Definitive Guide
Cost Per Case for Personal Injury Firms
The Definitive Guide to the Metric That Matters Most
Cost per case is the dividing line between firms that grow predictably and firms that grow busily. It tells you exactly what you paid for a signed client — by source, by month, by vendor. Yet fewer than 30% of PI firms can calculate it accurately by lead source. This guide changes that.
The Core Metric
What Is Cost Per Case?
Cost per case (CPC) is the total marketing spend on a specific lead source divided by the number of signed cases that source produced during a given period. It answers one question: how much did it cost to acquire a retained client from this source?
The critical distinction is source-level versus firm-wide. A firm-wide average CPC hides the variance between sources. A firm spending $200,000 per month across eight vendors might have a blended CPC of $3,000 — but one vendor could be delivering cases at $1,200 while another is running at $7,500. The firm-wide number tells you nothing about where to allocate your next dollar.
Cost per case also differs fundamentally from cost per lead and cost per consultation. Cost per lead measures what you paid for an inquiry — a phone call, a form fill, an intake request. Cost per consultation measures what you paid for a qualified conversation. Neither tells you what you paid for a result.
The frame that matters
Cost per lead tells you what you paid for attention. Cost per case tells you what you paid for results. Every dollar you allocate should be measured against the second number, not the first.
The Math
How to Calculate Cost Per Case
Core Formula
CPC = Total Spend on Source (period) ÷ Signed Cases From Source (period)
Worked Example
$30,000 / month vendor spend ÷ 10 signed cases = $3,000 CPC
Calculate for each source individually. A firm-wide average masks the vendors you should scale and the ones you should cut.
The Time-Lag Problem
In e-commerce, you know if an ad was profitable within hours. In personal injury, settlements lag 6–18 months behind the lead. Even signed-case measurement has a delay — a lead that arrived in January might not sign until March. This delay means your CPC number is always looking backward, and you need to account for it when making forward budget decisions.
Calendar-Period Matching
Compare spend in a month to signed cases in the same month. Simple to calculate, but ignores the lag between lead arrival and case signing. Best for sources with short intake cycles (under 30 days).
Cohort-Based Attribution
Track leads that arrived in a specific month and follow them until they sign (or don't). More accurate, but requires patience — a cohort from January may not be fully resolved until April. Best for long-term vendor evaluation.
What You Need Before You Start
Spend Data
Monthly cost per source from ad platforms, vendor invoices, and agency statements
Lead & Case Data
Lead source, intake date, signed case date, and source attribution for every case
Attribution Data
A clear link between the original lead record and the signed case in your CMS
Industry Data
Cost Per Case Benchmarks by Firm Size and Lead Source
Benchmarks are reference points, not targets. Your optimal CPC depends on your case mix, market, and break-even economics. Use these to identify where you fall relative to peers — then set targets based on your own numbers.
Cost Per Case by Firm Revenue Tier
| Firm Revenue | Typical CPC Range | Context |
|---|---|---|
| Under $5M | $800 – $2,500 | Smaller caseloads, local markets, lower ad competition |
| $5M – $15M | $1,500 – $4,000 | Expanding into paid channels, mid-market competition |
| $15M – $40M | $2,500 – $6,000 | Multi-market presence, higher case values targeted |
| $40M+ | $3,500 – $8,000+ | National campaigns, premium case selection, brand spend |
Cost Per Case by Lead Source Type
| Lead Source | Typical CPC Range |
|---|---|
| Referrals & Organic | Under $500 |
| Google LSA | $1,500 – $5,000 |
| Pay-Per-Call | $1,000 – $4,000 |
| Exclusive Lead Vendors | $1,500 – $6,000 |
| SEO (Mature) | $1,500 – $4,000 |
| Google Paid Search | $2,000 – $8,000 |
| Shared Lead Aggregators | $2,000 – $7,000 |
| Social Media Ads | $3,000 – $10,000 |
What “best in class” looks like
Top-performing firms consistently run 25–40% below their peer group average CPC. They achieve this through rigorous source-level tracking, monthly vendor reviews, and fast reallocation of budget from underperformers to proven winners.
