If you’re running ads on both Google and Facebook, the most common question is: how much should go to each? The answer depends on your business type, sales cycle, and goals — but there’s a practical framework you can apply in about five minutes. According to a WordStream analysis of 10,000+ small business accounts, the average SMB that uses both platforms allocates 60% to Google and 40% to Facebook, and the most profitable accounts adjust that ratio based on their specific business model.
The Baseline: 60/40 Rule of Thumb
For most small businesses, a 60/40 split (Google/Facebook) is a solid starting point. Google captures high-intent search traffic — people actively looking for what you sell. Facebook creates demand through discovery and retargeting. The 60/40 split reflects the fact that Google traffic typically converts at higher rates (people are searching with intent), while Facebook provides scale and retargeting efficiency.
When to lean toward 70/30 Google-heavy: Service-based businesses (plumbers, lawyers, dentists), long sales cycles (B2B consulting), and businesses where customers search first and buy later. Google captures people who are ready to buy right now.
When to lean toward 50/50 or even 40/60 Facebook-heavy: Ecommerce businesses with visual products, businesses with strong brand awareness, younger demographics (under 35), and low-consideration purchases ($20-100 range). Facebook excels at showing people products they didn’t know they wanted.
The Three-Factor Adjustment Model
Beyond the baseline, adjust your budget split based on three factors specific to your business:
1. Average Order Value: Higher AOV businesses benefit more from Google Ads (searchers with high intent are willing to make larger purchases). Lower AOV products benefit from Facebook’s impulse-buy dynamic. If your average order is over $200, lean Google. Under $50, lean Facebook.
2. Sales Cycle Length: Short sales cycles (1-7 days from click to purchase) work well on both platforms. Longer cycles (2 weeks+) benefit from Facebook’s retargeting capabilities. If your customers take a month to decide, put more budget on Facebook so you can serve retargeting ads throughout their consideration period.
3. Business Stage: New businesses with no brand recognition should start with Google (people need to search for what you offer). Established businesses with existing customer lists should invest more in Facebook (lookalike audiences from customer data perform exceptionally well).
How to Test and Optimize Your Split
Don’t set your budget split once and forget it. Run a 30-day test: start at 60/40 and track cost per lead and ROAS for each platform. At the end of 30 days, shift 10% of budget from the lower-performing platform to the higher-performing one. Repeat until you find the sweet spot. According to a McKinsey analysis, companies that regularly rebalance their channel mix see 15-25% higher marketing ROI than those that maintain static allocations. A Bayesian MMM tool like OptiMix automates this optimization by analyzing your full channel performance data and recommending the precise budget allocation that maximizes total conversions at your target cost.
Common Mistakes in Budget Allocation
Mistake 1: Putting all budget on one platform. If Google Ads stops working (algorithm change, policy update, increased competition), you have zero fallback. A minimum of two platforms provides redundancy and lets you compare performance.
Mistake 2: Using the same split all year. Ad costs vary seasonally. Facebook CPMs typically rise 20-30% in Q4 (holiday competition). Google CPCs often drop in January (less competition). Adjust your split quarterly based on performance trends.
Mistake 3: Not accounting for attribution lag. Facebook conversions often take 1-7 days after click. Google conversions are usually same-day. If you evaluate both platforms on same-day data only, you’ll systematically undervalue Facebook. Use a 7-day click or 1-day view attribution window for Facebook to get a fair comparison.
Frequently Asked Questions
How to split ad budget between Google and Facebook for a service business?
Start at 70/30 (Google/Facebook). Service businesses benefit from high-intent search traffic on Google. Use Facebook primarily for retargeting and brand awareness.
How to split ad budget between Google and Facebook for ecommerce?
Start at 50/50. Ecommerce businesses benefit from Facebook’s visual discovery and Google’s search intent. Adjust based on which platform delivers better ROAS for your specific products.
Should I use both Google and Facebook if I have a small budget?
If your total monthly ad budget is under $1,000, focus on one platform. Pick whichever historically works best for your industry, or test $500 on each for 30 days to find your winner.
What to Do This Week
Take one practical step with the Meta campaign you are most tempted to scale or cut. Pull the last 30 to 90 days of spend, revenue, qualified leads, and any notes about promotions or sales changes. Then write one sentence that explains what you believe is happening. For example: “This channel is creating new demand,” “this campaign is capturing demand we already had,” or “this spend is not showing up in qualified outcomes.”
Next, choose a small test that could prove or disprove that sentence. That might mean trimming budget by 10%, changing the offer, separating branded from non-branded traffic, improving the landing page, or comparing platform-reported conversions with CRM results. Keep the test narrow enough that you can learn from it.
The cleaner the feedback loop between Meta, your landing page, and your sales outcomes, the easier it becomes to tell whether the campaign deserves more budget or a sharper fix.
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