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Cost Avoidance Calculator

Enter the old cost, new cost and number of periods to get the cost avoidance.

How it is calculated

The tool uses per period = old cost − new cost and total = per period × number of periods. The old cost is what you would have paid had the action not been taken, such as a quoted price after an increase; the new cost is what you actually pay. Both are plain amounts per period, shown in dollars, and neither may be negative. The periods field is optional: left empty it counts as 1, so the total equals the per-period figure. Periods can be a fraction (2.5 gives 2.5 times the per-period amount), 0 gives a total of $0.00, and a negative number gives no result. If the new cost is higher than the old one, the results are negative, written with the sign in front, such as -$250.00. Later periods are not discounted and no inflation is added.

Worked example

A supplier would have charged 1,200 per month after a price increase, but a renewal negotiated at 950 per month avoids that. Per period: 1,200 − 950 = $250.00. Over a 12-month contract the total avoidance is 250 × 12 = $3,000.00. If you left the periods field empty, the total would show only one month, $250.00. Swapping the two costs would give -$250.00 per period, meaning no cost was avoided.

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Common mistakes

  • Using last year's price as the old cost when no increase was ever proposed. Cost avoidance needs a credible higher figure, such as a quote, a published rate or a confirmed increase.
  • Mixing periods, for example a monthly old cost and an annual new cost. Both costs and the number of periods must refer to the same period length.
  • Leaving the periods field blank on a multi-month contract. The total then covers a single period only.
  • Reporting the result as cash saved. Avoidance means a cost that was prevented, so it does not lower your actual spending against last period's budget.
  • Ignoring the time value of money on long contracts. The total is a simple multiplication and does not discount later periods.

About this calculator

This calculator quantifies cost avoidance — savings from preventing a future cost increase from ever happening, as opposed to cost reduction, which cuts a cost you're already paying. Given an old cost, a new (avoided) cost, and a number of periods, it reports both the per-period saving and the cumulative avoidance over time.

Procurement and finance teams track cost avoidance separately from realized savings on financial statements — locking in a supplier rate before a price hike, or negotiating a renewal below the market's new going rate, are classic examples that never show up as a cash outflow reduction but still represent real value delivered.

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