This document defines several common sales formulas used in retail business including formulas to calculate average inventory, cost of goods sold, gross margin, break-even analysis, contribution margin, markup, reductions, and more. It provides the equations for calculating key metrics like gross margin return on investment, inventory turnover, maintained markup percentage, net sales, open to buy, percentage increase or decrease, sales per square foot, and stock to sales ratio.
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Sales formulas
1. Sales Formulas
Average Inventory
Average Inventory (Month) = (Beginning of Month Inventory + End of Month Inventory) ÷ 2
Basic Retailing Formula
Cost of Goods + Markup = Retail Price
Retail Price - Cost of Goods = Markup
Retail Price - Markup = Cost of Goods
Break-Even Analysis
Break-Even ($) = Fixed Costs ÷ Gross Margin Percentage
Contribution Margin
Contribution Margin = Total Sales - Variable Costs
Cost of Goods Sold
COGS = Beginning Inventory + Purchases - Ending Inventory
Gross Margin
Gross Margin = Total Sales - Cost of Goods
Gross Margin Return on Investment
GMROI = Gross Margin $ ÷ Average Inventory Cost
Initial Markup
Initial Markup % = (Expenses + Reductions + Profit) ÷ (Net Sales + Reductions)
Inventory Turnover (Stock Turn)
Turnover = Net Sales ÷ Average Retail Stock
Maintained Markup
MM $ = (Original Retail - Reductions) - Cost of Goods Sold
MM % = Maintained Markup $ ÷ Net Sales Amount
Margin %
Margin % = (Retail Price - Cost) ÷ Retail Price
Markup
Markup $ = Retail Price - Cost
Markup % = Markup Amount ÷ Retail Price
2. Net Sales
Net Sales = Gross Sales - Returns and Allowances
Open to Buy
OTB (retail) = Planned Sales + Planned Markdowns + Planned End of Month Inventory - Planned Beginning
of Month Inventory
Percentage Increase/Decrease
% Increase/Decrease = Difference Between Two Figures ÷ Previous Figure
Reductions
Reductions = Markdowns + Employee Discounts + Customer Discounts + Stock Shortages
Sales per Square Foot
Sales per Square Foot = Total Net Sales ÷ Square Feet of Selling Space
Stock to Sales Ratio
Stock-to-Sales = Beginning of Month Stock ÷ Sales