Profit improvement calculator.
Five levers drive your profit: leads, conversion, average sale, purchase frequency and margin. See what a small move on each one does, and why five gentle changes beat one big push. Every figure is illustrative.
What the levers do.
Revenue is not one number. It is five.
Most owners hold turnover in their head as a single figure that goes up or down for reasons that feel largely outside their control. It is not. It is the product of five things, each of which can be worked on separately:
- Leads — how many genuine enquiries reach you in a year.
- Conversion rate — the proportion of those enquiries that become customers.
- Average sale — what a transaction is worth.
- Purchases per customer — how often a customer buys in a year.
- Gross margin — what is left of each pound of revenue after the cost of delivering it.
Leads times conversion gives customers. Customers times purchases gives transactions. Transactions times average sale gives revenue. Revenue times gross margin gives gross profit. Gross profit minus fixed overheads gives net profit. That chain is the entire calculation, and you can check every line of it in the table above.
Why small moves on all five beat one big push
Four of the five levers multiply directly into revenue, and the fifth multiplies what is left of it. So a 5 per cent improvement applied to all five is not a 25 per cent improvement. It is 1.05 to the power of five, which is a multiplier of 1.2763 on gross profit — a 27.6 per cent rise. And because fixed overheads do not move when volume rises, all of that lands on the net profit line, where it looks considerably larger again.
That matters because of where the effort goes. Getting 27.6 per cent more leads is a campaign, a budget and a quarter of somebody’s life. Getting 5 per cent more leads, converting 5 per cent better, charging 5 per cent more, selling slightly more often and holding on to 5 per cent more of the margin is five conversations, most of which you could start this week. The tool shows both routes side by side so you can see the difference in effort for the same answer.
A worked example
The numbers the tool opens with are illustrative arithmetic, not a client. A business gets 500 leads a year and converts 25 per cent of them, so 125 customers. Each buys twice a year at an average sale of £900, which is 250 transactions and £225,000 of revenue. At a 45 per cent gross margin that is £101,250 of gross profit. Take off £60,000 of fixed overheads and net profit is £41,250.
Now move every lever by 5 per cent. Leads 525, conversion 26.25 per cent, so 137.8 customers. At 2.1 purchases each that is 289.4 transactions, at £945 each, giving revenue of £273,489. Gross margin goes to 47.25 per cent, so gross profit is £129,224. Overheads stay at £60,000, so net profit is £69,224 — up £27,974, or 68 per cent.
Each lever on its own is worth £5,063 of net profit here, and that is the same for all five, because they enter the chain the same way. Together they are worth £27,974, which is more than five times as much. To get the same result from leads alone you would need 638 leads instead of 500 — 27.6 per cent more — with everything else held exactly where it is.
The assumptions, stated plainly
- Every figure produced here is illustrative. It is a model of how the levers interact, not a forecast of your business.
- The improvement is applied as a relative uplift. A 5 per cent move on a 45 per cent gross margin takes it to 47.25 per cent, not to 50.
- Fixed overheads are held fixed while volume rises. That is true until you need another person, a bigger unit or a second van — and then it is very suddenly not. If growth would break a capacity ceiling, put the extra cost into the overheads box before you believe the answer.
- It says nothing about cash. A business can move all five levers, make more profit and still run out of money, because growth consumes working capital. That is a separate problem, covered in the profit versus cash guide.
- Conversion rate and gross margin are capped at 100 per cent, because neither can exceed it.
If the honest answer is that your margin is the weak lever, the price for profit guide works through what a price rise does and how many clients you could lose and still be better off.
Questions about this tool.
What counts as a lead?
A genuine enquiry from someone who could plausibly buy: an inbound call, a form submission, a referral introduction, a request for a quote. Not website visits, not social media followers, not a list you bought. The test is whether a human expressed interest in buying something you sell. Counting it strictly matters, because the conversion rate is calculated from it — and a flattering lead count produces a discouraging conversion rate, which sends owners off to fix the wrong lever entirely.
I do not know my conversion rate. What should I put?
Guess, look at the answer, then go and count. Most owners have never counted, and the guess is usually generous by ten or fifteen points. Counting is genuinely a one-hour job for most small businesses: pull last quarter’s quotes, mark each one won, lost or still open, and divide. What you learn from the exercise is often worth more than the calculator — particularly the pattern in the losses, which tends to cluster around one job type, one price point or one person doing the quoting.
Why is a 5 per cent move on each lever worth so much more than 5 per cent overall?
Because the levers multiply rather than add. Four of them go straight into revenue, and the fifth multiplies what survives as gross profit, so five moves of 5 per cent give a multiplier of 1.05 to the power of five, which is 1.2763 — a 27.6 per cent rise in gross profit. Then fixed overheads stay where they are, so every pound of that extra gross profit falls to the net profit line. That is why the percentage on the net profit line is so much larger than anything you typed in.
Is a 5 per cent improvement realistic?
On any single lever, usually yes, and that is rather the point. Five per cent more leads is one extra enquiry a fortnight for most small businesses. Five per cent on conversion is winning one more quote in twenty, which is often a follow-up call that currently does not happen. Five per cent on average sale is a modest price rise or one extra item. None of them individually is a transformation. That is the argument: the levers are chosen precisely because each move is small enough to actually be done.
Which lever should I work on first?
Whichever is both weakest and cheapest to move, which is rarely leads even though leads are what most owners reach for. Marketing spend is the slowest and most expensive of the five. Conversion, average sale and margin cost almost nothing to improve and produce results within a quarter, because they act on demand you have already paid to generate. A reasonable order for most small businesses is margin, then conversion, then average sale, then frequency, then leads — and if you are at capacity, put the price up before you generate a single extra enquiry.
Does this work for a service business with retainers?
Yes, with one translation. Purchases per customer becomes the number of billing periods a client stays in a year, so a monthly retainer held for a full year is twelve, and average sale is the monthly fee rather than the annual value. Everything else works unchanged. If your clients renew rather than repurchase, retention is quietly the strongest lever you have, because it multiplies through the same chain while costing nothing in acquisition.
Can I use this as a forecast?
No, and it says so on the page. It is a model of how five variables interact, not a prediction of what your business will do next year. It holds fixed overheads still, ignores seasonality, assumes the extra work can be delivered at the same margin and takes no view on cash at all. Its usefulness is comparative: it shows you which lever is worth the effort and why five small moves outperform one large one. Treat the pounds as a sense of scale rather than a number to put in a budget.
Want the five-lever worksheet?
We will send you the worksheet version of this: the questions to ask on each lever, the order to work them in, and what a realistic quarter of movement looks like on each one.
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