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Growth practice
How to grow sales and profit
Choose one bottleneck and test one hypothesis. These themes recur in Shopify, SaleHoo and DSers materials; they are not a popularity ranking or an income promise.
New section · 23 October 2026 · StepToDrop editorial team
Check demand before expanding the catalog
- For eBay, use Product research to compare sold items of the same type, condition and market. For Shopify, list customer searches and questions, then test one product hypothesis.
- Compare 2–3 suppliers by sample, stock, delivery and returns. A high view count alone does not demonstrate profitable demand.
Example. Compare the same bundle and delivered price, not just the headline price.
Checkable result: You have one candidate product, demand evidence and a reason for choosing the supplier.
Set a customer acquisition spending ceiling
- First subtract product cost, shipping, fees and expected returns from revenue. The pre-ad contribution limits acquisition spending, but must also cover fixed costs and your target profit.
- Recalculate each product in the calculator. Separately plan cash to pay suppliers before receiving payouts.
Example. Illustration: $80 − $32 − $8 − $5 − $3 = $32 before ads. With $18 acquisition cost, $14 remains before fixed costs and taxes. $32 is not a recommended ad budget.
Checkable result: You know the contribution per order and your chosen test spending limit.
Remove one obstacle to purchase
- On Shopify, review the mobile product page and checkout: variants, total cost, delivery, returns and payment. On eBay, start with accurate category, item specifics, photos and description.
- Use platform reports to find where buyers drop off. Change one significant element so you can interpret the result.
Example. If visitors add to cart but do not buy, investigate unexpected shipping charges and payment availability.
Checkable result: You recorded a baseline, one change, and the subsequent metric over a comparable period.
Run one bounded acquisition test
- Choose one channel: useful search content, social content or available platform advertising. Define the hypothesis, duration, budget and stop condition in advance.
- Measure paid orders and spending, not clicks alone. With few orders, conclusions remain provisional.
Example. Hypothesis: a video explains product size better than a photo. Measure orders and contribution after costs, not likes.
Checkable result: The test has a spending cap, change log and a decision: continue, adjust or stop.
Test a relevant bundle or add-on
- Offer a combination that solves one customer need. Check both items’ stock, compatibility and combined delivery.
- After a discount, recalculate product cost, shipping, fees and returns. A higher average order value helps only with acceptable economics.
Example. A product plus a compatible refill can be useful; adding an unrelated item solely to raise the order total is a weak hypothesis.
Checkable result: Compare average order value and contribution after variable costs per order.
Reduce losses and create a reason to return
- Review reasons for returns, cancellations and questions. Fix the description or supplier process where the same issue repeats.
- Help with product use and tracking. For marketing messages, respect consent, platform rules and unsubscribe options.
Example. Repeated sizing questions → add a clear size comparison and reassess returns.
Checkable result: You track repeat orders, returns and support requests, not just new revenue.
Which numbers to watch
- Store conversion
- Sessions with a purchase ÷ sessions × 100%. Use the same definition in the platform report.
- Average order value
- Order revenue ÷ order count. Keep discount and refund treatment consistent.
- Acquisition cost
- Selected-channel spending ÷ acquired new customers. With zero customers, the metric is not zero: there is no acquisition result yet.
- Contribution per order
- Revenue minus variable costs, including acquisition. This is not yet net profit.
Search Console shows Google search impressions and clicks. Check orders, conversion and revenue separately in Shopify or eBay; these reports are not interchangeable.
Sources and editorial basis
StepToDrop Editorial Team · Last checked:
Selling price minus product cost is not the same thing as real profit.
In dropshipping, one order can be affected by product cost, supplier shipping, marketplace or payment-provider fees, advertising, refunds, replacements, currency conversion, and other variable costs. A product with a high selling price can therefore have weak unit economics when some of those expenses are left out.
The method below is a practical way to evaluate one order before you scale it.
The basic formula
For a practical order-level estimate, use this logic:
Order economics = revenue − product cost − shipping − fees − advertising − reserve for refunds/replacements − other variable costs.
This is not necessarily the company’s accounting net profit. After estimating one order, the business can still have subscriptions, fixed expenses, taxes, accounting costs, and other obligations.
Costs to include
1. Product cost
This is the amount you actually pay the supplier for the item.
If the supplier changes prices or uses different prices for warehouses, variants, or order volumes, use the current cost of the exact variant you intend to sell.
2. Supplier shipping
Do not assume that shipping is free.
Check:
- whether shipping is included in the product price;
- whether the price depends on destination country;
- whether faster shipping costs extra;
- whether different warehouses or variants have different shipping costs.
