Runway calculator
How many years of runway do your reserves give you?
Enter your reserve balance, what you add each year, and the big projects ahead. Everything runs in your browser, and nothing is sent anywhere. The example values show how it works.
Your reserves
Major projects
Enter today's cost. Set "Repeats" for costs that come back, such as paint. Leave it at 0 for one-time projects.
Advanced assumptions
Your estimate
of runway
An educational estimate from the numbers you entered. It is not a reserve study or financial advice.
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Year-by-year table 30 rows
| Year | Starting balance | Added | Interest | Spent | Ending balance |
|---|
How it's worked out: each project's future cost is today's cost grown by inflation for the years until it's due. Interest is earned on the starting balance plus half of that year's net additions. The ending balance is the start, plus what was added and earned, minus what was spent.