How many leads do you need? Start with the revenue goal and work backward. Subtract what you can reasonably expect from existing customers and from new business outside the marketing plan. Divide the gap by your average deal size to get the number of new deals. Divide that by your win rate to get qualified opportunities, then by the share of qualified leads that become opportunities, and you have the number of qualified leads you need. Use your own conversion rates instead of an industry average, and turn the annual number into a monthly rhythm someone can check.
Most companies do the opposite. The marketing plan starts with a lead target somebody guessed, or one the agency picked, and nobody can say how it connects to next year’s revenue. I don’t think you should hand that number to anyone else. As I put it when I talk about paid search, “I’d work backward from your own numbers.”
This article is for owners and leadership teams who have a revenue goal for next year and want to know whether the marketing plan can actually get them there.
The math, step by step
Here’s the whole chain, with made-up numbers you can swap for your own.
| Step | Question | Example (made up) |
|---|---|---|
| Revenue goal | What do you want next year? | $12,000,000 |
| Minus what you already expect | What will existing customers bring in, plus new business outside the marketing plan? | $10,400,000 |
| New-business gap | What has to come from new customers marketing helps win? | $1,600,000 |
| ÷ average deal size | How much does a typical new customer contribute in the year you’re planning? | $100,000, so 16 deals |
| ÷ win rate | What share of qualified opportunities do you win? | 40%, so 40 opportunities |
| ÷ lead-to-opportunity rate | What share of qualified leads become real opportunities? | 60%, so about 67 qualified leads |
| ÷ qualification rate | What share of raw inquiries turn out to be qualified? | 30%, so about 220 leads |
One detail matters in the deal-size step: use the amount a new customer contributes inside the year you’re planning, or plan against bookings and use that number all the way through. A customer who signs in October may contribute only a few months of revenue by December.
Spread across the year, that’s roughly six qualified leads a month, or one or two a week, out of about 18 inquiries a month. That’s the number worth putting in front of your marketing team or agency. It’s specific, it connects to revenue, and anyone can check it on a Monday morning.
Start with the gap
The step most calculators skip is the second one. If most of your revenue comes from existing customers, marketing’s job is the gap. First subtract what you can reasonably expect from customers you keep and grow, net of the ones you expect to lose. Then, separately, estimate new business that comes from outside the marketing plan, like owner-led relationships and referrals. Be conservative with that second number. A referral forecast isn’t booked revenue, and some referrals are helped along by marketing in the first place. Agree out loud what each source is expected to carry before anyone sets a lead target.
This matters more than it sounds. A company that sets marketing’s target from the whole revenue goal will ask for several times more leads than it needs, then conclude marketing failed when it doesn’t deliver them.
Count qualified leads, then let raw volume follow
Do the math from the qualified stage up. Raw inquiry volume is a by-product, and it depends heavily on what you count. A model that counts every download and newsletter signup as a lead will produce a far bigger lead target than one that counts only real prospects in your market, for exactly the same deals.
Count opportunities by company. Forrester’s B2B revenue waterfall moved its focus from individual leads to opportunities and the buying groups attached to them, because B2B purchases are made by groups. Three people from the same company may be three useful signals, but they’re one opportunity, not three leads converting at 33%.
Use your own conversion rates
Search for B2B conversion rates and you’ll find confident benchmarks, and they don’t agree. Industry figures for the share of leads that become customers are commonly quoted at around 1%. One SEO agency’s published client data multiplies out to about 2.3%. Both can be “right,” because they count a lead differently.
The same problem shows up with stage names. As I’ve written about grading sales prospects: “One company’s SQL is a first meeting, another’s is a deal that’s nearly closed. Write down what each stage means at your company before you measure anything against it.”
For what it’s worth, one SEO agency’s published client data puts B2B rates at roughly 39% from lead to marketing-qualified lead, 38% from marketing-qualified to sales-qualified, 42% from sales-qualified to opportunity and 37% from opportunity to close. Use numbers like that as a smell test at most, never as a budget input. They depend entirely on how that agency’s clients define each stage.
So use your own rates:
- Pull at least six months of history, ideally a full sales cycle, for each conversion step.
- Label what’s evidence and what’s a guess. Usually only one or two of your rates will be solid. Mark the rest as assumptions and set a date to replace them with real numbers.
- Run a low, middle and high case if you’re unsure. The spread tells you how much risk is in the plan.
If you have no data yet, start anyway. As I’ve put it about tracking leads in paid search, “You start with sensible guesses on the values and go back and do the real math once enough deals have closed.”
How much pipeline do you need? The 3x rule, explained
Pipeline coverage is the value of your open, qualified opportunities divided by the revenue you need to close in a period. The common advice is to carry three times your target, the “3x rule.”
The 3x rule has no clear original source. It’s a rule of thumb, and it only fits one set of numbers. As a Salesforce article on pipeline coverage put it in 2023: “The 3x pipeline coverage ratio works only when your win rate is exactly 33% and your sales cycle is exactly one year.”
A useful first pass is one divided by your historical win rate. If you win roughly 40% of comparable qualified pipeline, 2.5 times your target is the mathematical starting point. If you win 20%, it’s five times. Then adjust for what actually happens in your business: deal sizes, sales-cycle length and how often close dates slip, because deals that slip get harder to win the longer they sit. Two cautions: compare pipeline and target over the same period, and if you measure pipeline in dollars, use the share of pipeline dollars you win, since winning small deals and losing big ones distorts a count-based rate.
