Retail is a margin-and-turnover game, not a revenue game. A busy store can still bleed cash if inventory sits or markdowns pile up. Model the ratios before you commit to a lease and a buy.
The retail cost and productivity stack
| Metric | Healthy range |
|---|---|
| Gross margin | 40-55% (COGS 45-60% of sales) |
| Labor % of sales | 10-20% (lean specialty 12-18%) |
| Rent / occupancy | 6-12% (warn above 12%) |
| Sales per sqft | ~$325 avg; apparel $250-$600; grocery/convenience $330-$500 |
| Inventory turnover | 4-12x/yr (apparel 8-12x, grocery 14-20x, furniture 4-6x) |
| Sell-through (full price) | 70-85%; below 60% signals buying errors |
| GMROI | 2.0-4.0x; below 1.5x means inventory isn't earning its keep |
| Conversion | 20-35% of store visitors |
Startup budget
A boutique or small retail store typically costs $30K-$150K to open (build-out, first inventory, equipment, licenses, signage), per SBA 2025 ranges. Build-out white-box runs about $20-$75/SF. Add a 3-6 month operating reserve.
Traps that sink retail openings
- Dead stock. Buying too much of the wrong SKU ties up cash and forces margin-killing markdowns. Track sell-through by style-color-size, not just by brand.
- Wrong location math. Rent must fit the sales/sqft your concept can clear. A lease that needs $600/sqft when you can plausibly do $300/sqft is unwinnable.
- Ignoring shrink. Retail shrink runs about 1-2% of sales (NRF). It comes straight out of gross margin.
GMROI is the quiet hero: a category with 50% margin but 2x turnover (GMROI 1.0) earns the same per inventory dollar as a 25%-margin category turning 4x. Expand the one with the higher GMROI, not the higher margin.
Sources (retrieved 2026-08-13): National Retail Federation (NRF) shrink and returns research; CasesCoach retail financial-metric benchmarks; FinancialModelsLab and FinancialModelTemplates specialty-retail KPI planning ranges; SBA 2025 retail startup-cost ranges; published sales-per-sqft retail data.