cuts. Reserve and income stay nominally fixed. Unfunded expenses are not shown as negative investment assets.
    • Basis: User-entered values.
    • Basis: Standard fixed-payment and time-value-of-money formulas.

    Source/rule review year: Not applicable — general mathematical model.

    Savings Runway Calculator | WealthMathPro