Free Retail KPI, Inventory & Supply Chain Calculators

Gross Margin Calculator

The cleanest read on how much of every sales dollar you actually keep after paying for the goods. Gross margin drives every downstream financial decision in retail: what to price, what to promote, what to keep on the shelf. This calculator returns the margin percent plus the markup equivalent, cost-as-percent-of-revenue, and the price-to-cost multiplier so operators can translate between the three lenses in one view.

Markup Calculator

Set a selling price from cost or reverse-engineer the markup baked into an existing price. Markup is the buyer’s language of pricing (percent added on top of cost), while [margin](/calculators/retail-finance/gross-margin-calculator) is the finance language (percent kept from revenue). This calculator returns markup percent alongside profit per unit, the margin equivalent, and the price-to-cost multiplier so pricing decisions get made in the right language across both teams.

GMROI Calculator

The single most honest cross-category profitability metric in retail. GMROI answers one question: for every dollar of inventory you funded, how many dollars of gross profit did you get back? A high [gross margin](/calculators/retail-finance/gross-margin-calculator) on inventory that never sells produces zero return, which is why GMROI keeps [margin](/calculators/retail-finance/gross-margin-calculator) and [inventory turnover](/calculators/inventory-management/inventory-turnover-calculator) honest against each other. This calculator returns the GMROI ratio alongside gross margin percent, inventory turnover, gross profit and a plain-English performance band so buyers and category managers can read the number in context.

Sell-Through Rate Calculator

The speed-of-sale metric every buyer, planner and category manager reads before touching pricing or reorder decisions. Sell-through rate measures the percent of received units that actually sold across the measurement window. High sell-through means the buy is working. Low sell-through means the inventory is aging faster than expected and the [markdown clock](/calculators/retail-finance/markdown-calculator) is running. This calculator returns the STR percent alongside remaining units, weekly sell rate, projected weeks to 80 percent and 100 percent sell-through, and a plain-English performance band so operators can act on the number instead of just report it.

ROI Calculator

Calculate return on investment for any retail project, marketing campaign, or capital purchase.

Inventory Turnover Calculator

Measure how many times a year your average inventory sells through and gets replaced. The single most consequential operational KPI in retail. It connects buying decisions, warehouse cash, markdown risk, and finance targets into one number. This calculator returns the turn ratio, converts it into days and weeks of supply, and shows how much working capital a one-turn improvement releases.

Reorder Point Calculator

Set the trigger level that fires the next PO for an SKU. Reorder point combines expected demand during lead time with a buffer for the weeks that run hot. Get either half wrong and you either stock out or bury cash on the shelf. This calculator returns the ROP, the lead-time demand, the buffer as a percent of expected demand, and the days of supply the ROP represents at current sales velocity.

Safety Stock Calculator

Size the buffer that keeps shelves stocked when demand spikes or the truck runs late. Enter a target service level, your demand history, and lead time to get the exact number of units to hold above expected demand. No more guessing with "two extra weeks of supply."

EOQ Calculator

Find the order size that minimizes what you spend keeping an SKU stocked. Small orders push order cost up. Big orders push carrying cost up. EOQ finds the point where the two curves cross so you stop paying more than you have to, and it anchors every reorder point and safety stock decision downstream.

Days Inventory Outstanding Calculator

Convert your inventory position into a number finance actually reads: the average days of cash sitting on the warehouse floor. DIO is the same measurement as [inventory turnover](/calculators/inventory-management/inventory-turnover-calculator) in days instead of a ratio, and it maps directly onto working capital, cash conversion cycle and reorder cadence. This calculator returns DIO, weeks of supply, implied turnover, and the exact cash a 10-day DIO improvement would release.

ABC Analysis Calculator

Paste a list of SKUs and their revenue and get an instant A / B / C classification. Use the output to set service levels, safety stock, and buying priority the way experienced planners do.

Markdown Calculator

The pricing tool every buyer and merchandiser reaches for when inventory is running behind sell-through pace. This calculator returns the markdown amount, markdown percent, final selling price, and (when cost is entered) the resulting gross profit and margin percent. It also flags whether the markdown depth is promotional, seasonal, aggressive or clearance-tier, and generates practical next-step recommendations tied to [gross margin](/calculators/retail-finance/gross-margin-calculator), [GMROI](/calculators/retail-finance/gmroi-calculator), [sell-through rate](/calculators/retail-finance/sell-through-rate-calculator) and [inventory turnover](/calculators/inventory-management/inventory-turnover-calculator).