Most founders switch on Google Ads in their first month because every launch checklist says to. Three months later, the dashboard shows sales, the bank account shows less than it did, and nobody can say whether the ads worked.
Google Ads is a sensible first channel for a new store, since paid search reaches people who are already searching for what you sell. Whether it pays off depends on a handful of numbers you can work out before spending a cent. I’ve audited more than 1,300 online stores and noticed patterns you can avoid with this checklist.
This is the five-question readiness test I run on any new store, with a pass mark for each. To keep the math concrete, I’ll take one hypothetical startup selling dog harnesses through all five questions.
1. Do You Know What One Order Actually Earns?
The dog harness store’s average order value is $75. But only part of that $75 is yours to spend on ads. Most of it already belongs to your supplier, your courier, and your payment processor.
The part left over is your contribution margin: what remains from one order after every cost directly associated with it. Rent, software, and your own salary stay out because they don’t change when you sell one more harness.
For the harness store, it looks like this:
- $75 average order value
- Minus $22 for the harness, including freight to get it to you
- Minus $8 for shipping and packaging to the customer
- Minus $2.25 in payment processing fees, about 3%
- Minus $2.75 set aside for returns and exchanges
- $40 contribution margin per order
That $40 is the most the store can pay to win one sale and still break even on that order’s variable costs. Pay $41, and the sale loses a dollar, however good the ad report looks. Skip this number, and a young business can end up with revenue up and the bank account empty.
Leave repeat orders out of it for now. Established stores rightly count the value of customers who come back, but a store that’s six weeks old has no reliable evidence of who returns. The first order has to carry its own cost.
You pass this question when your contribution margin comes from your own supplier invoices and shipping costs.
2. Does Your Store Already Sell to Strangers?
If the people who find you through Instagram or organic search leave without buying, paid visitors may do the same, except you’re paying for each click.
Your conversion rate is the share of visits that end in an order, and Shopify shows it on the Analytics dashboard. Ignore launch week, when friends and family may have done most of the buying, and wait for at least 500 visits before putting much weight on the figure.
Under 1% is a signal to wait. It often points to problems with the product page, pricing, or shipping charges that appear at checkout. Each of those is cheaper to fix before you pay for traffic.
The harness store has had 1,600 visits since launch week and 40 orders, giving it a 2.5% conversion rate, which passes comfortably.
3. Can a Sale Afford What Google Charges?
Now set those two numbers against the market price, which costs nothing to estimate.
Google’s Keyword Planner shows estimated bid ranges for appearing near the top of search results. Enter the searches your customers would type, such as “no pull dog harness,” and use a representative click-cost estimate from the range.
Divide that click price by your conversion rate to estimate what one sale will cost.
Clicks at 85 cents with a 2.5% conversion rate mean 40 clicks per sale, so each sale costs about $34.
The harness store earns $40 per order and pays roughly $34 to win one. It passes with $6 to spare, which is thin.
Had Keyword Planner shown $1.40 clicks, each sale would cost $56, and every order from an ad would lose $16, assuming the same conversion rate.
Google Ads reports results as ROAS, or return on ad spend, which is sales revenue divided by ad spend.
Your break-even ROAS is your average order value divided by your contribution margin. For the harness store, that’s $75 divided by $40, or about 1.9.
A campaign returning less than $1.90 in revenue for each $1 spent on ads loses money at the contribution level, even while Google reports nearly double the money back.
4. Will Google Know When a Sale Happens?
Automated bidding can only learn from sales it can see.
Conversion tracking records each purchase and its value against the ad interaction that led to it. Without it, Google is guessing, and so are you.
Shopify’s Google & YouTube app can help set up purchase tracking for stores.
Before launch, check that Google Ads lists the purchase conversion as active and records the actual order value rather than a flat $1.
Once ads are running, compare a month of purchases in Google Ads with your store’s orders. If Google reports more purchases than your store actually received, investigate whether conversions are being counted more than once or whether reporting settings differ.
5. Can You Pay for 90 Days of Learning?
Treat the first campaign as a paid experiment. It needs enough sales to tell you something and enough money behind it that nobody panics in week two.
As a practical benchmark, I don’t judge a campaign or give Google a profit target until it has produced about 30 sales. Below that, one lucky week can make a poor campaign look good.
Work backward from 30.
At a 2.5% conversion rate, the harness store needs 1,200 clicks to get there. At 85 cents per click, that’s $1,020, or about $340 a month for three months.
The money also has to be expendable.
If losing $1,020 would mean a missed inventory order or a short payroll, wait, however well the store scored elsewhere.
Scoring the Test
Pass all five questions, and your store is ready to test Google Ads.
Failing question 4 or 5 means you need to delay your launch. Tracking can often be set up in a few days, while the budget is money you’ll need to set aside. Fix whichever one you failed, then launch.
Failing question 1, 2, or 3 means you should wait.
Each points to a problem with the store’s numbers, whether that’s a thin margin, a site that doesn’t convert, or clicks that cost more than a sale earns. Advertising would only make you pay for that problem faster.
Work on your pricing, product page, or average order value, then take the test again.
Your First 90 Days With Google Ads
Days 1 to 30
Your first month needs a straightforward Google Ads campaign setup for beginners.
Start with one Search campaign built around your best-selling product. Use exact match keywords for the product names people search for.
Switch off the Display Network and Search Partners so your clicks come from Google Search itself.
Set bidding to maximize conversion value with no target, use the daily budget from question 5, and avoid making unnecessary changes during the first two weeks.
Days 31 to 60
Each week, open the search terms report, which lists the actual searches that triggered your ads.
Anything irrelevant becomes a negative keyword, so the harness store stops paying for searches like “how to make a dog harness.”
Pause any keyword that has spent twice your break-even cost per sale, $80 for the harness store, without producing an order.
Days 61 to 90
You should be approaching 30 sales by now, assuming your initial estimates hold.
Divide sales revenue attributed to ads by ad spend to calculate your actual ROAS, then compare it with the break-even figure from question 3.
Check it against your store’s own numbers as well.
Total sales divided by total ad spend across every channel, a figure marketers call MER (marketing efficiency ratio), provides a broader view of marketing performance without relying solely on Google’s attribution.
A ROAS comfortably above break-even means you can consider growing.
Add a target ROAS a little above break-even to help guide Google’s bidding toward more profitable sales.
Google asks for this as a percentage, so the harness store’s approximate break-even ROAS of 1.9 becomes 190%. A target around 220% would leave some room for profit if performance holds.
Then raise the budget gradually, about 20% at a time, while monitoring results.
If the result hovers around break-even, hold the budget and work on the store instead. A stronger product page or a bundle that lifts average order value may improve the math faster than a bid change.
Stop spending if ROAS is still under break-even after 30 sales.
It means the campaign isn’t meeting your profitability assumptions. Revisit your calculations using the click prices and conversion rates you actually achieved, and identify what needs to change before spending another dollar.
Image by DC Studio on Magnific
