Average Cost Per Signed Case: How to Calculate Yours

Key Takeaways

• What does average cost per signed case mean?
• Why is there no reliable industry average?
• How do you calculate cost per signed case?
• How do you model a realistic average cost per signed case?

There is no audited, industry-wide average cost per signed case for law firms. The figures in circulation are estimates from agencies, ad platforms and practitioners, so the average worth managing to is your own: acquisition spend divided by the signed retainers that spend produced, measured by channel and practice area.

Key takeaways

• Cost per signed case equals acquisition spend divided by signed retainers from that spend.
• No audited industry average exists, so treat published figures as estimates.
• Divide cost per lead by your lead-to-signed rate to model cost per case.
• Track phone calls to their source, or channel-level numbers will mislead you.
• Calculate it by channel and practice area, never as one blended number.

Picture two personal injury firms that each spend $20,000 a month on Google Ads. One signs eight cases from that spend; the other signs three. Their cost per lead could be identical, yet the first pays $2,500 per signed case and the second pays about $6,700. Almost all of that difference happens after the click: how fast intake answers, which matters the firm accepts, and whether anyone connects phone calls to the ads that produced them.

This guide explains what the published figures actually measure, how to calculate your own number, a simple model you can run before your tracking is perfect, and the levers that move the result.

What does average cost per signed case mean?

Cost per signed case is the marketing money it takes to produce one signed fee agreement. It is the legal version of what ad platforms call cost per acquisition, with one difference that matters: in legal marketing, the acquisition is a retained client, not a form fill. Your average cost per signed case for any period is the spend for that period divided by the cases it produced.

If your firm spent $30,000 on acquisition in a quarter and 12 signed cases trace back to that spend, your average cost per signed case for the quarter was $2,500.

Lead, consultation, signed case: where the money goes

A lead is any inquiry: a form, a call, a chat. A consultation is the conversation where your intake team or an attorney evaluates the matter. A signed case is the only one of the three that produces a fee.

Each step has its own conversion rate, and the rates multiply. If 40% of your leads book a consultation and half of those consultations sign, you sign one case for every five leads, so each signed case costs five times your cost per lead. Improve either rate and the cost per case falls without any change to your ad budget.

Cost per signed case vs. cost per lead vs. client acquisition cost

Three metrics get used interchangeably, and they shouldn't be:

• Cost per lead (CPL) is what you paid for an inquiry, whatever its quality.
• Cost per signed case is what you paid for a retained client. It equals your CPL divided by your lead-to-signed rate.
• Client acquisition cost (CAC) usually means the fully loaded version: marketing plus the intake staff time, software and fees it takes to sign a client.

A falling CPL can hide a rising cost per signed case. Broaden your targeting and lead costs drop, but if the extra leads rarely retain, every signed case gets more expensive. That is why the cost per lead for law firms is a useful input and a poor target.

Why is there no reliable industry average?

Search for the average cost per signed case and you will find confident numbers. Before you build a budget around one, check what it measures. No independent body publishes audited signed-case data for law firms, and firms rarely publish their own. What exists is a mix of ad-platform benchmarks, agency estimates and forum anecdotes, each built on its own definitions.

What the published figures actually measure

Two widely read sources show the problem.

LocaliQ's search advertising benchmarks, last updated in June 2026 and drawn from thousands of its customers' Google Ads and Microsoft Ads campaigns, put the average cost per lead for attorneys and legal services at $131.63, about twice the all-industry average of $66.69. LocaliQ counts any contact that follows a click as a lead, by phone, chat, form or email. The figure covers every practice area, and it stops at the lead.

An article in The National Law Review from January 2025 looks only at personal injury pay-per-click. It estimates $700 to $1,500 per lead and puts the cost of acquiring a signed case at roughly $2,500 to $3,000. Its 300-case scenario, though, assumes ten leads for every signed case. At that ratio, its own cost-per-lead range implies $7,000 to $15,000 per signed case.

The two sources differ on cost per lead by a factor of five to eleven, because they measure different things. The second also shows how completely a cost-per-case figure depends on the conversion assumption underneath it. Published numbers are a starting point for questions, not a standard to manage against.

Five questions to ask before you trust a benchmark

Before you compare your average cost per signed case with anyone else's, find out:

1. What counts as spend? Media only, or agency fees, lead vendors and software as well?
2. What counts as signed? A signed fee agreement, an accepted case, or a booked consultation?
3. Which channels? Paid search, Local Services Ads, social and referrals all behave differently.
4. Which practice area and market? A national mass tort campaign and a small-city family law practice share almost nothing.
5. Over what window? Some matters sign the same day and others take weeks, so a one-month snapshot can badly misstate the result.

