Portfolio Cash Burn Calculator

Cash burn sets the runway clock. This calculator reveals when cash goes negative.

Monthly NOI

Monthly debt service

Monthly capex

Cash on hand

NOI stress haircut %

Cash runway

83 yr 3 mo

Stressed monthly burn

Stressed NOI

$289,000

How the math works

Stressed burn = (debt service + capex) − stressed NOI. Runway = cash ÷ burn. 999 = no burn (surplus).

Count only operating cash, not capital account balances from investors — those aren't callable on 30 days. In a liquidity crunch, what you can actually draw is what matters, not what appears on the investor-facing balance sheet.

How to Use

Enter portfolio monthly NOI.
Enter monthly debt service.
Enter monthly capex.
Enter cash on hand.
Enter stress scenario NOI haircut %.
Read cash runway in months.

Frequently Asked Questions

What is burn rate?

Monthly operating shortfall = operating cash needs − operating cash in. Positive burn = eating into cash reserves. Negative burn (surplus) = cash accumulating. Measure stressed, not just base case.

Typical reserves?

Conservative: 6-12 months of stressed burn. Aggressive: 3-6 months. Below 3 months = one missed month triggers covenant violation. Above 12 = overcapitalized (capital drag on returns).

When to act?

Runway below 9 months: prepare refinance materials. Below 6 months: launch refi or capital call. Below 3 months: negotiate forbearance or bring in rescue capital. Don't wait to cross zero — capital partners pay for urgency.