E-COMMERCE UNIT ECONOMICS CALCULATOR
USER INPUTS
Front-End Product Price฿
Cost of Goods Sold (COGS)฿Group cost, not the PBB transfer price. Robots from the Maytronics PO +20% landed; the rest buy at ≈JD cost already.
Shipping Cost฿฿60 to 24.9kg, ฿150 to 49.9kg, ฿400 over — what the customer is charged. What the carrier bills PBB is unverified.
Estimated AOV (Average Order Value)฿The single revenue base.
Estimated CAC (Customer Acquisition Cost)฿Placeholder — paid has never run here. This is the figure to solve for, not one to trust.
Total Ad Spend฿
Estimated Conversion Rate (%)%Home & Garden median on Meta. A planning basis, not a measured rate — paid has never run here. Vary it to test sensitivity.
Estimated CPC฿Checked against the affordable bid.
Payment Processing Fee%1.65% Omise PromptPay + 1% Shopify. Cards 4.65%.
Payment Fee, Fixed฿
VAT Rate%Prices are quoted VAT-inclusive.
Price BasisN
QR / PromptPay Fee%1.65% Omise + 1% Shopify.
Orders Paid by QR%Measured: every order since 2024 is Omise PromptPay QR, not cards.
Refund / Cancellation Rate%Measured: ฿5,143 refunded of ฿1,154,219 across 135 orders. Goods return; carriage and fee do not.
Orders per Customer per YearNStore-wide repeat is 1.48, but follow-up orders average 29% of the first — the second buy is chemicals, not another robot. So 1 + 0.48 × 0.29.
AUTO-CALCULATED FIELDS
Total Product Cost (COGS + Shipping)฿—
VAT on the Order฿—Remitted, never earned.
Net Revenue (ex-VAT)฿—The margin base.
Payment Processing Fee Per Order฿—
Gross Profit per Unit฿—
Gross Margin %%—Source divided cost by price: 41.01% where the truth was 58.99%.
Break-even CAC฿—Above this, the first order loses money.
Break-even CAC per Customer฿—
Break-even ROASN—
ROAS (Return on Ad Spend)N—Green when it clears break-even.
AOV:CAC RatioN—Target ≥ 2.0.
Net Profit per Order฿—
Estimated OrdersN—Ad spend ÷ CAC × repeat.
Estimated Revenue฿—One figure. The source had two, ฿50,000 apart.
Estimated Profit฿—
Estimated Profit %%—On net revenue. Target ≥ 20%.
Estimated ROASN—
Max Affordable CPC฿—
KPI TARGETS

Only KPI rows are judged. The other eleven are reference quantities — break-even ROAS is the line ROAS is measured against, so colouring it would be circular.

— Recalculates locally. Nothing leaves this browser.