If a figure can't answer those five questions, treat it as a conversation starter rather than a target.

How do you calculate cost per signed case?

The formula fits on one line. The work is in feeding it clean inputs and applying the same definitions every month.

The core formula

Cost per signed case = acquisition spend ÷ signed cases produced by that spend

Say your firm spent $18,000 on search ads, Local Services Ads and an SEO retainer in a quarter, and nine signed cases trace back to that spend. Your average cost per signed case for the quarter is $2,000. Run the same division for each channel and you get the numbers that should drive budget decisions. The cost-per-signed-case calculator runs this math in about a minute.

What to count as spend and as a signed case

Decide your definitions once and keep them. Most firms need two versions of the number:

• Media cost per signed case uses ad spend only: Google Ads, Local Services Ads, social, directories and paid lead vendors. It is the right figure for comparing one channel with another.
• Fully loaded cost per signed case adds agency and SEO fees, call tracking and intake software, and the share of intake staff time spent on new inquiries. It is the right figure to hold against case value.

For the denominator, count a case once, on the date the client signs the fee agreement. Leave out matters you declined or referred out, and decide in advance how to treat referral-fee cases and returning clients, since neither came from this period's marketing. If your case management system records the originating lead source on every matter, this is a report. If it doesn't, closing that signed case attribution gap comes before any optimization.

Matching spend to cases across the signing lag

Calendar-month math breaks when cases sign late. A lead who clicks an ad in March and signs in May flatters May's results and makes March look worse than it was. The fix is cohort reporting: group signed cases by the month the lead first came in, then divide each month's spend by the cases that month's leads eventually produced.

Expect recent months to look expensive until their late signers arrive. Judge channels on cohorts that are at least 60 to 90 days old, and never cut a channel on the evidence of its newest month.

How do you model a realistic average cost per signed case?

If you can't yet measure signed cases by channel, you can still estimate a realistic figure from two numbers most firms already have.

The two-number model

Cost per signed case = cost per lead ÷ lead-to-signed rate

Your cost per lead comes from your ad platforms and call tracking. Your lead-to-signed rate comes from intake: of the inquiries a channel produced, what share became signed clients? Write the rate as a decimal, so 12% becomes 0.12.

Take LocaliQ's legal average of $131.63 per lead as a first input. If one lead in ten signs, the model gives about $1,316 per signed case in search media alone. If one in twenty signs, it doubles to about $2,633. Swap in $700 per lead, the low end of the National Law Review's personal injury range, and a 10% signing rate gives $7,000.

None of those outputs is a benchmark. Each is arithmetic on a stated assumption, and that is what makes the model useful: replace the assumptions with your firm's numbers and the output is yours.

How cost per lead and signing rate combine

The figures below show how cost per lead and signing rate combine. They are arithmetic, not market data.

• $150 per lead: $3,000 if 5% of leads sign, $1,500 at 10%, $750 at 20%.
• $300 per lead: $6,000 if 5% of leads sign, $3,000 at 10%, $1,500 at 20%.
• $600 per lead: $12,000 if 5% of leads sign, $6,000 at 10%, $3,000 at 20%.
• $1,200 per lead: $24,000 if 5% of leads sign, $12,000 at 10%, $6,000 at 20%.

Compare the rows and the lesson is plain. A firm paying $600 per lead that signs 20% of its leads pays the same per case as a firm paying $150 per lead that signs 5%. Doubling your signing rate does as much as halving your cost per lead, and the signing rate is the lever your own team controls most directly.

What drives cost per signed case up or down?

Every movement in the number traces back to one of two inputs: what you pay per lead, or how many leads it takes to sign a case.

Auction pressure and targeting

Search ads are sold at auction, so your cost per click rises when competitors enter your market or raise their budgets, even when nothing changes on your side. Legal is one of the more expensive categories: LocaliQ's 2026 data puts the average legal cost per click at $9.87, against $5.42 across all industries, and the National Law Review article estimates $70 to $250 per click for personal injury, depending on the market. When clicks get dearer and your conversion rates hold still, cost per signed case rises in step.

Targeting decides what those clicks buy. Broad keywords and wide geographic settings bring in matters you don't handle, callers outside your jurisdiction and job seekers. Practice-specific keywords, negative keyword lists and a weekly review of search terms raise the share of leads that can become cases. Your cost per lead may rise while your cost per signed case falls.

Intake speed and case acceptance

Speed matters because a prospect who reaches your voicemail can call the next firm on the page. In the Lead Response Management Study, leads reached within five minutes were far more likely to qualify than leads first contacted at thirty minutes. Qualifying is not signing, but a lead your team never reaches never signs. Live call answering, form responses within minutes and more than one follow-up attempt all raise your signing rate without buying a single extra click.

