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Marketing Calculators & Campaign Analytics Tools

Marketing without measurement is guesswork. Whether you are running paid search campaigns, managing a social media budget, or growing a subscription business, the ability to calculate ROI, track acquisition costs, and model the long-term value of customers determines whether marketing is a cost centre or a growth engine. These free marketing calculators cover the core metrics that every marketing function needs to track: return on investment, return on ad spend, customer acquisition cost, customer lifetime value, conversion rate, churn rate, and budget allocation across channels. Each tool is built around the formulas used by professional marketing and finance teams, so the outputs can feed directly into business decisions about where to invest, what to cut, and how to improve. Use these tools to turn campaign data into clear numbers — and clear numbers into better decisions.

What This Section Covers

Understanding Marketing Metrics

ROI: did this activity make more than it cost?

Return on investment (ROI) measures the net profit from a marketing activity as a percentage of what you spent on it. Positive means it made money. Negative means it lost money.

The hard part is attribution — knowing which revenue came from which activity. It is easy for paid search and email, where the click is traceable. It is much harder for brand campaigns, SEO and content, where the effect is indirect and slow.

Measure it anyway. Imperfect ROI data still produces better decisions than none.

ROAS is not the same as profit

Return on ad spend (ROAS) is gross revenue per pound of advertising. It ignores your cost of goods and everything else, which makes it useful for day-to-day decisions inside ad platforms — which campaign, which audience, which ad.

But a high ROAS does not mean you are making money. A campaign returning £5 per £1 spent (5x ROAS) only turns a profit if your gross margin is above 20%.

Always check ROAS against your gross margin to find the break-even point for a campaign.

CAC and LTV decide whether the model works at all

Customer acquisition cost (CAC) is your total sales and marketing spend divided by the number of new customers it won.

Customer lifetime value (LTV) is what a customer is worth over the whole relationship: average order value, times how often they buy, times how long they stay, minus what it costs to serve them.

The ratio between them is the number that matters. Below 1:1 you spend more to win a customer than they are ever worth — that cannot last. 3:1 or better is the benchmark for a business that can scale.

Churn compounds, which is why it is dangerous

Churn rate is the share of customers you lose in a period. A monthly rate of 3–5% sounds small. It means losing a third to half of your customer base every year.

The cost is easy to understate. Losing a customer who would have produced £1,000 of gross profit over two years is not one lost sale — it is the whole future stream from that relationship.

Cutting churn by a single percentage point usually beats an equivalent gain in new customers, because every customer you keep keeps paying without costing you anything to acquire again.

Conversion rate optimisation pays best when traffic already exists

Conversion rate is the share of visitors who do what you wanted — buy, fill in a form, start a trial.

Small improvements compound against your traffic. Take a landing page with 10,000 visitors a month: lifting conversion from 2% to 2.5% moves you from 200 to 250 customers. That is 25% more output from the same traffic.

At a CAC of £50, that is £2,500 of extra customer value for no additional ad spend. The Conversion Rate Calculator models what any improvement is worth.

Budget allocation follows the channel data

Deciding where the money goes needs per-channel numbers: CAC, LTV and ROAS for each source.

Put the most budget behind channels with the lowest CAC and highest LTV. Cut or drop anything with negative ROI.

A common split is 70% to proven channels, 20% to ones that are growing, and 10% to experiments. The Budget Allocation Calculator models revenue, profit and blended ROI across up to eight channels at once.

Available Marketing Tools

How to Use These Tools Effectively

Start with the metrics that define whether your marketing is fundamentally sound. Use the Customer Acquisition Cost Calculator and the Customer Lifetime Value Calculator together to establish your LTV:CAC ratio. If that ratio is below 3:1, either acquisition costs are too high or customer retention needs improvement — diagnose which by also running the Churn Rate Calculator. High churn reduces LTV and makes it structurally difficult to achieve a healthy LTV:CAC ratio no matter how efficient your acquisition is.

