GMROI Calculator — Gross Margin Return on Inventory
Calculate GMROI — how many dollars of gross profit you earn per dollar of inventory investment.
Benchmark your retail or wholesale inventory efficiency.
Gross Margin Return on Inventory (GMROI)
GMROI tells you how many dollars of gross profit you generate for every dollar invested in inventory. It combines margin and inventory turnover into a single number, making it one of the most important KPIs for any retail or wholesale business.
Formula:
GMROI = Gross Profit / Average Inventory Cost
Equivalently:
GMROI = Gross Margin % × Inventory Turnover
Where:
- Gross Profit = Revenue - Cost of Goods Sold (COGS)
- Average Inventory Cost = (Beginning Inventory + Ending Inventory) / 2
- Inventory Turnover = COGS / Average Inventory
What a good GMROI looks like:
| GMROI | Meaning |
|---|---|
| Below 1.0 | Losing money on inventory — selling below cost or stock sitting unsold |
| 1.0 – 2.0 | Marginal — covering inventory cost but thin profit |
| 2.0 – 3.5 | Typical for most retail categories |
| 3.5+ | Strong — inventory is very productive |
Industry benchmarks:
- Grocery: 4–7x (low margins, very fast turnover)
- Apparel: 1.5–3.0x (moderate margins, slower turnover)
- Jewelry: 1.0–2.5x (high margins, very slow turnover)
- Electronics: 2.5–4.0x (low margins, moderate turnover)
GMROI reveals the margin-turnover trade-off:
A luxury store with 60% margins but inventory that turns over once a year may have a GMROI of 0.60 — terrible. A grocery chain with 25% margins but 8x annual turnover has a GMROI of 2.0 — much better.
How to improve GMROI:
- Reduce dead stock and clearance markdowns
- Negotiate better COGS with suppliers
- Improve forecasting to reduce overbuying
- Focus on faster-turning, higher-margin categories