Retail Trade Math Explained
Retail Trade Math Calculator Guided Edition
With Buyer Annotations
The numbers every retail buyer runs before you walk in the room — with plain-English explanations of what each calculation reveals, what a strong result looks like, and what buyers are actually diagnosing when they ask.
WHAT'S INSIDE
· 8 core retail math formulas with worked examples
· Buyer annotation on each: what they're diagnosing with this number
· Acceptable ranges by retailer tier (mass, specialty, club)
· Red flag thresholds — numbers that end the conversation
· Blank calculation worksheet — fill in your own numbers
· Channel Doctrine reference strip
Built from real buyer meetings — not academic formulas.
retail.draymoorventures.com · steven@draymoorventures.com
THE 8 FORMULAS
Work through each formula with your own numbers. The buyer annotation on each tells you what the buyer is actually diagnosing — not just what the math produces.
01 Keystone Margin
The baseline retailer margin test. Keystone (50%) is the minimum most retailers require to support promotions, markdowns, and operational costs without going underwater.
FORMULA Wholesale Price = MSRP ÷ 2
EXAMPLE MSRP $49.99 → Wholesale $24.99
BUYER NOTE
If your wholesale is above 50% of MSRP, the buyer will calculate whether they can afford to promote you. If the math doesn't leave room, the conversation ends quietly.
Mass (Walmart/Target) 48–55%
Specialty (Best Buy) 40–50%
Club (Costco) 30–40% — compensated by volume Wholesale above 60% of MSRP. Buyers cannot run TPRs or
RED FLAG
02 Gross Margin %
absorb markdowns.
Your margin after cost of goods. This is the number that determines whether your business survives retail — after deductions, freight, slotting, and chargebacks are absorbed.
FORMULA Gross Margin % = (Wholesale − COGS) ÷ Wholesale × 100 EXAMPLE Wholesale $24.99, COGS $10.00 → ($24.99 − $10.00) ÷ $24.99 × 100 = 59.9%
BUYER NOTE
Buyers don't always ask for this directly — but they can usually reverse-engineer it from your pricing. If your margin looks thin, they'll wonder if you'll survive a markdown cycle.
Minimum viable 40%+ Healthy 50–65% Strong 65%+
RED FLAG
03 Sell-Through Rate
Below 35%. Retail deductions will eliminate your margin before year one.
The single number buyers use to determine whether you stay on shelf. It measures how much of what they ordered actually moved. Low sell-through triggers markdowns, chargebacks, and delisting.
FORMULA Sell-Through % = Units Sold ÷ Units Received × 100 EXAMPLE 800 units sold ÷ 1,000 units received × 100 = 80% sell-through
BUYER NOTE
This is the first question after your first season. "How did you sell through?" If you don't know your number, you've already lost the reorder conversation.
Minimum to hold placement 65%+
Healthy 75–85%
Strong — triggers reorder conversation 85%+
Below 60%. Expect a markdown request or SKU discontinuation
RED FLAG
within 60 days.
04 Velocity (Turns Per Door Per Week)
The operational heartbeat of your retail performance. Velocity tells buyers whether your item is earning its shelf space week over week.
FORMULA Weekly Velocity = Units Sold ÷ # of Doors ÷ # of Weeks EXAMPLE 4,000 units sold ÷ 200 doors ÷ 8 weeks = 2.5 units/door/week
BUYER NOTE
"What turns do you project per door per week?" is the first real question in most buyer meetings. Not having an answer — or giving an aspirational one — signals inexperience immediately.
Entry threshold 1.0+ units/door/week Solid performance 2–4 units/door/week Strong — reorder trigger 4+ units/door/week
RED FLAG
Below 1.0. At this rate, the item is occupying shelf space without earning it.
05 Retail Margin % (Buyer's Margin)
The margin the retailer earns on your item before their own operating costs. This is the number they're protecting when they push back on price increases or request promotional support.
FORMULA Retail Margin % = (MSRP − Wholesale) ÷ MSRP × 100 EXAMPLE MSRP $49.99, Wholesale $24.99 → ($49.99 − $24.99) ÷ $49.99 × 100 = 50%
BUYER NOTE
Retailers need room to run 15–20% TPRs without going below cost. If your wholesale price doesn't leave that room, you'll be asked to fund it — or replaced.