Coverage is also only as honest as the pipeline behind it. A pipeline full of maybes makes the forecast look better than the business will. Deals on a long sales cycle rarely die on a date anyone records; they go quiet and sit in the pipeline at full value. Decide in advance how long a deal can go silent before it counts as lost, and only count prospects you’ve actually qualified.
Long sales cycles change the timing
With a long sales cycle, the leads you need for next year’s revenue have to arrive well before next year. 6sense’s 2025 survey of nearly 4,000 B2B buyers found an average buying cycle of about ten months. Don’t use that as your planning assumption; use your own sales cycle. But the point holds: pipeline has to be built at least a full cycle ahead of the revenue it’s meant to produce.
That has two practical consequences.
The first cycle of new marketing will show cost and few closed deals. If your cycle is nine months, a program that starts in January may not close much before the fourth quarter, even if it’s working. Say so before the money is spent, so nobody cancels a working program in month four.
Judge early with earlier signals. While revenue catches up, look at what arrives first: the number of qualified leads against plan, the quality of the conversations, and who’s asking for proposals. B2B sales cycles are long, so not every answer arrives in ninety days.
When one deal is worth five
Averages break down when deal sizes vary a lot. If one large pursuit is worth as much as five typical deals, count it as five, and judge your pipeline in dollars, by the quarter. Otherwise a strong month followed by two empty ones looks like failure, when it’s just how big deals arrive.
Where marketing’s number ends and sales’ begins
The chain above crosses a handoff, and each side should own the part it can move.
Draw the handoff wherever your company actually makes it. In some companies sales takes over at the first qualified conversation; in others a business development team qualifies leads before sales accepts them.
Marketing should be accountable for the volume and fit of what it hands over. In my words, “marketing’s role is, in a word, to provide more qualified at-bats” for the people who sell.
Sales should be accountable for what happens after it accepts the handoff: how fast leads get followed up, how many become real opportunities and how many close. If qualification is shared, say so explicitly. Holding marketing to a revenue number it can’t move mostly teaches everyone to argue about attribution.
A few habits keep the split honest:
- Split shared numbers at the handoff so each team is measured on the part it controls, and the company is measured on the total.
- Feed outcomes back. Sales has to record which leads became opportunities and customers, including the ones you lost. Without that, nobody can calculate the conversion rates in the chain, and the ad platforms optimize blind.
- Tag the source on every opportunity: marketing-sourced, marketing-assisted or sales-sourced. Some marketing helps deals that arrive through referrals. If you judge each channel only by the leads it hands over directly, you’ll cut the ones doing quiet work.
Check the lead number against what you can afford
Once you know how many qualified leads you need, check whether the budget can produce them.
In my piece on choosing a marketing agency, I worked through what a company can afford to spend to win a customer, with made-up numbers: a $100,000 sale that leaves about $10,000 for marketing once delivery, overhead, a minimum profit and selling costs are backed out.
In the example above, a 40% win rate times a 60% lead-to-opportunity rate means about 24% of qualified leads become customers. At up to $10,000 per customer, that’s about $2,400 per qualified lead. Sixteen customers at $10,000, or about 67 qualified leads at $2,400, comes to about $160,000 a year: the most this plan should spend on marketing to win new customers. That figure covers only winning new customers. Keeping the customers you already have and paying for what marketing runs on come on top of it; the full budget, built from the same numbers, is in how much a company should spend on marketing. If producing that many qualified leads would cost more than that, something has to change. You can lower the goal, raise the budget, improve the rates (a better close rate is often cheaper than more leads), or decide not to run the campaign. As I said in a video about exactly this math, “not doing the campaign at all is a very real option.”
Five numbers to watch every month
Once the plan is set, a short monthly view tells you whether it’s getting healthier or falling behind long before the year ends:
- Revenue gap remaining against the new-business target.
- Qualified leads against plan.
- New qualified pipeline created against plan.
- Win rate on qualified opportunities.
- Pipeline coverage for the period ahead.
Common questions about lead targets
How do I calculate how many leads I need?
Take your revenue goal, subtract what existing customers and sources outside the marketing plan will bring in, divide by your average deal size, then divide by your win rate and your lead-to-opportunity rate. Use your own historical rates and split the annual result into a monthly target.
What is a good pipeline coverage ratio?
Start with one divided by your historical win rate, then adjust for deal sizes, cycle length and slippage. At a 40% win rate that’s about 2.5 times your target; at 25% it’s four. The popular 3x rule fits a win rate of about 33%.
What is a good B2B lead conversion rate?
There isn’t a reliable universal number, because companies define leads and stages differently. Published figures for leads becoming customers range from about 1% to a few percent. Your own rates, measured consistently, are the only ones worth planning on.
What’s the difference between an MQL and an SQL?
A marketing-qualified lead is one marketing judges worth passing to sales. A sales-qualified lead is one sales has accepted as a real prospect. The definitions vary a lot between companies, so write down what each means at yours before measuring anything against them.
How many leads should my website generate?
Work it out from the chain above. The website’s share depends on how much of your new business it’s expected to produce, and the quality of those leads matters more than the count.
Where to go from here
Write next year’s revenue goal at the top of a page, subtract what existing customers and referrals will bring, and work down the chain with your own rates. Then check the qualified-lead number against what you can afford to pay for each one.
Setting marketing’s number, splitting it fairly with sales and measuring it against the company’s goals is a central part of what I do as a fractional CMO. You can start a conversation on Work With Me.
