What is a good cost per case for a law firm?

There is no reliable cross-industry answer, and any single figure offered as one is an average across firms with different fee structures, markets and capacity. The usable test is internal: cost per case against average fee earned per matter. Decide what share of gross fee you are willing to spend on acquisition, then judge every channel against that ceiling instead of against another firm's number.

Is cost per case the same as cost per acquisition?

In legal marketing they are usually used interchangeably, but cost per acquisition (CPA) comes from ecommerce, where the acquisition is a completed purchase. The equivalent event in a law firm is a signed fee agreement, not a lead and not a consultation. If a vendor reports CPA, ask which event they are counting before you compare it to anything.

How do I calculate cost per case when clients take months to sign?

Hold the cohort rather than the calendar. Attribute a month's spend to the cases that eventually sign from leads generated in that month, and report the figure as provisional until the practice area's usual signing window has passed. A rolling twelve-month window is the alternative: it hides the lag rather than handling it, but it is defensible as long as you state which method produced the number.

Should cost per case include intake staff time?

Yes, and it is the easiest line to leave off, because no invoice ever names it. Intake labor is what separates a cheap channel from a good one. A channel producing four times the inquiries for the same number of signings consumes roughly four times the screening time, and none of that appears on an advertising invoice. Use a loaded hourly rate and an honest estimate of hours rather than leaving the line at zero.

How do I track cost per case by channel without buying new software?

Add one required source field to the intake record, populate it at first contact rather than at signing, and reconcile it monthly against analytics and call records. Self-reported source is unreliable, so treat it as an approximation rather than a record. A rough number maintained every month is worth more than an exact number nobody ever computes.

Part of: Marketing attribution

Cost Per Case: The Law Firm Marketing Metric That Decides Every Other One

By Mohammad Kashif, Chief Technology OfficerLast updated September 21, 2026

Cost per case is total marketing spend for a channel divided by the signed cases that channel produced in the same period. It sets the ceiling on what you can pay per lead, per click and per month.

A worked example, not a benchmark: two channels both report a $120 cost per lead. At one signing in eight the case costs $960. At one in forty it costs $4,800. Same cost per lead, fivefold difference in cost per case, and the cost-per-lead figure cannot show you the gap.

How to calculate cost per case for a law firm

The formula is one line: all spend attributable to a channel in a period, divided by the signed cases attributable to that channel from the same period. Two words carry the difficulty, and both get skipped. "Attributable" decides what goes in the numerator. "Same period" decides whether the division means anything at all.

The numerator fails in one direction far more easily than the other. The media invoice is the part that arrives as a bill, so it gets counted. The retainer, the content production, the call tracking line and the hours intake spends working through inbound that was never going to sign never arrive as one, so they get skipped. A cost per case built from media spend alone will always flatter the channel, and it will flatter the broadest channel most, because breadth is exactly what pushes cost off the invoice and onto your staff.

The denominator is harder, because signing lags spending. A personal injury inquiry can sign inside a week. An estate plan can sit for a year. Dividing this month's spend by this month's signings compares two unrelated cohorts and produces a number that moves for reasons nobody can explain. Either hold the cohort, meaning spend from March against the cases that eventually sign from March-sourced leads, or use a rolling window long enough that the lag averages out. Both are defensible. Not saying which one you used is not.

Media spend, including platform and placement fees.
The retainer, salary or share of salary belonging to whoever runs the channel.
Content, video and photography produced for that channel specifically.
Call tracking, scheduling and any tooling that exists only because the channel exists.
Intake labor spent screening leads from that channel. No invoice ever names it, which is what makes it easy to omit, and it is the line most likely to change which channel ranks first.

Why cost per lead hides what cost per case shows

A lead is a form submission or a phone call. A case is a signed fee agreement. Between them sits a conversion rate that varies by channel, by practice area, by city and by hour of day, and that rate is the single largest multiplier on the real cost. A channel reporting the cheapest cost per lead can be the most expensive channel the firm runs, and nothing in the cost-per-lead figure would show it.

Run the formula on a number you can check rather than one you have to trust. The published entry price on our plan ladder is $599 a month, so a firm one quarter in has spent $1,797 on that channel. If the case management system shows three signed cases sourced to it, the cost per case is $599. If it shows one, the cost per case is $1,797. If it shows none, the cost per case is not zero and it is not infinite: it is undefined, and the honest report says the channel has not produced a signed case yet rather than reaching for an impression count instead.

Three numbers sit between spend and a signed case. Publishing all three internally, every month, is what stops the argument about which channel is working, because it locates the failure instead of scoring it.

The share of inbound that was never eligible. A wrong-jurisdiction or wrong-practice-area inquiry is a media targeting problem, not an intake problem.
Lead to consult. Mostly a function of response speed and of whether the inquiry reached a human at all.
Consult to signed. Mostly a function of fit and of the conversation, and the step marketing has least influence over.

What counts as a good cost per case, and who decides

No cross-industry number answers this, and the figures circulating as answers are rarely traceable to a measurement you can inspect. The ceiling is set inside your firm by one ratio: what the average matter earns against what you paid to open it.

