Definition
Cash flow volatility measures how much cash inflows and outflows swing over time, affecting liquidity risk.
Formula
Volatility = standard deviation of cash flow over time
Example
If monthly net cash flow varies between -$300k and +$200k, volatility is high.
How to use it
- Volatility increases the value of a larger cash buffer.
- Use rolling windows to observe trend changes.
Common mistakes
- Ignoring seasonality when interpreting volatility.
- Using revenue volatility as a proxy for cash volatility.
Measured as
Volatility = standard deviation of cash flow over time
Misused when
- Ignoring seasonality when interpreting volatility.
- Using revenue volatility as a proxy for cash volatility.
Operator takeaway
- Volatility increases the value of a larger cash buffer.
- Use rolling windows to observe trend changes.
- Tie Cash Flow Volatility to the same balance-sheet date, scenario, and decision memo you are using elsewhere in the model.
- Document which claims, costs, or adjustments your team includes before comparing numbers across forecasts, covenants, or valuation work.
Next decision
- Read Cash runway: how to estimate burn, break-even, and survival time if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
- Decide whether Cash Flow Volatility belongs in cash planning, valuation, or debt monitoring so the number is used in the right model.
Where to use this on MetricKit
Guides
- Cash runway: how to estimate burn, break-even, and survival time: A practical guide to runway: net burn, gross profit, break-even revenue, and how to avoid common cash planning mistakes.
- Runway and burn: gross vs net burn, working capital, and cash levers: A practical guide to runway: compute net burn, understand why cash differs from profit, and how working capital and collections change runway.