Which matters you accept moves the denominator directly. A firm that declines low-value matters signs fewer of the leads it pays for, so its cost per signed case rises even as its average fee per case improves. That trade can be worth making, which is why cost per signed case belongs next to average fee per case, never on its own.

Unattributed phone calls

For many firms the phone is the main intake channel, and calls are the leads most often lost to attribution. If a caller who found you through a paid ad isn't tied back to that ad, the case lands under "direct" or "unknown," and the ad looks more expensive than it really was. Per-campaign tracking numbers, with recordings and outcomes, are what connect a phone call to a signed retainer. Here is how law firm call tracking software closes that gap.

How do you lower cost per signed case?

There are two levers: pay less for each lead, or sign more of the leads you already pay for. Most firms work only the first.

Fix intake before buying more leads

An improvement in intake applies to every lead you already buy. Track time to first response, contact rate and consultation-to-signed rate every week. An automatic text after a missed call, a form reply within minutes and a structured intake script each lift the signing rate. The most common law firm intake process mistakes make a practical checklist to start from, and conversion rate optimization for law firms covers the same ground on your forms and landing pages.

Bid toward signed cases, not form fills

Automated bidding optimizes toward whatever you report as a conversion. Report form fills and calls and it finds more form fills and calls, including the ones that never sign. Offline conversion imports let you send signed contracts back to the Google Ads click that started them, so bidding learns what a signed case looks like. It starts with clean Google Ads conversion tracking. If you would rather have it set up for you, offline-conversion import is part of managed law firm PPC.

Reallocate budget on channel-level results

Once you can see cost per signed case by channel and campaign, move budget toward what signs and away from what only generates inquiries. Review monthly, judge on cohorts old enough to have signed, and don't cut a channel on one poor month from a small sample. The law firm marketing ROI guide shows how to set these numbers against case value, and planning your marketing around cost per signed case turns them into a budget.

This is the problem the GavelGrow platform is built around. It connects the ad click, the tracked call and the signed retainer, so cost per signed case is reported per campaign rather than pieced together from three tools. Plans start at $199 a month, with a 7-day free trial and no credit card required.

Frequently Asked Questions

What is a good average cost per signed case for a personal injury firm?

A good number is one your case values can carry, not one borrowed from another firm. Divide your cost per signed case by your average fee per signed case to see what share of revenue acquisition consumes. If your average fee on a motor vehicle case is $10,000 and you pay $3,000 to sign one, acquisition takes 30% of the fee before case costs and staff time. Published personal injury estimates, such as the $2,500 to $3,000 in the National Law Review, are a rough sense check at best, because their definitions rarely match yours.

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

Group signed cases by the month the lead first came in, not the month the fee agreement was signed. Then divide each month's spend by the cases that month's leads eventually produced. Recent months will look expensive until their late signers arrive, so judge a channel on cohorts at least 60 to 90 days old. Cohorts are what make it fair to compare a channel that signs cases within a week with one whose cases take a full quarter to close.

Should intake staff salaries count toward cost per signed case?

Count them in one version and not the other. Media cost per signed case uses ad spend only and is the right figure for comparing channels. Fully loaded cost per signed case adds agency and SEO fees, software, and the share of intake salaries spent on new inquiries, and it is the right figure for judging profitability against case value. Report both every month, so a channel that looks cheap on media alone can't hide the staff time it consumes.

Is cost per signed case the same as cost per acquisition in Google Ads?

Only if you import signed cases. Google Ads reports cost per conversion for whatever you define as a conversion, which for most law firms is a form submission or a phone call. That makes the "Cost / conv." column a cost per lead. To see a true cost per signed case inside Google Ads, you need to import signed contracts as offline conversions, matched to the click that produced them, which Google supports through its offline conversion imports feature.

How many signed cases do I need before the number is reliable?

More than most firms get in a month from a single channel. If a campaign signs four cases a month, one extra or missing case moves its average cost per signed case by between 20% and 33%. Use a rolling 90-day window or quarterly cohorts before you cut or scale a channel, and look for the same direction across several periods rather than reacting to one month. Small samples punish impatience more than any other measurement mistake.

Can I compare my average cost per signed case with other firms?

Only when the definitions match. Ask what spend was included, what counted as signed, which channels and practice areas were measured, and over what window. Two firms can report the same figure while measuring completely different things. The most dependable comparison is your own number over time: the same definition, measured the same way every month, broken out by channel and practice area. That trend tells you more than any single outside figure.

Frequently Asked Questions