Unit Economics Simulator
Model your store's full unit economics: contribution margin per order, monthly P&L, break-even orders, and what a 0.5% fee change is really worth — shareable by URL.
Blended: total ad spend ÷ total orders.
Refunded orders; costs revenue but not product for simplicity.
Software, salaries, rent, subscriptions.
Per-order margin waterfall
| Payment fee −0.5% | +$240.00 |
| COGS −5% of AOV | +$2,400.00 |
| CAC −10% | +$1,080.00 |
| AOV +$5 (same costs) | +$2,793.00 |
Your inputs are encoded in the URL — nothing is stored on a server.
Deep-dive any lever: payment fees, CAC & LTV, ad breakeven, or fixed-cost break-even.
Reading your results
A worked example: a store with an $80 average order value, 35% COGS, $7 shipping, standard card fees, $18 blended CAC, and a 4% returns rate keeps about $21 of every order — a 26% contribution margin. At 600 orders and $9,000 of fixed costs a month, that is roughly $3,700 of profit, with break-even at 425 orders. Every number in that chain is a lever, and the sensitivity table prices each one on your inputs rather than generic advice.
Two patterns show up in almost every model. First, per-order costs dominate: a store "doing $50k a month" can be unprofitable purely on contribution margin, and no volume growth fixes that — which is why the break-even order count matters more than revenue. Second, the cheap levers are usually fees and COGS, because they carry no demand risk: cutting CAC requires better marketing, raising AOV requires customers to say yes to something, but a lower processing rate or a renegotiated unit cost drops straight to profit on every single order. Dig into the ad-side levers with the breakeven ROAS calculator and CAC & LTV calculator, and pressure-test your pricing with the break-even calculator.
Frequently asked questions
What are unit economics?
The profit math of a single unit of business — for ecommerce, one order: revenue minus COGS, shipping, payment fees, acquisition cost, and returns. If the contribution per order is positive and covers fixed costs at your volume, the business works; no amount of scale fixes negative unit economics.
What is contribution margin?
What is left of an order after all variable costs — the amount each order "contributes" toward fixed costs and profit. Monthly profit = contribution per order × orders − fixed costs, which also gives your break-even order count.
How do I share my model?
Click "Copy shareable link" — every input is encoded in the URL, so anyone opening the link sees your exact model. Nothing is stored on a server; the URL is the save file.
Which lever should I pull first?
The sensitivity table shows what each is worth on your numbers, but the pattern is consistent: payment fees and COGS improvements are pure margin with no demand risk, AOV increases are next (upsells, bundles), and CAC cuts are the hardest to sustain. Small percentages on every order compound into real money.