Ad Budget Guide
How much should you actually spend on ads? The answer is in your margins, not a blog post.
Everyone asks "how much should I spend on Facebook ads?" and every blog gives the same useless answer: "it depends." Thanks. Super helpful.
Here's the truth: your ad budget should be calculated from your unit economics, not pulled from thin air. The right budget for a brand with 70% gross margins and a $80 AOV is completely different from a brand with 40% margins and a $25 AOV. Yet both brands read the same "start with $50/day" advice and wonder why one is profitable and the other isn't.
Below is the math-based framework we use to set ad budgets for every eCommerce client. It starts with your margins, works through your customer acquisition cost targets, and gives you a budget number that's tied to profitability — not guesswork.
15-25%
Typical Marketing Budget (% of Revenue)
$2M+
Ad Spend Managed
150+
Budgets We've Set
3-6x
Target Blended ROAS
How to fix this — step by step
Calculate your maximum customer acquisition cost (CAC)
Maximum CAC = (AOV x gross margin) - desired profit per order. If your AOV is $80 and gross margin is 70%, your gross profit per order is $56. If you want $20 profit per order, your max CAC is $36. That means you can spend up to $36 to acquire one customer and still be profitable on the first purchase. This number is the foundation of your entire budget.
Factor in customer lifetime value
If your average customer buys 2.5 times over their lifetime, your max first-order CAC can be higher because you'll recover the acquisition cost on repeat purchases. LTV-based CAC = (AOV x gross margin x average orders per customer) - total desired profit. This typically allows a 40-60% higher CAC target than first-order-only math. But only use LTV math if you actually have retention data — don't assume repeat purchases you haven't earned yet.
Set your daily budget based on target monthly revenue
Work backward from your revenue goal. If you want $30K/month from paid ads at a 4x ROAS, you need to spend $7,500/month = $250/day. Start at 50% of your target daily budget for the first 30 days (learning phase). Scale to full budget once ROAS is consistent. If you can't afford the budget your math says you need, either improve margins, raise prices, or reduce your revenue goal from ads.
Allocate budget across channels based on stage
New to paid ads: 100% to one platform until profitable (usually Meta or Google Shopping). Scaling: 60% to your best-performing platform, 30% to your second channel, 10% to testing. At $10K+/month: add retargeting (15-20% of total budget), testing budget for new creatives and audiences (10%), and consider TikTok or YouTube. Don't spread thin across 5 platforms — own 1-2 first.
Review and adjust weekly, not monthly
Check ROAS, CPA, and daily spend every 7 days. If a campaign is profitable, increase budget by 20% every 3-4 days. If it's not profitable after 2 weeks, cut the spend and diagnose (creative fatigue? audience saturation? landing page issue?). Weekly reviews prevent you from bleeding money for 30 days on a broken campaign or under-investing in a winning one.
Want us to handle this?
This framework gives you a budget tied to real numbers — your margins, your AOV, your LTV. No guessing. You can calculate your starting budget in 30 minutes.
But managing that budget — optimizing campaigns daily, testing creative, managing bid strategies, and scaling profitably — is where the real work happens. We manage $2M+ in annual ad spend and we know how to turn a budget into revenue. If you want us to build your ad budget model or manage your campaigns, that first call is free.
Questions our best clients asked first
Want a custom ad budget model for your brand?
We'll analyze your margins, AOV, and LTV — then build a budget model tied to your specific profitability targets. Free budget strategy call.
Pick a Time15 minutes. No pitch deck. Just your data and our honest take.
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