# Liquidity Ratios
Liquidity ratios measure a firm's ability to meet short-term financial obligations (current liabilities). They look at how readily current assets can be converted to cash.
## 1. Current Ratio
$$\text{Current Ratio} = \frac{\text{Current Assets}}{\text{Current Liabilities}}$$
- A standard benchmark: 2 : 1.
- Includes inventories and prepaid expenses in CA.
## 2. Quick / Acid Test Ratio
$$\text{Quick Ratio} = \frac{\text{Quick Assets}}{\text{Current Liabilities}}$$
Where Quick Assets = Current Assets − Inventories − Prepaid Expenses.
- Benchmark: 1 : 1. Removes the least-liquid items (stock and prepaids).
## 3. Absolute Cash Ratio (Absolute Liquidity Ratio)
$$\text{Cash Ratio} = \frac{\text{Cash} + \text{Marketable Securities}}{\text{Current Liabilities}}$$
Most stringent test. Cash + Marketable Securities includes:
- Cash in Hand
- Cash at Bank (Dr balance)
- Marketable Investments / Short-term securities (current investments)
## 4. Basic Defence Interval (Days)
$$\text{BDI} = \frac{\text{Quick Assets}}{\text{Cash Expenses per Day}} \quad \text{(in days)}$$
Where:
- Cash Expenses per Day = Annual Cash Expenses / 365
- Cash Operating Expenses = COGS + Selling/Admin/Other Expenses (excluding depreciation & non-cash items)
- Cash Expenses = Total Expenses − Depreciation − Write-offs
Significance: How many days the firm can keep meeting cash operating expenses purely out of its quick assets — i.e., how long it can defend itself in a no-cash-inflow scenario.
## How They Differ
| Ratio | Includes Stock? | Includes Prepaids? | Includes Receivables? |
|---|---|---|---|
| Current | ✓ | ✓ | ✓ |
| Quick | ✗ | ✗ | ✓ |
| Absolute Cash | ✗ | ✗ | ✗ |
Each ratio peels back a layer of liquidity to test progressively stricter solvency.