For campaign analysis, use the ROI Calculator and ROAS Calculator together. ROAS tells you which ad campaigns are generating revenue most efficiently; ROI tells you whether those campaigns are actually profitable once you factor in product costs and overheads. Use the Conversion Rate Calculator to model the revenue impact of improving your landing page or checkout flow — this often reveals that CRO investment delivers a better return per pound than incremental ad spend.

For budget planning, the Marketing Budget Allocation Calculator allows you to model expected revenue and blended ROI across all your channels before committing spend. Use it at the start of each quarter to stress-test your planned allocation and identify whether the expected returns justify the planned investment. For social media specifically, the Social Media ROI Estimator calculates cost per lead and cost per acquisition, which can then be fed into the CAC calculator for a complete acquisition cost picture. For the business impact of marketing metrics like CAC and LTV on overall company valuation, see the Business KPIs Dashboard in the business calculators section.

Frequently Asked Questions

What is marketing ROI and how is it calculated?
Marketing ROI measures what an activity returned against what it cost. Subtract the cost from the revenue it generated, divide by the cost, then multiply by 100. A campaign costing £5,000 that generates £20,000 of revenue has an ROI of 300%. The hard part is attribution — knowing which revenue came from which activity. It is straightforward for direct-response channels such as paid search, email and social ads, where the click is traceable. It is much harder for brand campaigns and content marketing, where the effect is indirect and often delayed by months. Measure it anyway: imperfect attribution still produces better decisions than none.
What is the difference between ROI and ROAS?
They answer different questions. ROAS measures gross revenue per pound of ad spend, so a ROAS of 4 means £4 back for every £1 spent. It ignores cost of goods and every other expense, which makes it a top-line efficiency measure rather than a profit measure. ROI measures net profit against total investment, including ad spend, production, agency fees and everything else. This is why a campaign can post a strong ROAS and still lose money: at a 20% gross margin, a 4x ROAS only breaks even. Use ROAS for day-to-day decisions inside ad platforms. Use ROI to judge whether the campaign was actually worth running.
What is a good LTV:CAC ratio?
The LTV:CAC ratio compares what a customer is worth against what they cost to win. The benchmark for a healthy, scalable business is 3:1 — each customer returns three times their acquisition cost. Below 1:1 you lose money on every customer, and no amount of growth fixes that. Between 1:1 and 3:1 is marginal: either acquisition is too expensive or you are not retaining and monetising well enough. Above 5:1 usually means you are under-investing. You could profitably acquire more customers by spending more. Track the ratio over time and split it by channel, because LTV and CAC vary enormously between them.
What is customer churn rate and how does it affect revenue?
Churn rate is the share of customers who leave in a given period. To find monthly churn, divide the customers lost during the month by the number you had at the start. The damage comes from compounding. Losing 5% a month does not cost you 5% a year — it costs roughly 46% of your customer base. At 2% monthly churn you keep about 79% of customers over a year. For subscription businesses, cutting churn beats winning new customers by the same margin. Every customer you retain keeps paying without costing anything more to acquire, and they stay in the base that generates next year's revenue too.
What is a good conversion rate for a website?
It depends heavily on your industry, traffic source and what counts as a conversion. E-commerce typically runs between 1% and 4%, with strong performers reaching 5–8%. Lead generation forms convert higher, often 5–15% on a well-targeted landing page. Paid search usually beats organic and social because the intent is stronger. Benchmarking against industry averages is less useful than it looks. Track your own rate over time and test changes systematically instead. The reason this matters: a 20% lift in conversion rate produces the same revenue as a 20% lift in traffic, and usually costs far less to achieve.
How should I allocate a marketing budget across channels?
Start with the channels that have historically delivered the lowest CAC and the highest LTV. Where you lack that data, a common starting split is 70% to proven channels with demonstrated positive ROI, 20% to emerging channels that show promise, and 10% to experiments. Early-stage businesses should test new channels at small scale before committing real budget. Two views are worth keeping side by side. Blended CAC and ROAS across all channels tell you whether total marketing spend is working. Channel-level figures tell you where to push more in and where to pull back.