3. Platform and payment fees
Depending on your business model, you can have costs such as:
- marketplace fees;
- payment-processing fees;
- transaction fees;
- other service fees.
Do not use one universal percentage for every platform, account, payment method, and country. Check the current terms that actually apply to your account before launch.
4. Advertising
If the sale was acquired through paid advertising, acquisition cost belongs in the order economics.
Do not look only at total ad spend. What matters for the product decision is also how much you are effectively spending to acquire a paid order.
5. Refunds and replacements
Real operations can involve:
- returns;
- reshipments;
- partial refunds;
- replacements;
- customer compensation;
- lost or damaged parcels.
When evaluating a product, it can be useful to include a reasonable reserve for these outcomes, based on actual data once you have enough orders to estimate it.
6. Currency conversion
If the customer pays in one currency, the supplier charges another, and payouts arrive in a third currency, the result can differ from a simple single-rate calculation.
Include currency-conversion cost only where it actually applies.
7. Apps and other variable costs
Some costs appear only when the store operates or increase with order volume.
Examples can include:
- apps;
- order-processing services;
- paid automation tools;
- additional fulfillment-related services.
You do not have to force every fixed business expense into a single-order calculation. The important point is not to forget costs that genuinely affect the decision to scale.
A simple example
Assume:
- sale price: $80;
- product cost: $32;
- shipping: $8;
- platform/payment fees: $5;
- advertising: $18;
- refund/replacement reserve: $3.
Calculation:
$80 − $32 − $8 − $5 − $18 − $3 = $14
In this example, $14 of contribution remains after the listed variable costs.
That does not mean the company’s accounting net profit is $14. There can still be:
- subscriptions;
- fixed expenses;
- taxes;
- accounting costs;
- other business expenses.
But this calculation is much more useful than simply saying “$80 minus $32.”
Revenue, contribution, and margin are not the same thing
Revenue is the amount the customer paid.
Contribution is the amount left after the variable order costs included in your calculation.
Margin helps show how large the remaining amount is relative to revenue.
A high selling price does not guarantee a strong business. A product can look attractive until advertising, shipping, fees, and returns are included.
Costs that sellers often forget
Before treating a product as profitable, check whether you have considered the items that actually apply to your model:
- product purchase cost;
- shipping;
- marketplace fees;
- payment fees;
- advertising;
- refunds;
- replacements;
- disputes or customer compensation where relevant;
- currency conversion;
- apps and services;
- discounts;
- applicable taxes and duties.
Not every seller has every one of these costs. Include only the costs that are relevant to your real setup.
How the supplier affects profit
A supplier affects economics through more than the product price.
For example:
- expensive shipping reduces margin;
- frequent defects increase replacements;
- unstable stock causes cancellations;
- slow delivery can increase support contacts and compensation;
- a sudden supplier price increase can erase the margin you originally calculated.
That is why the cheapest supplier does not always produce the most profitable product.
Related guide: How to Choose a Dropshipping Supplier
eBay dropshipping economics
For eBay, include the costs that really apply to your account and model, such as:
- product cost;
- supplier shipping;
- marketplace fees;
- additional fulfillment expenses;
- returns and customer compensation.
Do not rely on old or averaged fee percentages without checking the current terms for your account and listing category.
Related:
Shopify dropshipping economics
For Shopify, the calculation can include:
- product cost;
- shipping;
- payment fees;
- advertising;
- apps;
- refunds;
- replacements;
- currency conversion.
The actual cost set depends on the country, payment method, apps, and operating model you use.
Related:
When not to scale a product
Do not increase advertising spend just because one day happened to be profitable.
Recheck the model if:
- customer acquisition cost is rising;
- refunds are consuming the margin;
- shipping problems are creating compensation costs;
- the supplier raises the product price;
- profitable performance is not repeating;
- there is still too little data;
- the result works only under a discount that cannot be maintained.
Scaling makes more sense when the economics repeat across real orders rather than only looking good in the first calculation.
Use the StepToDrop calculator
You do not need to calculate everything manually every time.
StepToDrop already includes an order-economics calculator:
Use the real values for your product. StepToDrop’s analytics should not receive the numeric values entered in the calculator.
Checklist before scaling
Confirm:
- product cost is included;
- shipping is included;
- relevant platform/payment fees are included;
- advertising cost is included;
- refund/replacement risk is considered;
- currency conversion is included when applicable;
- the resulting margin has been calculated;
- the calculation has been checked against real data when available.
Selling in the USA: shipping, product safety and launch preparation
What to do next
If the product economics look healthy, test how resilient the result is to changes in supplier price, advertising cost, shipping cost, and returns.
Related guides: