What is Agency vs In-House Calculator?
The Agency vs In-House Calculator is a free, UK-focused tool that compares the total cost of hiring a marketing agency against building an in-house marketing team. It goes beyond basic salary figures to include employer National Insurance, pension contributions, recruitment fees, training budgets, software subscriptions, management overhead, and office space. The result is a true total cost of ownership for both options, delivered in minutes.
The calculator offers three levels of analysis—Quick (2 minutes, 5 questions), Detailed (5 minutes, 10 questions), and Comprehensive (8 minutes, 15 questions)—so you can choose the depth that fits your decision-making timeline.
Who it's for
- Marketing Directors and CMOs evaluating build vs buy decisions for their marketing function.
- Finance Directors and CFOs assessing marketing budget allocation and cost efficiency with hard numbers.
- Founders and CEOs deciding on marketing team structure, especially in growing SMEs scaling their operations.
Key features
Annual savings potential
The calculator estimates exactly how much you could save—or reinvest—by choosing one approach over the other. It shows first-year savings in clear monetary terms, making the financial case easy to present to stakeholders.
Break-even analysis
You'll see how many months it takes for your investment to pay off. This helps you understand the short-term cash flow impact of each option, not just the long-term totals.
Team size comparison
The tool compares how many specialists you gain access to with each approach. This is particularly useful when evaluating whether an agency's broader skill set outweighs a smaller in-house team.
Personalised recommendations
Based on your revenue, team size, and growth stage, the calculator provides custom advice. It doesn't just give you numbers—it tells you what those numbers mean for your specific situation.
What stands out
"The true cost of a £45,000 marketing executive is actually £65,000+ when you include employer NI, pension, benefits, recruitment, training, tools, and management time."
Most cost comparisons stop at salaries, but this calculator digs into the hidden expenses that routinely get overlooked. The 13.8% employer National Insurance, 3% pension auto-enrolment, recruitment fees of 15–25% of salary, and management overhead are all factored in. For a team of four, that can mean over £260,000 annually before a single pound is spent on advertising. The tool surfaces these costs in a way that makes the agency vs in-house decision far more transparent.
Worth checking out if…
You're a UK business owner, marketing leader, or finance professional facing a build vs buy decision for your marketing team. It's especially valuable if you're currently using an agency and wondering whether bringing marketing in-house would save money—or if you have an in-house team and are considering agency support. The calculator is free, takes as little as two minutes, and gives you a data-driven foundation for a decision that's often made on gut feel.