Minimum 45%
Target 50–55%
Premium category tolerance 40–45% with strong velocity Below 40%. Buyer cannot absorb standard promotional
RED FLAG
06 Landed Cost Per Unit requirements.
Your true cost per unit to get product on shelf and absorb retailer requirements. Most brands underestimate this by 15–25% because they exclude compliance, EDI setup, and estimated chargebacks.
FORMULA Landed Cost = COGS + Freight + Duties + Compliance Costs + Chargebacks (est.)
EXAMPLECOGS $8.00 + Freight $1.20 + Duties $0.80 + Compliance $0.50 + Chargebacks est. $0.75 = $11.25 landed
BUYER NOTE
Buyers don't ask for this directly — but your pricing tells them whether you've done the math. Brands that underprice wholesale are usually the ones who come back asking for price increases in year two.
Rule of thumb Landed cost should be ≤35% of MSRP for healthy margin Mass retail Landed cost ≤25% of MSRP
Specialty Landed cost ≤40% of MSRP
Landed cost above 50% of MSRP. The retail model doesn't work at
RED FLAG
07 Markdown Exposure this ratio.
The dollar amount you're liable for if your product doesn't sell through. Retailers increasingly push markdown liability to vendors — particularly for seasonal, fashion, or trend-driven items.
FORMULAMarkdown Exposure = (1 − Sell-Through %) × Units Placed × Markdown Depth
EXAMPLE 20% unsold × 1,000 units × $10 markdown = $2,000 markdown liability
BUYER NOTE
If you haven't modeled your markdown exposure before the meeting, you're not ready. Buyers will ask for markdown funding if sell-through falls below 70%. Know your number before they name it.
Low risk Below $500/SKU per season
Manageable $500–$2,000
High risk — renegotiate terms Above $2,000/SKU
No markdown policy or reserve. One bad season can produce a
RED FLAG
chargeback that erases your profit.
08 Price Architecture Integrity Check
The three-point test that confirms your price architecture can survive retail. Each ratio exists to protect a different stakeholder: MAP protects retailers from Amazon erosion; MSRP protects MAP; wholesale protects your margin.
FORMULAMAP ≥ Wholesale × 1.5 (minimum) · MSRP ≥ MAP × 1.1 · Wholesale ≤ MSRP × 0.55
EXAMPLE Wholesale $24.99 → MAP minimum $37.49 → MSRP minimum $41.24 If MSRP is set at $49.99 — architecture is intact.
BUYER NOTE
Buyers check your Amazon price before the meeting. If your Amazon price is below MAP — or close to your wholesale — you've already created a channel conflict. They'll ask about it in the first five minutes.
All three ratios satisfied Architecture intact — proceed to pitch One ratio violated Fix before outreach — will surface in meeting Two+ ratios violated Structural pricing problem — not ready Amazon selling price within 15% of wholesale. Retailers cannot
RED FLAG compete and will not place.
YOUR NUMBERS WORKSHEET
Fill in your product's numbers below before your next buyer meeting.
MSRP (Suggested Retail Price) $_________
Wholesale Price $_________
MAP (Minimum Advertised Price) $_________
Cost of Goods (COGS) $_________
Estimated Freight / Unit $_________
Estimated Duties / Unit $_________
Estimated Chargebacks / Unit $_________
Landed Cost (sum above) $_________
Keystone Margin % Wholesale ÷ MSRP × 100 = _____% Your Gross Margin % (Wholesale − COGS) ÷ Wholesale × 100 = _____% Retail Margin % (Buyer's) (MSRP − Wholesale) ÷ MSRP × 100 = _____%
Current Sell-Through % Units Sold ÷ Units Placed × 100 = _____% Weekly Velocity (per door) Units Sold ÷ Doors ÷ Weeks = _____ units/door/wk Markdown Exposure (1 − ST%) × Units × Markdown Depth = $_________
Steven Bickers Channel Strategist · Draymoor Ventures
Director of Global Sales (Americas) at Cleer Audio. Retail channel experience across Walmart, Target, Best Buy, Costco, and Amazon — running programs at scale.
Holly Sweezey Merchandising & Licensing Advisor · Draymoor Ventures
Former retail buyer at TJX, BoxLunch, and Crunchyroll. Assortment planning, licensed IP evaluation, and buyer-readiness reviews. She evaluates brands the way retailers actually do.
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