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When a business is falling behind its sales targets, the natural response is often to increase marketing spend, generate more leads and give the sales team more opportunities to work with.
It’s understandable. If the pipeline isn’t delivering enough revenue, filling it with more prospects seems the obvious solution.
But what if the problem isn’t the number of leads you’re generating? What if you’re already attracting enough potential customers, but too few are progressing through your sales funnel?
For B2B businesses with relatively high-value products or services, even modest improvements in conversion can make a substantial difference to revenue. Before investing more money in generating demand, it’s worth understanding exactly where your existing sales funnel is performing well, where opportunities are being lost and what improving those areas could be worth.
That’s why we’ve developed a free B2B Sales Funnel Calculator. It helps businesses assess their current performance, estimate their revenue against target and explore whether generating more leads or improving conversion could offer the better route to growth.
A B2B sales funnel calculator is a tool that uses your lead volumes, conversion rates, average deal value and sales targets to estimate how much new business your current sales process could generate.
Rather than measuring marketing performance purely through enquiries or leads, it connects those activities to the outcomes that matter commercially: qualified opportunities, new customers and revenue.
A useful sales funnel calculation should help answer several questions.
Understanding these figures makes it easier to decide where to invest your sales and marketing budget.
The simplest way to calculate projected new business revenue is to multiply your annual marketing-qualified leads by your opportunity conversion rate, sales win rate and average first-year deal value.
Projected annual revenue = Annual MQLs × Opportunity conversion rate × Sales win rate × Average first-year deal value
For example, imagine a B2B business with the following figures:
| Sales funnel metric | Current performance |
|---|---|
| Marketing-qualified leads per month | 40 |
| Marketing-qualified leads per year | 480 |
| Leads converting into opportunities | 8% |
| Opportunities converted into customers | 25% |
| Average first-year deal value | £25,000 |
Based on these figures, the business could expect approximately 38 genuine sales opportunities each year, resulting in around 10 new customers and £250,000 in first-year revenue.
Now consider what happens if the company improves its lead-to-opportunity conversion rate from 8% to 10%, without generating a single additional lead.
The same 480 leads would produce 48 opportunities, resulting in approximately 12 new customers and £300,000 in first-year revenue.
That’s an additional £50,000 in projected revenue, simply from improving the way existing leads progress through the sales process.
These are illustrative calculations, not guaranteed results. They assume the quality of opportunities and sales win rate remain consistent, and that the sales team can manage the additional workload.
Nevertheless, they demonstrate why increasing lead volumes shouldn’t automatically be the first response to a revenue shortfall.
To calculate the number of leads required to achieve a particular revenue target, you need three figures: your average first-year deal value, the percentage of opportunities you win and the percentage of leads that become opportunities.
The calculation works backwards from your revenue target.
Required leads = Revenue target ÷ (Average deal value × Opportunity conversion rate × Win rate)
Using our previous example, suppose the business wants to generate £500,000 in new business revenue.
With an average first-year deal value of £25,000, it needs to win 20 customers.
At a 25% opportunity win rate, it needs 80 genuine sales opportunities.
If 8% of marketing-qualified leads become opportunities, the business needs approximately 1,000 leads annually, or 84 per month.
However, improving its opportunity conversion rate to 10% reduces the requirement to 800 leads annually, approximately 67 per month.
That difference matters. Generating another 17 qualified leads every month could require considerable additional marketing investment, whereas improving conversion might involve better qualification, more consistent follow-up or changes to the sales development process.
Of course, conversion improvements also have costs, and there are situations where generating more demand will deliver the better return.
The important point is to understand both options before deciding.
There are several common reasons why marketing activity fails to translate into the expected level of sales revenue.
Generating an enquiry is only the beginning of the sales process.
A prospect might download a whitepaper, attend a webinar, request information or engage with a marketing campaign without being ready to commit to a sales meeting.
If those leads receive one email or one telephone call before being marked as unresponsive, a considerable amount of potential demand may never be properly qualified.
This is particularly important for businesses with long sales cycles, where buyers may spend months researching suppliers before making a decision.
Consistent, relevant follow-up helps establish whether there is a genuine requirement, when the prospect is likely to buy and what needs to happen before an opportunity can progress.
Your most experienced salespeople are usually most valuable when they’re managing qualified opportunities, developing proposals, negotiating and closing business.
However, many sales teams are also expected to prospect, qualify marketing leads, follow up event attendees and maintain relationships with companies that aren’t ready to buy.
When workloads increase, longer-term opportunities can easily slip down the priority list.
Separating lead development from closing activity, whether through an internal SDR team, outsourced support or a hybrid approach, can improve coverage without distracting salespeople from their highest-value responsibilities.
Generating 100 leads from organisations that don’t match your ideal customer profile is unlikely to be more valuable than generating 20 leads from businesses that could realistically become customers.
Before evaluating conversion rates, it’s important to establish what proportion of your leads are actually relevant.
Are they the right size of organisation? Do they operate in your target sectors? Is there a potential need for your product or service? Are you engaging people who can influence a purchasing decision?
Lead volume alone tells you relatively little about the commercial potential of your marketing activity.
One of the biggest challenges in B2B sales is that potential customers don’t necessarily need your product or service when you first contact them.
A prospect could be an excellent fit for your business but have another two years remaining on an existing contract. Another might be considering a new supplier in the next three months.
Treating both prospects the same way is unlikely to produce the best results.
Understanding buying cycles, monitoring relevant triggers and maintaining contact with future opportunities can help businesses engage prospects when there is a realistic chance of a sale.
Most established B2B organisations already have a valuable source of potential new business sitting in their CRM.
Previous enquiries, lost opportunities, lapsed customers, event contacts and prospects who weren’t ready to buy at the time may all warrant another conversation.
Yet many of these contacts receive little or no further attention once the initial sales activity ends.
Before spending money acquiring more contacts, reviewing the opportunities already in your database could reveal a more immediate route to pipeline growth.
The answer depends on where your sales funnel is underperforming.
If your sales team is converting a high proportion of qualified opportunities but doesn’t have enough conversations to maintain its pipeline, generating more demand may be the priority.
If marketing is already producing plenty of relevant leads but relatively few become opportunities, the greatest improvement may come from better qualification and follow-up.
And if plenty of qualified opportunities are entering the pipeline but too few are closing, the issue may sit further down the sales process.
There’s another consideration that often gets overlooked: the size of your addressable market.
If you sell to a relatively small number of organisations with long buying cycles, continually trying to generate new leads from the same audience may become less effective over time.
In that situation, maintaining relationships with the right prospects and recognising when they’re ready to buy can be more valuable than simply increasing campaign volume.
Ultimately, the best strategy is rarely just about generating more leads or improving conversion. It’s about identifying which activity will make the biggest contribution to your revenue target, at a commercially sensible cost.
There isn’t a single conversion rate that every B2B organisation should aim for.
Performance varies depending on the industry, average deal value, lead source, sales cycle, target market and how each business defines its sales stages.
For example, a company receiving inbound demonstration requests from organisations actively researching its product may achieve very different conversion rates from a business generating early-stage interest through educational content.
The same applies to sales win rates. A business selling a £5,000 service with a short sales cycle will have a different sales process from one selling a £250,000 enterprise software solution involving multiple decision-makers.
Published industry benchmarks can provide useful context, but they shouldn’t be treated as universal targets.
The most useful starting point is to understand your own conversion rates, examine how they’ve changed over time and identify whether particular lead sources, customer segments or stages of the process consistently perform better than others.
A common mistake when forecasting sales growth is assuming that increasing lead volumes will automatically result in a proportional increase in revenue.
But what happens when your sales team is already operating at capacity?
An additional 50 leads a month may look attractive on paper, but if your salespeople can’t properly qualify and progress the resulting opportunities, conversion rates may deteriorate.
That is why sales capacity needs to be considered alongside marketing performance.
How many opportunities can each salesperson manage effectively? How much time do they spend developing early-stage prospects rather than closing qualified business? Could an additional sales development resource improve the overall productivity of the team?
Increasing activity without addressing these constraints can create a larger pipeline without producing the expected increase in revenue.
At Shortlist Marketing, we’ve spent over 15 years helping B2B organisations generate new opportunities and convert existing demand into qualified sales pipeline.
One thing we’ve learnt is that the answer to improving sales performance isn’t always more marketing activity.
Sometimes businesses need to reach more of their target market. Sometimes they need to get better at converting the interest they’re already generating. Often, it’s a combination of both.
To help businesses make a more informed decision, we’ve developed a free B2B Funnel Calculator.
Using 12 questions about your target market, lead volumes, conversion rates, deal values and sales capacity, it helps you explore:
The calculator also considers customer lifetime value, helping you understand how the commercial value of new business can extend beyond the initial contract.
It’s free to use, requires no registration and doesn’t ask for your email address. The results are estimates designed to support commercial planning, rather than guaranteed revenue forecasts.
Try the Free B2B Sales Funnel Calculator
A lead is an individual or organisation that has demonstrated some level of interest or been identified as a potential customer. A marketing-qualified lead (MQL) meets criteria established by the marketing and sales teams, while a genuine sales opportunity has progressed to a point where there is a recognised potential requirement and a realistic prospect of purchasing. Definitions vary between businesses, so consistent CRM reporting is essential.
Start by reviewing lead quality, response times, qualification processes and the number of follow-up attempts. Identify where relevant prospects are being lost, then test improvements such as more personalised outreach, better sales and marketing handovers, structured lead nurturing and dedicated sales development support.
Subtract your projected new business revenue from your annual new business revenue target. If your target is £1 million and your current funnel is projected to generate £650,000, your revenue gap is £350,000. You can then calculate the additional leads, opportunities or conversion improvements required to close that gap.
Yes, particularly when a business already generates a substantial number of relevant leads but converts relatively few into genuine sales opportunities. However, the most profitable option depends on the costs of generating additional demand, the resources needed to improve conversion and the quality of the resulting opportunities.
Most businesses benefit from monitoring lead and opportunity performance monthly, with a more detailed quarterly review of conversion rates, lead sources, sales capacity, average deal value and pipeline performance. Businesses with longer sales cycles should also examine trends over a sufficient period to avoid drawing conclusions from small samples.
When sales targets are missed, generating more leads can feel like the obvious solution. Sometimes it is.
But without understanding how your existing funnel performs, you could be investing more money in the wrong part of the process.
A clear picture of your target market, lead volumes, conversion rates and sales capacity allows you to make better decisions about where to focus your resources.
Before increasing your marketing budget, find out what your current sales funnel could be worth.
Explore how we could take the stress away from your win/loss analysis.
SDRs focus on nurturing and qualifying leads, ensuring only the most relevant prospects enter your sales pipeline.
