Start with revenue, not leads
The right way to calculate your required lead volume is to work backwards from your revenue goal. Most businesses approach this the wrong way — they ask "how many leads can we afford?" rather than "how many leads do we need to hit our target?" The first question leads to an arbitrary number. The second leads to a number with a purpose.
To get to your required weekly lead volume, you need four pieces of information:
- Your monthly revenue target — how much new revenue do you need to generate per month?
- Your average sale value — what is the average value of a new customer or contract?
- Your conversion rate — what percentage of qualified leads do you currently convert into sales?
- Your average sales cycle length — how many weeks does it typically take from first conversation to closed deal?
The calculation
Once you have those four numbers, the calculation is straightforward:
Step 1: Divide your monthly revenue target by your average sale value to get the number of sales you need per month.
Example: £20,000 target ÷ £2,500 average sale = 8 sales per month
Step 2: Divide your required number of sales by your conversion rate to get the number of leads you need per month.
Example: 8 sales ÷ 15% conversion rate = 54 leads per month
Step 3: Divide by four to get your required weekly lead volume.
Example: 54 ÷ 4 = approximately 14 leads per week
What conversion rate should you use? If you have historical data, use it. If you are starting from scratch, a conservative benchmark for qualified outbound callback leads is 10–20% depending on your sector, your average deal size, and how quickly your team follows up. Higher-value, longer-cycle sales tend to convert at the lower end. Shorter-cycle, lower-value sales can convert significantly higher. Read more about why leads fail to convert if your current rate is lower than expected.
Why your conversion rate matters more than your lead volume
The most important variable in this calculation is not how many leads you receive — it is how many you convert. A business receiving 20 leads per week and converting 25% of them is generating 5 sales per week. A business receiving 30 leads per week and converting 10% is generating 3 sales per week — from 50% more leads.
Before increasing lead volume, it is always worth understanding whether your current conversion rate can be improved. Our article on how to follow up a warm lead and our guide on converting a callback lead into a sale cover the most impactful improvements most sales teams can make.
How your sales cycle affects the number you need
If your average sales cycle is four weeks — from first conversation to signed contract — you need to be generating today the leads that will become sales in four weeks' time. This means that when you start a new campaign, there is a pipeline lag before the revenue impact is visible. Building the pipeline early is what allows you to hit targets consistently rather than scrambling to catch up.
Our article on how to build a sales pipeline from scratch covers this in detail, including how to structure your pipeline stages so you always have visibility on what is coming and when.
Worked examples across different businesses
To make the calculation concrete, here are three worked examples across different sectors and business sizes.
Example 1: A financial services IFA practice
Monthly revenue target: £15,000 from new clients. Average new client value: £2,000 per year. Sales per month required: 7-8. Realistic conversion rate from qualified outbound callback leads: 15-20%. Required leads per month: approximately 40-50. Required leads per week: 10-12.
Example 2: A home improvement company (windows and doors)
Monthly revenue target: £25,000 from new jobs. Average job value: £1,500. Sales per month required: approximately 17. Realistic conversion rate from qualified callback leads: 25-30% (shorter cycle, more urgent need). Required leads per month: approximately 55-70. Required leads per week: 14-18.
Example 3: A B2B professional services consultancy
Monthly revenue target: £20,000 from new contracts. Average contract value: £5,000. Sales per month required: 4. Realistic conversion rate from qualified outbound callback leads: 10-15% (longer cycle, more complex decision). Required leads per month: approximately 27-40. Required leads per week: 7-10.
These are illustrative benchmarks — your actual conversion rate will depend on your sector, the quality of your follow-up, the strength of your proposition, and how well the campaign brief has been defined. Our article on how to brief a lead generation agency covers how to set the campaign up to maximise the conversion rate from the start.
What to do when you do not know your conversion rate
If you are starting from scratch with no historical data, use a conservative estimate — 10% is a reasonable floor for most outbound callback lead campaigns, 20% a reasonable ceiling for well-run campaigns in favourable sectors. Build your required lead volume calculation around the conservative figure, then as you generate real data, refine the estimate based on what you actually see.
The most important thing is to start measuring. After four to six weeks of a campaign, you will have enough data to calculate a real conversion rate and refine your required weekly volume accordingly. Until then, the conservative estimate keeps you honest about what you actually need rather than what you hope will be enough.
How sector affects required volume
Different sectors have very different conversion rates and average deal values, which means the required weekly lead volume varies significantly by industry.
A financial services firm with an average client value of £3,000 per year and a conversion rate of 20% needs far fewer leads per week to hit a £10,000 monthly target than a home improvement company with an average job value of £800 and a conversion rate of 30%.
When we build a campaign brief with clients — whether in London, Bristol, or Edinburgh — we always work through this calculation before agreeing a weekly lead volume. The number that makes sense for your business is specific to your sector, your average deal value, and your team's capacity to follow up.
What to do with the number
Once you know your required weekly lead volume, you have a concrete target to build your lead generation activity around. You can evaluate any lead generation approach — outbound, paid advertising, referrals — against a simple question: can this realistically deliver X qualified leads per week at a cost that makes commercial sense?
For context on what qualified outbound leads cost relative to other channels, see our article on how much lead generation costs in the UK. Then get in touch with your numbers and we will tell you exactly what a campaign to deliver your required volume would cost each week. You can also review our pricing or see how our process works before reaching out.