Defensive Interval Ratio (DIR) Calculator
From liquid assets and annual operating expenses, compute the defensive interval (in days) — how long a firm survives with no new revenue.
Input Data
Results
At a glance:DIR = liquid assets / daily operating expense; daily = annual operating expenses / 365 (exclude depreciation/amortisation, non-cash). Liquid assets = cash, equivalents, short-term investments, receivables (exclude inventory, prepaid). Example: 600k liquid, 1.46m annual → daily 4,000, DIR 150 days (~5 months). More days = thicker buffer. WARNING: Zero-revenue stress test; compare with quick/current ratio and cash flow. Education, not advice.
Formula
Daily operating expenses = annual operating expenses / 365.
Defensive interval (days) = liquid assets / daily operating expenses.
$$\text{Daily Operating Expenses} = \dfrac{\text{Annual Operating Expenses}}{365}$$$$\text{Defensive Interval Ratio (days)} = \dfrac{\text{Liquid Assets}}{\text{Daily Operating Expenses}}$$How to Use
- Enter liquid assets (cash, short-term investments, receivables).
- Enter annual cash operating expenses (exclude depreciation).
- View the days the firm can operate with no new revenue.
FAQ
How is DIR different from quick and current ratios?
Quick/current ratios divide assets by liabilities (a multiple, measuring debt coverage). DIR divides liquid assets by daily operating expense, giving days of survival with zero revenue (resilience). Example: a quick ratio of 1.2 says little about endurance, but DIR of 150 days directly shows the buffer against income interruption. Use all three: quick/current for debt structure, DIR for worst-case survival.
Why exclude depreciation and amortisation?
DIR measures how long real cash can fund operations. Depreciation/amortisation are non-cash accounting charges — no actual cash leaves. Including them overstates daily cash burn and understates survival days. Enter cash operating expenses only (wages, rent, utilities, materials, interest).
Is more days always better?
Generally more days = stronger resilience, valuable in recessions or crises. But too long may signal idle cash and poor capital efficiency (lower returns). 'Safe' depends on industry and revenue stability: stable cash flows (utilities) need less; volatile/seasonal firms need more. Read with trend and peers.
What are liquid assets, and what to include?
Liquid (defensive) assets are those quickly convertible to cash: cash & equivalents, short-term investments (marketable securities, money-market funds), and accounts receivable. Exclude inventory (slow to realise) and prepaid expenses (already paid). Watch receivables quality — large bad debts reduce realisable liquid assets below book.
Which companies is DIR most useful for?
Those where cash endurance is existential: (1) pre-profit startups — DIR is their 'runway' before the next raise; (2) seasonal/volatile industries (travel, retail, F&B, trading) — checks off-season survival; (3) firms in crisis/turnaround — assesses short-term buffer; (4) stress testing even stable firms. For stable mature firms (utilities, steady REITs), DIR is less critical; profitability and leverage matter more. Always pair with quick ratio, current ratio and operating cash flow.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.