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Everything you need to know about calculating real ecommerce profit — from VAT and payment fees to ROAS and breakeven points.
Why accurate profit calculation matters for ecommerce
Most ecommerce sellers underestimate their true costs. Payment processing fees, VAT, shipping, and platform charges all eat into your margin before you see a penny. ProfitGenie strips all of that away to show you your real profit on every sale.
VAT collected is not your income — it belongs to the tax authority. Always remove it before calculating margin.
Shopify Payments charges 2.9% + $0.30 per transaction. On a $20 sale, that's over 4% of your revenue gone before costs.
A healthy ecommerce profit margin is typically 15–30%. Below 10%, small cost changes can quickly turn profitable products into loss-makers.
How to price products correctly for ecommerce
Guessing at a selling price is one of the most common mistakes new ecommerce sellers make. Too low and you're working for nothing; too high and you lose sales. The Price Finder calculator works backwards from your target margin to give you the exact price to charge.
Your selling price must cover product cost, shipping, payment fees, VAT, and still leave your target margin — in that order.
Etsy charges a 6.5% transaction fee plus listing fees. Factor these in as your payment fee percentage to get an accurate price.
For POD stores, include the base product cost from your supplier as your product cost and let ProfitGenie calculate the minimum viable price.
How shipping costs quietly reduce ecommerce profit
Shipping is one of the biggest hidden profit killers in ecommerce. Free shipping offers, undercharging, and fluctuating carrier rates can turn a profitable product into a loss with no obvious warning. The Shipping Impact calculator shows exactly how much each order's shipping costs you in real margin terms.
Offering free shipping typically increases conversion rates but transfers the entire shipping cost directly to your margin.
If you charge $4.99 shipping but your carrier charges $6.50, you're absorbing $1.51 per order — invisible unless you track it.
For high-volume sellers, even a $0.50 shipping shortfall per order adds up to thousands in lost profit annually.
How discounts affect ecommerce margins and profit
Running a sale feels good — until you see the numbers. Discounts reduce revenue immediately but leave all your costs unchanged. A 20% discount on a product with a 25% margin can eliminate profit entirely. The Discount Impact calculator shows exactly what a promotion will cost you and how many extra sales you'd need to break even.
A 10% discount on a 20% margin product reduces that margin by 50% — not 10%.
The "extra sales needed" figure shows how many more units you must sell post-discount to earn the same profit as before.
Seasonal discounting on Etsy and Shopify can drive volume, but only if your margin can absorb the reduction.
How to calculate breakeven sales for your online store
Knowing your breakeven point is essential for any ecommerce business. It tells you the minimum number of sales required each month to cover all your costs before making any profit. The Breakeven Calculator splits your costs into per-sale variable costs and fixed monthly overheads, giving you a clear and accurate target.
Fixed monthly costs — like platform subscriptions, tools, and software — must be covered before you earn a single penny of profit.
The lower your profit per sale, the more sales you need to break even. Improving your margin reduces your breakeven point dramatically.
For Shopify and Etsy sellers, monthly plan fees, transaction fees, and advertising costs are all fixed overheads that belong in your breakeven calculation.
What is ROAS and how do ecommerce sellers use it?
ROAS (Return on Ad Spend) measures how much revenue you earn for every pound or dollar spent on advertising. While ROAS is widely used, it only tells part of the story — a high ROAS does not guarantee profit if your product costs, fees, and VAT are not accounted for first.
Break-even ROAS is the minimum ROAS you need before your ads stop losing money. Anything below this and your ad spend exceeds your available profit.
Target ROAS goes further — it is the ROAS needed to hit your desired profit per sale after advertising costs are deducted.
VAT and payment fees are deducted before profit is calculated, so the revenue available to cover ad spend is always less than the selling price.