Marketing & Agency

How much should a Shopify store spend on Meta and Google Ads?

There's no honest universal number here. Anyone giving you one is guessing. What you can actually build is a number specific to your store, starting from margin and average order value rather than a industry rule of thumb.

Start from what you can afford to pay for a customer

Your average order value and gross margin set a ceiling on what you can spend to acquire a customer and still be profitable on that order. If your margin per order is $30, an allowable CPA above that (before accounting for repeat purchases) isn't sustainable on a single-order basis, even if it looks fine on a ROAS report.

Work backwards from a revenue goal

Say a store wants an extra $20,000 in monthly revenue from paid ads. With a $60 AOV, that's roughly 333 orders. If current conversion rate from ad traffic runs around 2%, that's about 16,650 sessions needed. If a reasonable CPC for that traffic sits around $1.20, that points to a budget in the region of $20,000 to reach the required traffic volume, a very different number than what a generic percentage-of-revenue rule would suggest, and one that's actually derived from this store's own funnel. This is illustrative: your own conversion rate and CPC will move the real number meaningfully.

Enough volume for the algorithm to actually learn

Both Meta and Google's automated bidding need a meaningful number of conversions flowing through each week to optimize reliably. A budget spread too thin across too many campaigns can leave each one individually under that threshold, which shows up as inconsistent, noisy performance that never quite settles, not because the offer is wrong, but because the system never got enough signal to learn from.

A second scenario, same goal, different budget

Take the same $20,000 revenue goal on a store with a $150 AOV instead of $60. That's about 133 orders needed rather than 333, fewer sessions required at the same conversion rate, which can mean a meaningfully smaller budget reaches the same revenue goal. AOV and margin change the required spend more than most people expect, which is exactly why a flat industry number doesn't transfer well between stores.

A calculator would help here

The inputs above (AOV, margin, target CPA, current conversion rate, and a revenue goal) are exactly the kind of thing a simple calculator can turn into a specific number instead of a manual spreadsheet exercise. That's a natural next step we haven't built yet, but the reasoning here is the same logic it would run on.

Common questions

Is there a minimum budget below which ads don't work at all?

There's no fixed number, but there's a real mechanic behind the question: automated bidding on both Meta and Google needs a certain volume of conversions per week to optimize reliably. Below that, campaigns can stay stuck in a longer, less efficient learning phase. The budget needed to reach that volume depends entirely on your CPA, which depends on your numbers, not a generic rule.

Should I set budget as a percentage of revenue?

It's a reasonable planning shortcut once you're established, but it's backwards as a starting point: it tells you nothing about whether that spend can actually generate profitable orders at your margin and target CPA. Build the number from unit economics first, then sanity-check it against a percentage of revenue.

What if my allowable CPA is lower than what the market is actually charging?

That's a real signal worth listening to: it can mean your margin or AOV can't currently support acquiring customers profitably through paid ads at competitive costs, which is a pricing or product economics question before it's a media-buying question.

Want help working out the number?

Send us an inquiry and we can build a realistic budget from your actual AOV, margin and goals.

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