GMROI Calculator

Calculate Gross Margin Return on Investment to measure inventory profitability.
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How to Use

Step-by-step instructions
  1. 1Enter total sales revenue
  2. 2Input Cost of Goods Sold (COGS)
  3. 3Enter average inventory value at cost
  4. 4Result shows the return on inventory investment percentage

GMROI Formula

Measures how many dollars of gross profit are earned for every dollar invested in inventory.
GMROI = (Gross Profit ÷ Average Inventory Cost) × 100

Variables:

Gross ProfitSales - Cost of Goods Sold
Avg Inventory(Beginning + Ending Inventory) ÷ 2

Example

Retail Store

Inputs:

Sales:$100,000
COGS:$60,000
Avg Inventory:$20,000

Steps:

  1. 1.Gross Profit = $100,000 - $60,000 = $40,000
  2. 2.GMROI = ($40,000 ÷ $20,000) × 100 = 200%
Result:
200% Return ($2 profit for every $1 inventory)

Frequently Asked Questions

What is a good GMROI?

Typically, a GMROI of 200% or higher is considered good in retail. It means you are earning $2 gross profit for every $1 invested in inventory.

How can I improve GMROI?

Increase prices (margin), reduce COGS (negotiate), or increase inventory turnover (sell faster/hold less stock).

Why not just use Profit Margin?

Profit margin ignores how much capital is tied up in stock. GMROI accounts for inventory efficiency.