Agency Fee Calculator
Calculate agency fees based on retainer, percentage of spend, or performance models. Compare pricing structures to find the best fit for your budget.
Last updated: March 2026
An agency fee calculator helps you understand and compare agency pricing models including retainer, project based, and performance based fees. Monthly retainers for B2B marketing agencies typically range from $3,000 to $25,000. Use this free tool to evaluate agency proposals.
Cost Per Lead
$150
Agency ROI
233.3%
Retainer as % of Total
33.3%
Total Monthly Cost
$15,000
How You Compare
Your cost per lead is better than 50% of B2B marketing agencies.
Industry typical: $50-300
Source: HubSpot Marketing Benchmarks 2025
💡 What This Means
- ✅ 233% ROI means your agency is profitable. Monitor this monthly to catch any downward trends early.
- 💰 Cost per lead of $150. Compare this to what you'd achieve running ads in-house — factor in the cost of your team's time.
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What is Agency Fee ROI?
Agency fee ROI measures the return generated by your marketing or creative agency relative to their fees. It answers the fundamental question: is the agency making you more money than they cost? Compare in-house vs outsourced approaches with the Freelancer vs Agency Calculator and track overall marketing returns with the Marketing ROI Calculator.
The Formula
Agency ROI = (Revenue Attributable to Agency Work − Total Agency Fees) ÷ Total Agency Fees × 100
Worked Example
A digital marketing agency charges a £3,000/month retainer and generates £12,000/month in attributable revenue.
- Monthly agency fees = £3,000
- Monthly attributable revenue = £12,000
- Monthly profit from agency = £12,000 − £3,000 = £9,000
- Agency ROI = (£9,000 ÷ £3,000) × 100 = 300%
📌 The agency delivers a 300% ROI — every £1 in fees generates £4 in revenue (£3 profit). This is strong performance that justifies the retainer.
Why This Matters
Budget justification
A clear ROI calculation turns the agency fee from a "cost" into an "investment" in board conversations. An agency delivering 300% ROI should receive more budget, not less — increasing their budget from £3K to £5K could generate £20K in revenue.
Agency selection
When comparing agencies, ROI is the only metric that matters. A £5,000/month agency delivering 400% ROI is cheaper than a £2,000/month agency delivering 100% ROI. Judge by returns, not fees.
Common Mistakes
❌ Measuring too early
SEO agencies need 4-6 months to show results. Content agencies need 3-6 months. Paid media agencies should show returns within 1-2 months. Judge each channel on its appropriate timeline, not a blanket 30-day review.
❌ Not separating agency fee from ad spend
If you pay £3,000 in agency fees and £10,000 in ad spend, the agency's ROI should be measured against their £3,000 fee only (managing the ads), not the £13,000 total. The ad spend is a separate investment with its own ROI.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Agency fee as % of ad spend | 10-15% | 15-25% | Above 30% |
| Agency ROI | 300%+ | 150-300% | Below 100% |
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