Cash Flow Gap Calculator

Spot a cash crunch before it happens.

How it is calculated

You enter total cash inflows and total cash outflows for the same period. The tool calculates net position = inflows − outflows, gap = max(0, outflows − inflows) and coverage = inflows ÷ outflows × 100. A gap appears only when more cash leaves than arrives; if inflows are higher, the gap shows $0.00 and the net position is positive (with inflows of 60,000 and outflows of 56,500 the net position is $3,500.00 and coverage 106.19%). Coverage below 100% means inflows do not pay for outflows. If outflows are zero, coverage is shown as a dash because the ratio is undefined. Amounts are in US dollars, and a negative inflow or outflow gives no result. Use actual cash movements, not invoiced or accrued amounts.

Worked example

A small firm expects $48,000 of cash receipts next month and $56,500 of payments to suppliers, wages and rent. Step 1: net position = 48,000 − 56,500 = −$8,500.00. Step 2: outflows exceed inflows, so the gap is 56,500 − 48,000 = 8,500. Step 3: coverage = 48,000 ÷ 56,500 × 100 = 84.96%. The tool shows a cash flow gap of $8,500.00, to be bridged with reserves, a credit line or later payments.

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Common mistakes

  • Using sales invoiced in the period as inflows when customers have not paid yet. Only cash actually received counts.
  • Leaving out irregular outflows such as taxes, loan repayments or insurance premiums that fall due in the same period.
  • Mixing periods, for example monthly inflows against a quarterly outflow total, which produces a gap that is not real.
  • Reading a $0.00 gap as comfortable: coverage just above 100% leaves almost no buffer for late payments.
  • Entering outflows as negative numbers. Both fields expect positive amounts, and a negative value returns no result.

About this calculator

The cash flow gap is the shortfall that appears when cash going out of a business during a period exceeds cash coming in — it commonly arises from timing mismatches, such as paying suppliers on 30-day terms while customers take 60 days to pay their invoices, even when the business is profitable on paper.

Spotting the gap ahead of time lets a business arrange short-term financing or adjust payment terms before it actually runs short of cash. This calculator subtracts total cash outflows from total cash inflows over the period you specify to show the size of the gap.

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