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Book a Free DemoThe Metric Trap
Why Cost Per Lead Is Not Enough
Vendor A
Vendor B
Vendor A looks better on a CPL report — $50 versus $200 per lead. But Vendor B produces signed cases at nearly half the cost. If you're optimizing for cost per lead, you'd scale Vendor A and cut Vendor B. That decision would cost your firm money every single month.
When CPL Still Has Value
- Early-stage testing— when launching a new source, CPL gives you a fast signal before signed-case data accumulates
- Volume monitoring— sudden CPL spikes may indicate market changes or campaign issues worth investigating immediately
- Anomaly detection— if CPL doubles overnight, something changed at the source level, even if CPC data won't show the impact for weeks
The bottom line
Cost per lead is an input metric. Cost per case is an output metric. Manage your budget on outputs, not inputs.
The Profitability Threshold
Break-Even Cost Per Case
Your break-even CPC is the maximum you can spend to acquire a case while remaining profitable. Every vendor decision should reference this number.
Three Components
Contingency Fee Revenue
Your average fee per settled case. For most PI firms, this ranges from $10,000 to $50,000+ depending on case mix and severity.
Case Operating Costs
Litigation costs, medical records, expert fees, and staff time per case. Typically $3,000 to $8,000 for standard PI matters.
Target Profit Margin
The margin you need after acquisition and operating costs. Most firms target 30–50% net margin per case.
Break-Even Formula
Break-Even CPC = Avg. Fee Revenue − Case Operating Costs − Target Profit
Example
$15,000 fee − $5,000 costs − $4,000 profit target = $6,000 break-even CPC
Any source consistently above $6,000 is losing money. Any source well below it is a candidate for more budget.
The Threshold Framework
Once you know your break-even CPC, categorize every source into one of three zones. Each zone triggers a specific action — not just awareness, but a decision.
Expand budget. This source is delivering profitable cases with margin to spare. Increase spend and monitor for diminishing returns.
Monitor and optimize. The source is profitable but tight. Review monthly, look for intake improvements or negotiation opportunities with the vendor.
Renegotiate or exit within 90 days. This source is losing you money on every case. Give the vendor 90 days to improve, with specific CPC targets. If they miss, reallocate the budget.
How this reframes budget conversations
When you present CPC relative to break-even, the conversation shifts from “how much are we spending?” to “what return are we generating?” Marketing spend stops being a cost center and starts being capital allocation— you're investing in sources with proven returns, not guessing where to put money.
Implementation Guide
How to Track Cost Per Case Step by Step
Whether you're building this from scratch in a spreadsheet or evaluating software, the process is the same. These five steps get you from zero to source-level CPC tracking.
Standardize Your Lead Source Taxonomy
Create a master list of every lead source with a single, consistent label. “Google Ads,” “Google PPC,” and “Google — Paid Search” should all map to one source. Inconsistent naming is the number one reason CPC data breaks down across firms.
Connect Spend Data to Source Records
Every lead source needs a monthly spend number attached to it. Pull from ad platforms, vendor invoices, and agency statements. If you can't tie a dollar to a source, you can't calculate CPC for that source.
Match Signed Cases Back to Lead Sources
When a case signs, trace it back to the original lead and its source. This requires a single record that follows the lead from first contact through intake to signed case. Without this connection, you know your spend but not your results.
Calculate and Record Monthly
Run the CPC calculation for every source at the end of each month. Monthly cadence catches trends early — quarterly reviews mean you could waste three months of budget before spotting a decline.
Set Source-Level Targets and Track Against Them
Define a CPC target for each source based on your break-even analysis and historical performance. Green, yellow, and red thresholds should trigger specific actions — not just awareness, but budget decisions.
Common Tracking Errors
Excluding agency fees from spend calculations
Include all costs: ad spend, agency management fees, vendor platform fees. Partial spend data produces artificially low CPC numbers that mask true acquisition costs.
Relying on single-month snapshots
One month of data is noisy. Use rolling 3-month averages to identify real trends. A vendor that had a bad month is different from a vendor in sustained decline.
Inconsistent source labels across months or team members
Enforce a single source taxonomy. When “Google Ads” becomes “Google PPC” in someone else's spreadsheet, your trend data breaks. Standardize once and lock it down.
Counting all leads instead of signed cases
CPC is about signed cases, not leads. A source that sends 100 leads but signs 2 has a very different CPC than a source that sends 30 leads and signs 10.
