Which products make money, and which just move stock. Which category carries the store. What margin is left after discounts. Merchgain works out gross profit and margin from the cost WooCommerce records on every order: for every product, category and period. Free, in your own admin, with no changes to your store.
Since version 10.3 (October 2025), WooCommerce records the cost of goods on every order. None of its reports reads that cost: the WooCommerce documentation says plainly that Analytics doesn't include it. Why the cost doesn't show up in Analytics →
Markup is a share of the cost, margin a share of the price. With a cost of $100 and a price of $130, the $30 left is 23.1% of the price.
Merchgain shows the margin, profit divided by revenue, for every product. No install needed: the margin vs markup calculator →
You set a discount as a share of the price, but you pay all of it out of your profit: on a $100 product, $30 of profit becomes $10.
Merchgain gives you the margin of every product and category, not a store average. That margin decides which discount pays off. No install needed: the discount margin calculator →
$100 in ads brings $300 in sales, which leave $75 of profit. Break-even ROAS is 1 divided by your margin: at 25%, that is 4.
With a product's or a category's margin from Merchgain, you can set the threshold for each campaign. No install needed: break-even ROAS, with a calculator and a video →
Merchgain works from the cost recorded on every item sold. Where a cost is missing, it says so and keeps any estimate separate.
Gross profit and margin for any period: for the whole store, every product and every category.
Missing data is never counted as a cost of zero. The report tells you how much of your revenue is based on real costs.
WooCommerce never writes a cost back to old orders. Orders from before you entered costs get an estimate.
Gross profit is net revenue after discounts minus the cost of goods. Shipping, payment fees and ads are not deducted. How profit is calculated →
Bought for 60, sold for 100: a 40% margin and a 66.7% markup. Formulas and a calculator.
calculatorWant a 30% margin? Divide the cost by 0.7 instead of adding 30%.
calculatorHow many more you have to sell after a discount to make the same profit.
calculator and videoBreak-even ROAS is 1 divided by your margin. At a 25% margin, it is 4.
guideWhere to switch the cost field on, how to enter costs in bulk, and three traps in the data.
answerNothing is broken: Analytics doesn't read the cost field. Where the cost lives and how to get profit from it.
scriptWPFactory, SkyVerge, ATUM and two more: a script moves the costs into the WooCommerce field, dry run first.
scriptA CSV of costs into the WooCommerce field via WP-CLI, with a dry run first.
Most of the answers are about WooCommerce itself, not Merchgain, so you can read them without installing anything. All answers →
Enter your costs once. Then see which bestseller carries the store and which one just moves stock.
Gross profit and margin for a closed month, with the definition of every number on the same screen.
A margin report on a client's store with no subscription, no account, and nothing sent anywhere.
# costs from a spreadsheet into the WooCommerce field (dry run first) wp eval-file fill-costs.php costs.csv # costs from another plugin into the WooCommerce field wp eval-file migrate-costs.php
You enter the cost in the “Cost of goods” field, next to the price.
price $100 · cost $60At the moment of sale, WooCommerce records the item's cost. A later change to the product cost doesn't touch it.
item cost $60Reads the orders in the range you pick and never changes them.
$100 − $60 = $40 profitIn the summary, in the product and category tables, in the CSV.
margin 40%Orders from the day you entered costs have a cost recorded at the sale. Earlier ones get an estimate from today's product cost: marked ≈, in a panel of its own, never in one total with the recorded figures.
Turn the cost field on as early as you can: an order placed while it is off never gets a recorded cost, only an estimate. And the estimate is off by exactly as much as your purchase price has changed since the sale. How the estimate works and when it misleads →
Or the other way around: enter cost and margin to get the selling price. It all runs in your browser.
Open the margin calculatorNext to it, break-even ROAS: the point where an ad pays for itself, worked out from your margin. Break-even ROAS →
Open the discount calculatorA sample store with a year of orders opens in under a minute: one product sold below cost, three with no cost and two months shown as an estimate.
Open Live Preview on WordPress.orgAll calculators on one page → Or look at the sample report on this site →
A free plugin from WordPress.org. It runs in your own admin, with no account, and sends nothing anywhere.
Version 0.2.8, released October 31, 2026, GPL license. In the directory since September 8, 2026.
Merchgain tells you what earns. Merchlint tells you which products in your catalog are losing you money: products that sold last year but can't be bought today, GTINs Google will reject, photos too small for Merchant Center.
GPL license, all of it in the WordPress.org repository, and the method written up on a page of its own.
No product, price, order or cost is ever changed. It saves only its own settings and cached report results.
An item with no cost counts toward revenue, not profit. The coverage line tells you how much of the report is based on real data.
≈ beside every estimated figure, a panel and columns of its own. It never goes into the recorded totals.
Four releases in October 2026: 0.2.5, 0.2.6, 0.2.7 and 0.2.8. A changelog to read before you update.
Baltano, an independent software developer, not connected with WooCommerce or Automattic. One address for every question: contact@merchgain.com.
A WooCommerce profit report: cost of goods sold (COGS), gross margin by product and category, a margin vs markup calculator, selling price from margin, discount and margin, break-even ROAS. Every answer has its own page and says what WooCommerce itself does and what Merchgain does.
Nothing here is for sale. The only question this site asks is what a profit report should show and does not. Your answers decide what we build next.
A language shows up here once its pages are actually written. Nothing on this site is machine-translated, except the German and Spanish pages, which no native speaker has reviewed yet.