Benchmarks are useless without qualification rates attached. A cost per lead number on its own tells you nothing about whether your ad spend is working, because two firms paying the same amount per lead can be running businesses with completely different economics. Here is how to work backward from a signed case to a number you can actually hold your spend against.
Why the benchmark someone quoted you is useless
Someone at a conference tells you a good cost per lead for personal injury is a certain number. That figure came from a different market, a different case mix, and a different intake team. It is not portable.
Two firms in the same city can pay identical amounts per lead. One of them signs a meaningful share of those leads because they only bid on terms that describe real injury cases and their intake answers on the second ring. The other signs almost none, because half their leads are people looking for free legal advice about a parking dispute.
Same cost per lead. Wildly different cost per signed case. Only one of those numbers pays your rent.
Start from a signed case and work backward
The only sound way to set a target is to decide what a signed case is worth to you and how much of that you are willing to spend to acquire one. Everything else is derived from there.
You need four numbers before cost per lead means anything:
- Average fee per signed case, split by case type. Soft tissue and trucking are not the same business and should not share a budget target.
- Lead to consult rate. What share of raw leads reach a real conversation with someone qualified to assess the case.
- Consult to signed rate. What share of those conversations become signed cases.
- Acceptable acquisition cost as a share of fee. Most firms I work with land somewhere between ten and twenty five percent, depending on case type and how aggressively they are trying to grow.
If you cannot produce those four numbers from your case management system today, that is the first project. Not a new campaign, not a new agency. The reporting.
The arithmetic, in the order you should do it
- Take your average fee for one case type over the last twelve months.
- Multiply it by the share you are willing to spend on acquisition. That gives you a target cost per signed case.
- Multiply your lead to consult rate by your consult to signed rate. That gives you the share of raw leads that turn into cases.
- Multiply your target cost per signed case by that share. That is your target cost per lead.
- Repeat per case type and per channel, because both change the answer.
Run this once and you will usually find one of two things. Either your allowable cost per lead is far higher than what you are currently paying, in which case you are underspending and leaving cases to competitors. Or it is far lower, in which case the problem is almost never the ad platform. It is the qualification rate.
When cost per signed case is too high
There are only four levers, and they are not equally expensive to pull.
- Raise the consult to signed rate. This is intake and follow up, and it is usually the cheapest lever available.
- Raise the lead to consult rate. Speed of response, number of attempts, and who picks up the phone at 6pm.
- Improve lead quality at the source. Tighter match types, negative keyword work, and landing pages that describe the cases you want rather than every case you could theoretically take.
- Shift channel mix toward cases that close better, even if those leads cost more per lead.
Most firms reach for the third lever first because it feels like the marketing one. In practice the first two move the number faster and cost nothing but process. That is why I treat intake and sales enablement as part of the media plan rather than as a separate department.
Where cost per lead misleads even when the math is right
Channel averages hide the thing you need to see. Local Services Ads often produce the lowest cost per lead in the account and a poor cost per signed case, because the format invites calls from people who have not thought much about whether they have a case.
Brand search is the opposite. It looks cheap and converts beautifully, but most of those people were coming to you anyway, often from a referral or a billboard. Counting it as acquisition flatters the blended number and hides what your prospecting campaigns are really doing.
Organic is slower to show up in this math and usually better once it does. A practice area page that ranks keeps producing cases after the spend stops, which is why search work and paid campaigns should be budgeted against the same target rather than argued about separately. If you are scaling paid, it is worth reading what tends to happen to lead quality the moment you raise budgets.
What to look at weekly and what to leave alone
Weekly, look at lead volume by channel, contact rate, and consult volume. These move fast enough to be worth watching and they tell you whether the machine is running.
Monthly or quarterly, look at cost per signed case by case type and channel. Signed case data takes time to accumulate, and firms that judge a campaign on two weeks of it will turn off something that was working.
The reporting layer for this does not need to be sophisticated. It needs to connect the ad platform to the case management system so that a signed case can be traced back to its source. Getting that tracking honest is the first thing I do with law firm clients, and it is usually where the surprises are. You can see the shape of that work on the results page, and the broader approach at Holland Health Marketing.
Common questions
What is a good cost per lead for a personal injury firm?
There is no single figure worth quoting, because it depends entirely on your average fee and your signing rate. The useful version of the question is what your allowable cost per lead is, which you calculate from your own case data.
How much should a personal injury firm spend on Google Ads?
Spend up to the point where the marginal case still costs less than your target acquisition cost. That means the budget is an output of the math, not an input. Firms that pick a monthly number first tend to either stall growth or overspend on a channel that stopped working.
Why are my Local Services Ads leads cheaper but worse?
The format is built for volume and low friction, so it surfaces people earlier in their thinking. That is not a reason to turn it off. It is a reason to measure it on cost per signed case and to dispute the leads that clearly do not qualify, which most firms never bother to do.
How long before I can judge a new campaign?
Long enough to accumulate a meaningful number of signed cases, which for most firms means a quarter rather than a month. You can judge lead volume and contact rate much sooner. Judging case outcomes on a few weeks of data is how good campaigns get killed.
Should I track cost per lead or cost per signed case?
Track both, but make decisions on cost per signed case. Cost per lead is the early warning signal that tells you something changed this week. Cost per signed case is the number that tells you whether the change mattered.