RevenueScale Does This Automatically
Spend data, case data, and attribution connected in a single view. No manual spreadsheets, no inconsistent labels, no missing records.
See How It WorksVendor Management
Using Cost Per Case for Vendor Decisions
Internal Comparison
Compare your best-performing source to your worst. The spread tells you how much budget is being misallocated. If your best source runs at $1,500 CPC and your worst at $6,000, every dollar shifted from worst to best produces four times the cases.
Trend Analysis
A vendor's CPC in any single month is noisy. The trend matters more. Rising CPC over three months signals a problem — declining lead quality, market saturation, or inventory issues. Stable CPC means the source is reliable. Falling CPC means it's improving and may warrant more budget.
When to Have a CPC Conversation With a Vendor
- CPC has risen 20%+ over three consecutive months— share the data and ask what changed on their side
- CPC exceeds your yellow-zone threshold— set a specific improvement target with a 60–90 day timeline
- CPC enters the red zone— present the numbers, give 90 days to reach yellow, and have a reallocation plan ready
When CPC alone isn't the right metric
A vendor with a $5,000 CPC that delivers cases settling at $300,000 average may outperform a vendor with a $2,000 CPC whose cases settle at $50,000. When case values vary significantly, cost per settlement dollaris the better comparison — it factors in both acquisition cost and case quality.
Channel Strategy
Cost Per Case by Channel: What Each Source Requires
Not all channels are created equal, and their CPC ranges reflect fundamentally different cost structures. The strategy for each channel is different too. Here's how to read CPC numbers for each major PI lead source.
Midpoint of typical range. Actual CPC varies by market, intake speed, and conversion rate. Referrals are near-zero cost and plotted at $350 to remain visible.
Channel-by-Channel Strategy Guide
Each channel has a unique cost driver and a specific lever for improvement. Understanding those levers turns CPC from a diagnostic into an action.
Google Local Service Ads (LSA)
$1,500 – $5,000 typical CPCYou pay per verified lead, not per click — which controls cost-per-lead but not conversion. The CPC lever here is your response time and your Google review score. Firms that respond within 5 minutes and maintain a 4.8+ rating consistently outperform peers by 25–35% on LSA CPC.
Watch for: CPC spikes often mean a drop in review score or slower response times — not a problem with the ad platform itself.
Pay-Per-Call
$1,000 – $4,000 typical CPCCost is predictable (flat rate per call) but quality varies wildly by network. The CPC lever is your call filter rules — duration minimums, geography, case type qualification. Weak filter rules let unqualified calls inflate your denominator without adding signed cases.
Watch for: If signed case rate from pay-per-call drops below 6%, audit your call recordings for quality issues before assuming the channel is declining.
TV / Broadcast
$4,000 – $12,000 typical CPCTV has the highest nominal CPC of any channel, but it also delivers branded cases with high average settlement values. The calculation is fundamentally different: you need to run CPC relative to average case revenue, not as an absolute number. A $9,000 CPC on cases settling at $120,000 on average beats a $2,500 CPC on cases settling at $22,000.
Watch for: The 6-to-18-month settlement lag is longest in TV cases. Track trailing 12-month cohorts, not the current month's signed cases.
Shared Lead Aggregators
$2,000 – $7,000 typical CPCAggregators sell the same lead to multiple firms, which means your conversion rate is partly determined by who calls first. The CPC lever is intake speed. Firms with sub-5-minute response times convert aggregator leads at 2–3x the rate of firms calling back within an hour. If your intake is slow, aggregator CPC will always be elevated.
Watch for: Aggregator CPC tends to compress over time as more PI firms enter the market. If you've been running the same source for 18+ months and CPC is creeping up, intake speed is likely part of the problem.
SEO / Organic
$1,500 – $4,000 typical CPCOrganic search has no direct per-click cost, but SEO spend (agency fees, content production, technical investment) must be included in your CPC calculation or the number is meaningless. A mature SEO program producing 10 cases per month with $25,000/month in agency fees produces a $2,500 CPC — competitive but not free.
Watch for: SEO cases tend to have the highest conversion rates of any paid or earned channel, often 15–25% from qualified inquiry to sign. That conversion rate is the asset to protect.
