How Many Leads Do You Actually Need to Hit Your Revenue Goal?

Guessing at your lead budget is optional

Ask most contractors how they set their lead spend and you’ll hear some version of “we spend what we can and hope it’s enough.” That’s not a plan — it’s a shrug with a dollar sign. And it’s completely avoidable, because the number of leads you need isn’t a mystery. It’s a calculation, and it runs backward from the one figure you already care about most: the revenue you’re trying to hit.

Start there and every other number falls into place — how many jobs, how many leads, how big a budget. Let me walk the formula, then show you why it quietly makes the case for exclusive leads over shared ones.

The formula, in three steps

Here’s the whole thing. You need four numbers you either know or can pull from your CRM: your revenue goal, your average job value, your book rate, and your cost per lead.

1. Revenue goal ÷ average job value = jobs needed. How many jobs it takes to get to the number.
2. Jobs needed ÷ book rate = leads needed. How many leads it takes to book that many jobs.
3. Leads needed × cost per lead = budget. What you have to spend to buy those leads.

That’s it. Three divisions and a multiplication, and you’ve turned “spend what we can” into a real target with a real budget attached.

A worked example: a plumbing shop chasing $120K

Say you run a plumbing business and you want an extra $120,000 in revenue from paid leads this year. Your average job is worth $1,500.

• Jobs needed: $120,000 ÷ $1,500 = 80 jobs.

Now book rate. This is the number most owners don’t track and desperately should, because it changes everything downstream. Say you close one in three leads you can actually reach and work — a reasonable rate on leads that are exclusively yours.

• Leads needed: 80 ÷ 0.33 = about 240 leads.

Finally, cost per lead. If you’re buying shared leads — Thumbtack runs around $46, and other platforms land $25 to $100 or more — plug in, say, $50:

• Budget: 240 × $50 = $12,000 to hit the goal.

Except that $50 lead isn’t exclusive, which breaks the assumption we just used. Here’s where the formula gets honest.

Book rate is the lever everyone ignores

Go back to step 2 and watch what happens when the book rate moves. A shared lead goes to four or five pros at once, which caps your win rate no matter how good your sales process is. Realistically that pushes your book rate down toward one in five.

• Leads needed at a 1-in-5 book rate: 80 ÷ 0.20 = 400 leads.
• Budget at $50 each: 400 × $50 = $20,000.

Same 80 jobs. Same revenue goal. But because the book rate fell from one-in-three to one-in-five, you now have to buy 160 more leads and spend $8,000 more to land the identical amount of work. The book rate didn’t just nudge the budget — it blew it up. This is the single most expensive number in your whole plan, and it’s the one shared leads quietly degrade.

Even channels that don’t resell your lead show the effect. Google Local Services Ads run a blended $53 per lead, and even there the best-case book rate is 43.9% — the best case, on a channel that gives you exclusive contact. Halve that book rate, which is roughly what sharing a lead does, and you double the leads you have to buy. Every figure here is sourced on our stats page.

What the exclusive-lead version does to the plan

Now run the formula with an exclusive lead. It’s yours alone, never resold, so your book rate isn’t capped by four competitors racing you to the phone — it’s back to what your own work and follow-up can earn, closer to that one-in-three. And a recovered consented visitor costs a flat $7.

• Leads needed at a 1-in-3 book rate: 80 ÷ 0.33 = about 240 leads.
• Budget at $7 each: 240 × $7 = $1,680.

Set the two plans side by side. The shared-lead route to 80 plumbing jobs: 400 leads, $20,000. The exclusive route to the same 80 jobs: 240 leads, $1,680. The formula didn’t change — the inputs did. A higher book rate shrank the leads you need, and a low flat price shrank the cost of each one. You win from both directions at once.

The number most owners get wrong: their real book rate

The formula is only as honest as the book rate you feed it, and this is where plans quietly fall apart. Most contractors overestimate their book rate — they remember the leads they closed and forget the ones that ghosted, no-showed, or were never reachable in the first place. If you punch in “we close half our leads” when the real figure is one in four, your plan will call for half the leads you actually need, and you’ll spend the year wondering why the revenue goal keeps slipping.

So measure it instead of guessing. Over the last 90 days, count the leads you got from a source and the jobs that source actually produced, and divide. That’s your real book rate for that channel — usually lower than the number in your head, and different for every source. It’s worth doing per source precisely because the spread is so wide: a referral might book one in two, a shared platform lead one in six. Feeding a blended average into the formula hides that gap and leads you to over-invest in the weak channel. Once you have honest, per-source book rates, the leads-needed math stops lying to you, and you can see at a glance which channel needs 240 leads to hit your goal and which one needs 600. That comparison, more than any per-lead price, is what should decide where the budget goes.

Put the formula to work this quarter

• Pull your four numbers. Revenue goal, average job value, book rate by source, cost per lead by source. Your CRM — Jobber, Housecall Pro, ServiceTitan — has the raw data if you tag lead source.
• Run the three steps per channel. Jobs needed, leads needed, budget. Do it for each source you use so you can compare apples to apples.
• Treat book rate as the lever. Before you go hunting for cheaper leads, ask what would happen if you stopped splitting every lead with four competitors. That usually moves the budget more than any price you could negotiate.
• Favor exclusive. An exclusive lead protects the book rate that drives the whole calculation.

You don’t need to guess at your lead spend ever again. Start from the revenue you want, run it back through job value, book rate, and cost per lead, and the budget writes itself. When you’re ready to plug in real prices, see flat $7 exclusive-lead pricing and put the channels side by side on our comparison breakdown.