On contingency work the arithmetic is simple and uncomfortable. Suppose the average fee on a settled matter is $9,000 and the cost per case is $3,000. A third of gross revenue on that matter went to acquisition before anyone did legal work. Whether that is fine or fatal depends on your cost base, your capacity and how many of those matters resolve, none of which appear in a benchmark. On flat fee work the constraint is different and easier: the fee is known before the matter opens, so the ceiling is fixed and volume is the only variable left.

The table below carries no benchmark figures, and that is deliberate. LexGrow has three client firms in production, which is a client list rather than a benchmark dataset, so we have nothing to publish a range from, and the dollar ranges circulating elsewhere are rarely traceable to a source you can check. What the table does give you is the structural reason cost per case sits where it does in each practice area, which is the part that transfers between firms. Use it to work out which lever your fee model actually hands you, then take the number itself from your own fee data, because that is the only place the answer exists.

What to do when the number comes back too high

There are four levers, and the order matters. The first two are cheap, fast and measurable inside a month. The last two cost money or time, and neither will help while the first two are broken.

Some of what shows up as a high cost per case is not a marketing problem at all. A firm that takes three days to return a call, or that cannot say which signed matter came from where, will produce a number that is arithmetically correct and practically useless. Fix the recording first: cost per case is only as good as the moment a signed case gets written down against a source, and unless someone owns that step it does not happen on its own.

Tighten the qualification gate before touching bids. One eligibility question on the form removes inquiries that were never going to sign, which cuts screening cost immediately and shows up in the numerator next month.
Measure time to first human contact for a week before changing anything. It costs nothing, and where an inquiry has gone to several firms at once, response time is the part of that decision you actually control.
Move budget between channels only after the first two, because a cost per case inflated by a slow intake desk follows the money wherever you move it.
Where the practice area allows it, shift weight from rented traffic to earned traffic. Organic and referral cost is front-loaded rather than charged per click, so cost per case falls as the asset ages, while paid holds roughly flat for as long as you keep paying.

How fee structure sets the cost-per-case ceiling in each practice area. Structural reasoning, not measured figures: we publish no dollar benchmarks here because we have not measured any.

Practice area	Where cost per case tends to sit, relative to other practice areas	What sets the fee ceiling	What moves a firm within that band
Personal injury	Highest in legal, and by far the widest spread, because one signed matter can be worth many times another	Contingency share of a case value that is not knowable at intake	Case selection. One qualifying criterion on the intake form moves this further than any bid adjustment.
Family	Middle, and narrower than personal injury, because the fee is knowable early	Hourly or flat fee, billed across months	Whether the firm counts a paid consult as a case. Two firms drawing that line differently cannot compare their numbers at all.
Immigration	Among the lowest in legal, with screening rather than media as the dominant cost	Flat fee per filing, often several filings per client	Language coverage and volume. The cost that decides the number here is screening time rather than the advertising invoice, so the line that gets omitted is the line that mattered.
Criminal defense	Low to middle, but concentrated into the hours when inquiries actually arrive	Flat fee per charge class, collected up front	Speed of response. Inquiries arrive at night and on weekends, and the first firm to reach the caller usually signs.
Employment	Middle to high, because inbound is tested for merits before a consult ever happens	Contingency or mixed fee after a long qualification step	How much screening happens before the consult. Inbound that fails the merits test still consumes screening time, so this is a screening cost before it is a media cost.

Common questions

What is a good cost per case for a law firm?: There is no reliable cross-industry answer, and any single figure offered as one is an average across firms with different fee structures, markets and capacity. The usable test is internal: cost per case against average fee earned per matter. Decide what share of gross fee you are willing to spend on acquisition, then judge every channel against that ceiling instead of against another firm's number.
Is cost per case the same as cost per acquisition?: In legal marketing they are usually used interchangeably, but cost per acquisition (CPA) comes from ecommerce, where the acquisition is a completed purchase. The equivalent event in a law firm is a signed fee agreement, not a lead and not a consultation. If a vendor reports CPA, ask which event they are counting before you compare it to anything.
How do I calculate cost per case when clients take months to sign?: Hold the cohort rather than the calendar. Attribute a month's spend to the cases that eventually sign from leads generated in that month, and report the figure as provisional until the practice area's usual signing window has passed. A rolling twelve-month window is the alternative: it hides the lag rather than handling it, but it is defensible as long as you state which method produced the number.
Should cost per case include intake staff time?: Yes, and it is the easiest line to leave off, because no invoice ever names it. Intake labor is what separates a cheap channel from a good one. A channel producing four times the inquiries for the same number of signings consumes roughly four times the screening time, and none of that appears on an advertising invoice. Use a loaded hourly rate and an honest estimate of hours rather than leaving the line at zero.
How do I track cost per case by channel without buying new software?: Add one required source field to the intake record, populate it at first contact rather than at signing, and reconcile it monthly against analytics and call records. Self-reported source is unreliable, so treat it as an approximation rather than a record. A rough number maintained every month is worth more than an exact number nobody ever computes.

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