Ad Budget Calculator
Plan your advertising budget across channels like Google Ads, Meta, and LinkedIn. Allocate spend based on CPA targets, conversion rates, and ROAS goals.
Last updated: March 2026
An ad budget optimiser calculates how to split your advertising spend across channels for maximum return. Start with 50 to 60% on your best performing channel and 10 to 20% on testing new ones. Use this free tool to allocate your budget based on cost per lead data.
Total Leads Generated
123 leads
Blended Cost Per Lead
$82
Google Leads
63
LinkedIn Leads
20
How You Compare
Your blended cost per lead is in the bottom 56% of B2B digital advertising.
Industry typical: $50-200
Source: WordStream Advertising Benchmarks 2025
💡 What This Means
- 📊 $82 blended cost per lead is within the B2B average of $50-$200. Compare channel performance to shift budget toward the best CPL.
- 📈 Google is generating 63 leads vs LinkedIn's 20. Consider shifting more budget to Google if lead quality is comparable.
- 💡 Total of 123 leads/month across all channels. Track lead-to-customer rates by channel — the cheapest leads aren't always the best quality.
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What is Advertising Budget Allocation?
Advertising budget allocation determines how to distribute your total ad spend across channels (Google Ads, LinkedIn, Facebook, etc.) to maximise leads and revenue. The optimal split depends on your industry, target audience, and each channel's cost per lead. Track returns with the Marketing ROI Calculator and monitor lead costs with the Cost per Lead Calculator.
The Formula
Budget per Channel = Total Monthly Ad Budget × Channel Allocation % Estimated Leads per Channel = Channel Budget ÷ Channel CPL
Worked Example
£5,000/month ad budget split across three channels: 50% Google Ads (CPL £35), 30% LinkedIn (CPL £85), 20% Facebook (CPL £22).
- Google Ads: £2,500 ÷ £35 = 71 leads
- LinkedIn: £1,500 ÷ £85 = 18 leads
- Facebook: £1,000 ÷ £22 = 45 leads
- Total leads = 71 + 18 + 45 = 134
- Blended CPL = £5,000 ÷ 134 = £37.31
📌 The £5,000 budget generates 134 leads at a blended CPL of £37.31. LinkedIn delivers fewer leads but higher quality (B2B decision-makers), justifying the higher CPL.
Why This Matters
Channel efficiency
Not all channels perform equally. Shifting 10% of budget from a high-CPL channel to a low-CPL one can increase total leads by 15-25% without spending more. Review allocation monthly based on actual performance.
Lead quality vs quantity
Facebook may deliver £22 leads but if only 2% convert to customers vs 8% from LinkedIn, the effective cost per customer is £1,100 (Facebook) vs £1,063 (LinkedIn). Always measure cost per customer, not just cost per lead.
Common Mistakes
❌ Allocating budget equally across channels
Splitting evenly feels fair but ignores performance differences. Allocate based on each channel's cost per customer (not just CPL), then test reallocating 20% from the worst performer to the best and measure the impact.
❌ Not accounting for attribution lag
LinkedIn and content marketing leads often take 30-90 days to convert. Measuring ROI after 7 days undervalues these channels and over-allocates to instant-gratification channels like Google Ads.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Marketing spend as % of revenue | 5-10% (established) | 10-20% | Above 25% without clear ROI |
| Blended CPL | Below £30 | £30-60 | Above £80 |
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