How the lot margin is calculated
You buy a whole lot at one unit cost, then split it into Grade A, B and C units that each resell at a different price. The calculator blends those grades into a single lot outcome and reports both the per-unit and the whole-lot result.
Step by step, it does this:
- Units per grade = lot size times each grade share. So 100 units at 50 / 30 / 20 percent gives 50 Grade A, 30 Grade B and 20 Grade C.
- Revenue = the sum of units per grade times that grade resale price.
- Costs = unit cost times lot size, plus total shipping, plus selling fees charged as a percentage of revenue.
- Gross profit = revenue minus costs. Margin = profit divided by revenue. Markup = profit divided by cost.
- Breakeven = the average resale price per unit at which profit is exactly zero.
Worked example
Buy 100 units at 100 each. Split 50 percent Grade A resold at 180, 30 percent Grade B at 150, 20 percent Grade C at 110. Selling fees 3 percent, shipping 500 for the lot.
Revenue is (50 x 180) + (30 x 150) + (20 x 110) = 9,000 + 4,500 + 2,200 = 15,700. Costs are (100 x 100) + 500 shipping + 3 percent of 15,700 in fees (471) = 10,971. Gross profit is 15,700 minus 10,971 = 4,729, which is 47.29 per unit, a 30.1 percent margin and a 43.1 percent markup. Breakeven average resale price is (10,000 + 500) divided by 0.97, then divided by 100 units, which is 108.25 per unit. Sell the blended lot above that and it profits.
Frequently asked questions
What if my grade shares do not add up to 100 percent?
The calculator warns you but still computes using the exact shares you entered. If they sum to more or less than 100 percent, your unit counts will be off, so fix the shares for an accurate lot figure.
Should shipping be the buy-in freight or the resale postage?
Use whichever costs you carry on the lot. If landed import costs are the bigger question, run the landed cost calculator first to get your true per-unit buy cost, then bring that number back here as the unit cost.
Does it handle a single grade?
Yes. Put 100 percent on Grade A and leave B and C at zero, and it behaves like a simple buy-price to sell-price margin calculator.
Is my data private?
Yes. It is pure browser math. Nothing you type is uploaded, logged or stored, and the page works offline once loaded.
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