Referrals
Under $500 typical CPCReferrals have near-zero direct acquisition cost, but they're not free to produce. Attorney referrals require investment in relationships, reciprocation, and reputation. Track your relationship investment (meals, events, reciprocal referrals) as your referral “spend.” Even at a generous $5,000/month in relationship investment, 15 referral cases produces a CPC of $333 — better than any other channel.
Watch for: Many firms undercount referral cases because the lead source is logged as the intake channel (a phone call) rather than the referral source. Clean attribution requires asking “how did you hear about us?” at intake and logging it accurately.
Mass Tort
$5,000 – $15,000+ typical CPCMass tort has the highest CPC of any channel, but the economics work when case values are high (often $20,000–$100,000+). The lever is qualifying criteria strictness. Loose criteria increase case volume but inflate CPC as non-qualifying cases consume intake resources. Tighter criteria reduce volume but produce lower CPC on accepted cases.
Watch for: Mass tort CPC must always be evaluated against average projected settlement, not against general CPC benchmarks. Comparing mass tort CPC to Google Ads CPC is an apples-to-oranges comparison.
Channel Strategy Summary
Use this as a quick reference when evaluating each source in your monthly vendor review.
| Channel | Typical CPC | Key Lever | Scale When |
|---|---|---|---|
| Google LSA | $1,500–$5,000 | Response speed + review score | Below $3,500 for 3 months |
| Pay-Per-Call | $1,000–$4,000 | Call filter rules | Under $2,500 sustained |
| TV / Broadcast | $4,000–$12,000 | Market + daypart mix | Trailing 6-month CPC declining |
| Exclusive Vendors | $1,500–$6,000 | Lead exclusivity terms | Signed case rate above 8% |
| Aggregators | $2,000–$7,000 | Intake speed (call in <5 min) | Only if signed rate above 5% |
| Mass Tort | $5,000–$15,000 | Qualifying criteria strictness | Case value justifies CPC |
| Referrals / Organic | Under $500 | Relationship investment | Always — lowest CPC source |
Worked Example
How a $200K/Month Firm Calculates CPC Across 6 Vendors
Abstract benchmarks are helpful. A real calculation is better. Here's a complete month-by-month walkthrough for a mid-size PI firm running six active lead sources with a $200,000/month marketing budget.
Firm Profile
Monthly Marketing Budget
$200,000
Active Lead Sources
6 vendors
Break-Even CPC
$6,000
Break-even based on: $18,000 avg fee revenue − $6,000 case costs − $6,000 profit target = $6,000 break-even CPC
Monthly CPC by Vendor
| Vendor / Source | Monthly Spend | Leads | Signed Cases | CPC | Zone |
|---|---|---|---|---|---|
| Google LSA | $35,000 | 85 | 12 | $2,917 | Green |
| Pay-Per-Call (Vendor A) | $28,000 | 140 | 9 | $3,111 | Green |
| Exclusive Vendor B | $40,000 | 60 | 14 | $2,857 | Green |
| TV / Broadcast | $50,000 | 110 | 6 | $8,333 | Red |
| Aggregator C | $22,000 | 95 | 5 | $4,400 | Green |
| SEO / Organic | $25,000 | 45 | 10 | $2,500 | Green |
| Total / Blended | $200,000 | 535 | 56 | $3,571 | Blended |
What This Table Reveals
The blended $3,571 CPC is misleading
The firm's blended CPC looks healthy at $3,571 against a $6,000 break-even. But TV is running at $8,333 — 39% above break-even — and consuming $50,000 per month. That single source is costing the firm roughly $14,000 in excess acquisition spend every month relative to break-even.
SEO and the exclusive vendor are underinvested
SEO at $2,500 CPC and Exclusive Vendor B at $2,857 CPC are both running 53%+ below break-even. These sources are significantly underinvested relative to their unit economics. An additional $15K/month shifted from TV to each of these sources would produce an estimated 10–12 additional cases per month at favorable CPC.
Aggregator C needs a 90-day watch
Aggregator C at $4,400 CPC is in the yellow zone — profitable but only marginally. At 5 signed cases from 95 leads, the signed-case rate is 5.3%. If intake speed can be improved and that rate moves to 7%, CPC drops to $3,143 and moves firmly into green. Set a 90-day review with a target rate of 7%+ before deciding to scale or cut.
