Ad budget calculator
Work backwards from your revenue target to calculate the ad budget you'll need. Enter your average order value, conversion rate, and cost per click to see exactly what it takes to hit your number.
Use our conversion rate calculator if you are unsure
How to set an ad budget that actually makes sense
Most businesses set their ad budget backwards - picking a number that "feels right" and hoping for results. The smarter approach is working backwards from your revenue target, using real data on conversion rates and CPCs to calculate exactly what you need to spend.
The formula is: Ad Budget = (Revenue Target / AOV) / (Conversion Rate / 100) x Average CPC. This gives you a data-driven budget tied to a specific outcome - not a guess.
The four variables that determine your budget
- Revenue target: The clearer this is, the more actionable your budget. Set monthly targets, not vague annual goals.
- Average order value: Higher AOV means fewer conversions needed. Upselling and bundling directly reduce the budget required to hit your target.
- Conversion rate: The most powerful lever. Doubling your conversion rate halves your required budget. Invest in CRO before scaling spend.
- Cost per click: Varies dramatically by platform, industry, and competition. Google Search is typically $1-$5 for most industries, but competitive verticals can reach $20-$50+.
Budget allocation across channels
The most accurate planning approach is to budget by channel, not as a single blended number. Search, paid social, shopping, retargeting, and email all behave differently. Start with the economics of each channel, then roll them up into the total budget you need.
When to increase vs. decrease your budget
Increase budget when conversion rate is stable, CPC is under control, and incremental spend still produces acceptable efficiency. Decrease or reallocate budget when efficiency drops below the margin threshold, tracking breaks, or the landing page cannot handle the extra traffic.
Frequently asked questions
How do I calculate my ad budget?
Work backwards from your revenue goal. Divide your target revenue by your average order value to get the number of conversions needed. Divide that by your conversion rate to get the clicks required. Multiply by your average CPC - that's your estimated ad budget.
What percentage of revenue should I spend on ads?
It depends on your growth stage and margins. Established brands often spend 5-10% of revenue on marketing. Growth-stage companies may invest 15-30%+. The right number is whatever produces a profitable ROI given your margins and LTV.
How do I find my average CPC?
Check your Google Ads or Meta Ads account for historical CPC data. If you're starting fresh, use Google Keyword Planner for estimated search CPCs or research industry averages. CPCs vary dramatically by industry - from $0.50 for display to $50+ for competitive B2B keywords.
What if my budget is too high for my revenue target?
You have four levers: increase your conversion rate (the most impactful), increase average order value, find channels with lower CPCs, or adjust your revenue target. Often a combination of all four produces the most realistic budget.
Should I include all channels in one budget?
Calculate budgets per channel since CPCs and conversion rates vary significantly across Google Search, Google Display, Meta, LinkedIn, etc. Then combine them for your total marketing budget. This also helps you identify which channels offer the best efficiency.
How often should I review my ad budget?
Monthly at minimum, weekly during high-spend periods. As real data comes in, your actual CPC and conversion rate will differ from estimates. Adjust your budget based on real performance data, not just projections.
Does this calculator account for the full marketing funnel?
This gives you a direct-response estimate - the budget needed to drive conversions at a given CPC and conversion rate. It doesn't account for brand awareness spend, retargeting layers, or multi-touch attribution. For complex funnels, plan a portion of budget (typically 10-20%) for upper-funnel and retargeting campaigns.
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