How to Estimate Cash Runway From a 10-Q, With Worked Math

The short version

Cash runway is an estimate of how long a company can keep operating on the cash it has, at the rate it is currently spending. For a company that loses money, it is the number that most often determines when the next share sale happens, which is why it sits at the centre of dilution research.

The basic formula is simple: liquid cash divided by monthly cash burn. The work is in picking the right inputs from the 10-Q, adjusting for the time that has passed since the quarter ended, and reading the notes for anything that changes the picture. This guide walks through it with one worked example.

Step 1: find the cash

On the balance sheet, add up the liquid resources:

• Cash and cash equivalents. Always included.
• Short-term investments or marketable securities. Usually Treasury bills or money market funds the company can turn into cash quickly. Include them.
• Restricted cash. Exclude it, or note it separately. It is held as collateral or for a specific purpose and cannot pay ordinary bills.

Long-term investments are less liquid and are usually left out of a conservative estimate.

Step 2: find the burn

Use the cash flow statement, not the income statement. Net loss includes non-cash items such as stock-based compensation and depreciation, and it ignores changes in working capital, so it can be far from the actual cash leaving the business.

The measure most people use is net cash used in operating activities, often with capital expenditures added, since buying equipment also consumes cash. One trap: the cash flow statement in a 10-Q is year to date. A third-quarter 10-Q shows nine months, not three. To get one quarter, subtract the six-month figure from the prior 10-Q, or divide the year-to-date total by the number of months it covers.

Step 3: divide, then adjust for time

Runway in months = liquid cash ÷ monthly burn. But that answer is measured from the balance sheet date, the last day of the quarter. A 10-Q is filed weeks later, often 40 to 45 days after quarter end for smaller companies, so some of that runway was already used by the time you read it.

A worked example

Hypothetical Company X files its third-quarter 10-Q on November 14 for the quarter ended September 30.

All figures are hypothetical.

Liquid cash: $12,000,000 + $3,000,000 = $15,000,000. Restricted cash is excluded.

Monthly burn: ($13,500,000 + $450,000) ÷ 9 = $1,550,000 a month.

Runway from September 30: $15,000,000 ÷ $1,550,000 = 9.7 months, which points to roughly mid-July of the following year.

Runway from the filing date: about 1.5 months passed between September 30 and November 14, so roughly 8.2 months remained when the 10-Q was filed.

Step 4: check whether the burn is changing

A nine-month average can hide a trend. Suppose Company X's six-month 10-Q showed operating cash outflow of $8,100,000. Then the third quarter alone used $13,500,000 − $8,100,000 = $5,400,000, or $1,800,000 a month, faster than the nine-month average of $1,500,000 (operating only). Using the latest quarter:

All figures are hypothetical. Capex is spread evenly at $50,000 a month in both rows.

Neither row is "the" answer. They are a range. A clinical trial starting, a product launch or a cost-cutting program can move burn sharply, and the MD&A section of the 10-Q often says which way management expects spending to go.

Step 5: read the notes for what changes the number

Several disclosures can move runway by months:

• Subsequent events. The last note in the financial statements lists events after quarter end. If Company X sold $4,000,000 of stock through its ATM program in October, its cash at filing was higher than the balance sheet shows.
• Debt maturities. A $5,000,000 note due in six months is a cash need the burn rate does not capture.
• Liquidity section of the MD&A. Management states how long it believes current resources will last. That statement is the company's own estimate, and it is worth comparing with yours.
• Going concern language. If management or the auditor concludes there is substantial doubt about the company's ability to continue for one year, the runway estimate and that conclusion should be read together.
• Later 8-Ks. Any financing announced in an 8-K after the 10-Q changes the starting cash.

What runway does not tell you

• How the company will fund itself. It might use an ATM, an equity line, a registered direct, debt, a partnership or asset sales. Each has a different dilution profile.
• Anything for profitable companies. If operating cash flow is positive, runway is not a meaningful measure.
• Off-balance-sheet obligations. Purchase commitments and leases are in the notes and may not show in the burn yet.

How to check a company on Signal8

• The must-raise screener lists companies whose estimated runway is short, based on reported cash and burn. Treat it as a starting list, then check the filings.
• Company pages have a Financials tab, for example AAPL's financials, for the balance sheet and cash flow history.
• The Dilution tab, for example AAPL's Dilution tab, is where Signal8 organises dilution data for covered small-cap issuers, including a cash position estimate where one has been modelled.

FAQ

How do you calculate cash runway?

Add cash, cash equivalents and short-term investments from the latest balance sheet. Take net cash used in operating activities from the cash flow statement, add capital expenditures if you want a fuller picture, and convert it to a monthly figure using the number of months the statement covers. Divide the cash by the monthly burn. Then subtract the time between the balance sheet date and today.

Should I use net loss or operating cash flow for burn?

Operating cash flow is usually better. Net loss includes non-cash expenses like stock-based compensation and depreciation, and leaves out working capital movements, so it can overstate or understate the cash actually spent. Many analysts use operating cash outflow plus capital expenditures as the burn figure.

Why is the cash flow statement in a 10-Q year to date?

SEC rules require the interim cash flow statement to cover the fiscal year to date. A third-quarter 10-Q therefore shows nine months of cash flows. To isolate a single quarter, subtract the previous 10-Q's year-to-date figure.

Does a short runway mean a company will issue shares soon?

Not necessarily. It means the company will need cash from somewhere if spending continues at the measured rate. It might raise equity, borrow, sign a partnership, sell assets or cut costs. Runway describes the need, not the outcome or its timing.