Definition
Change in working capital is the period-over-period movement in operating working capital (typically AR, inventory, AP). It explains cash shifts that do not show in profit.
Formula
Change in working capital = current period NWC - prior period NWC
Example
If NWC rises from $200k to $320k, change in working capital is +$120k, which uses cash.
How to use it
- Rising receivables or inventory usually consumes cash even if revenue is growing.
- Improving payables terms can release cash without changing revenue.
Common mistakes
- Treating higher NWC as always good; it can signal collections issues.
- Mixing operating items with cash or short-term debt in the calculation.
Why this matters
This term matters because cash timing and risk are usually the difference between a plan that works on paper and a plan that survives. Use consistent definitions so decisions are comparable over time.
Practical checklist
- Write a 1-line definition for "Change in Working Capital" that your team will use consistently.
- Keep the time window consistent (weekly/monthly/quarterly) when comparing trends.
- Segment results (channel/plan/cohort) before drawing big conclusions from blended averages.
- Sanity-check with a related calculator from the same category on MetricKit.
- Read the related guide (e.g., Cash conversion cycle: turn working capital into runway) for context and common pitfalls.
Where to use this on MetricKit
Calculators
- Profitability Index Calculator: Calculate profitability index (PI) from discounted cash flows and estimate the max investment for a target PI.
- WACC Calculator: Calculate WACC (Weighted Average Cost of Capital) from capital structure, cost of equity, cost of debt, and tax rate.
- Equity Value Calculator: Convert enterprise value (EV) into equity value using cash, debt, and other adjustments (optionally per share).
- Pre-money vs Post-money Valuation Calculator: Convert between pre-money and post-money valuation and estimate investor ownership from a financing round size.
- Pro Rata Investment Calculator: Estimate how much you need to invest in a new round to maintain your ownership percentage (simplified).
Guides
- Cash conversion cycle: turn working capital into runway: A practical guide to the cash conversion cycle (CCC): how AR/AP timing changes cash, how to reduce days outstanding, and why runway depends on working capital.
- 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.