The broader point
This table is the conversation. When a managing partner asks “where is our marketing money going?,” you show this. When a vendor says their leads are performing well, you point to the CPC column. When you need to argue for more budget on a specific channel, you reference the green sources running 50%+ below break-even. Every major marketing decision becomes data-backed rather than instinct-backed.
How to calculate the true cost of a signed caseBudget Decisions
When to Increase vs. Decrease Vendor Budget
CPC data is only valuable if it triggers a decision. Use this framework to move from observation to action every time you review vendor numbers.
Scale Threshold
< 80% of break-even
Below $4,800 for a $6K break-even firm
Monitor Threshold
80–100% of break-even
$4,800 – $6,000 for a $6K break-even firm
Cut / Renegotiate Threshold
> 100% of break-even
Above $6,000 for a $6K break-even firm
Based on a $6,000 break-even CPC. Adjust thresholds proportionally for your firm's break-even number.
Four Budget Decision Scenarios
Each situation calls for a specific response. Here's the playbook.
Scenario
CPC is below 60% of break-even for 3+ consecutive months
Action: Increase budget aggressively — up to 40% more spend
A source running at 60% of break-even has significant headroom before economics change. Underinvesting here is a missed opportunity. Scale in 20% increments and monitor for diminishing returns. Most sources can absorb a 40% spend increase before CPC begins rising meaningfully.
Scenario
CPC is 80–100% of break-even and trending upward
Action: Hold budget flat — optimize conversion before adding spend
Adding budget to a yellow-zone source that's trending higher will accelerate the problem. Instead, address the conversion rate: improve intake response time, review lead quality with the vendor, and identify intake drop-off points. Only scale once CPC has stabilized or improved for two consecutive months.
Scenario
CPC crosses break-even for the first time
Action: Notify vendor, set 90-day improvement target
One month above break-even may be noise. Two consecutive months is a trend. When CPC first crosses your break-even threshold, present the data to your vendor with a specific target (e.g., back below $5,000 CPC within 90 days) and a consequence (budget reduction of 30–50% if the target is missed). Document the conversation.
Scenario
CPC has been above break-even for 3+ months with no improvement
Action: Reallocate 50–100% of budget to green-zone sources
A source that has run above break-even for a quarter with no sign of recovery is a permanent drain. The decision isn't whether to cut — it's how fast. Reallocate to your best-performing green sources first. If they can't absorb the budget increase, evaluate new source pilots. Never leave money sitting idle waiting for a troubled vendor to turn around.
Partner Reporting
Reporting Cost Per Case to Your Managing Partner
Your managing partner doesn't want a marketing dashboard. They want answers to four specific questions. Structure your report around them.
“How much did we spend?”
Total marketing spend for the period plus a per-source breakdown. No jargon, no impressions data. Dollars in, by source.
“What did we get?”
Signed cases per source and cost per case for each. This is the ROI answer — it connects every dollar spent to a specific result.
“Which vendors work?”
A green/yellow/red scorecard showing each source relative to your break-even CPC. Visual, immediate, no interpretation needed.
“More or less next quarter?”
A data-backed recommendation: expand budget on green sources, hold yellow, cut or renegotiate red. Specific dollar amounts, not percentages.
The One-Page Report Format
Put all four answers on a single page. Total spend at the top, source-level CPC table in the middle, green/yellow/red scorecard on the right, and your recommendation at the bottom. One page, no appendix, no follow-up questions needed. When your managing partner can read the entire marketing story in 60 seconds, budget conversations become about where to invest — not whether marketing works.
How CPC changes the budget conversation
“We need more budget” is a request. “We have three sources producing cases at $1,800 CPC against a $6,000 break-even — here's the return if we add $20K/month to each” is a business case. CPC gives you the data to make the second argument.
Frequently Asked Questions
What is a good cost per case for a PI firm?+
How is cost per case different from cost per lead?+
How do I calculate my firm’s cost per case?+
Why does CPC vary so much between lead sources?+
What is a break-even cost per case?+
Can I track cost per case without specialized software?+
How often should I review CPC by vendor?+
Why is CPC higher at larger firms?+
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