For holders

The gauge, exactly

The formulas behind days funded, fee coverage and the sunset clock.

#Daily cost

Each line's amount spread over its period, added up:

daily cost = Σ  line amount × 86 400 s ÷ period length
             (day = 1 day, week = 7 days, month = 30 days)

Amounts are in lamports and divided as whole numbers, so a line of 0.1 SOL a month costs 3,333,333 lamports a day.

#Days funded

days funded = (vault balance − 0.001 SOL) ÷ daily cost      (whole days)

The 0.001 SOL is kept back so the vault account stays rent-exempt. The gauge's needle reaches F at 60 days and stays there above it; the number below the needle still shows the exact days. A budget with no lines has no daily cost, so its gauge shows a dash.

#Fee coverage

fee coverage = (SOL received by the vault in the last 7 days ÷ 7) ÷ daily cost

Shown as a percentage:

#The sunset clock

idle since = the latest of: the listing time, the last payment to any budget line
sunset due = idle since + idle days

A payment counts from the vault's receipts, which are read from chain, and from the keeper's own record of what it paid.

#What the numbers do not say

The gauge measures money, not work. A line paid every month says the payee was paid, not what they delivered. Read the creator's notes, check the payees, and look at the product itself.