2026 PI PPC Guide · Updated May 2026
How Do I Measure the Success of a PPC Campaign for Personal Injury Law Firms?
To measure the success of a PPC campaign for personal injury law firms, track seven metrics in order of importance: cost per signed retainer is the only metric that aligns directly with your firm's docket economics, with signed-case ROAS, intake-to-retainer conversion, and speed-to-lead as the supporting indicators. Cost per click and cost per lead are leading indicators only — useful for tactical decisions but never sufficient to measure campaign success.
Quick answer
Measure personal injury PPC campaign success with seven metrics in order of importance: (1) Cost per signed retainer (CPSR) — the metric that pays your firm, $1,500–$8,000 for general PI; (2) Signed-case ROAS — target 5:1 minimum, 8:1 healthy; (3) Intake-to-retainer conversion (18–35%); (4) Speed-to-lead (sub-60-seconds); (5) Cost per qualified lead ($80–$400); (6) Cost per click ($50–$300+); (7) 30-day attribution window. Report weekly on CPSR, not monthly on lead counts.
Why this measurement hierarchy — and what to ignore
Most personal injury PPC reports lead with click-through rate, cost per click, and lead volume. All three are vanity metrics for PI firms. They tell you whether ads are running, not whether the campaign is producing signed cases. The seven metrics on this page are ordered by their alignment with docket economics — and that order matters because PPC operators frequently chase upstream metrics in ways that hurt downstream signed-case results.
What to ignore:impressions, raw click counts, click-through rate at the campaign level, quality score, and any metric that doesn't connect to a signed retainer. Useful for tactical diagnosis (a sudden CTR drop on one ad might flag creative fatigue), useless as success measures.
Reporting cadence:CPSR and ROAS reported weekly to firm leadership; intake-to-retainer conversion and speed-to-lead reviewed daily by intake operations; CPL, CPC, and attribution windows reviewed weekly by the PPC team. Monthly reporting is too slow — a campaign losing money for 30 days before anyone notices destroys budget that can't be recovered.
See the complete Personal Injury PPC 2026 guide for the keyword categories and execution strategies these metrics measure.
Measurement framework
The 7 metrics for measuring personal injury PPC campaign success
Listed in order of importance. Cost per signed retainer is the only metric that aligns directly with docket economics — everything else is a leading indicator.
Cost per click (CPC)
$50 – $300+ for high-intent PI keywordsPI has some of the highest CPCs in all of paid search. CPC is a leading indicator only — useful for budget pacing and creative-rotation decisions, but not a success metric. A $300 CPC that produces a signed case at $1,800 cost-per-signed-retainer is excellent; a $40 CPC that produces zero signed cases is failure.
Cost per lead (CPL)
$80 – $400 per qualified PI leadCost per qualified lead (claimant who completes the intake call and meets case criteria). Better than CPC but still leading. PI firms that optimize on CPL alone tend to accept low-quality leads that don't sign — and burn intake-team capacity in the process.
Cost per signed retainer (CPSR)
$1,500 – $8,000 for general PI · $1,800 – $15,000 for mass tortThe metric that pays your firm. Tracks all-in marketing cost divided by the count of clients who signed a retainer agreement. CPSR is the only PPC success metric that aligns directly with docket economics — every other metric is upstream of it. Report weekly, not monthly.
Signed-case return on ad spend (ROAS)
5:1 minimum, 8:1 target for healthy PI economicsAverage expected fee per signed case divided by CPSR. A firm with $30,000 average expected fee and $4,500 CPSR runs 6.7:1 ROAS — healthy. Below 4:1 is a warning sign; below 3:1 is unsustainable.
Intake-to-retainer conversion rate
18% – 35% for trained PI intake teamsOf claimants who reach intake, what percentage sign a retainer agreement. Below 18% indicates intake training or lead-quality issues; above 35% suggests lead criteria may be too restrictive and you're leaving volume on the table. Calibrate by case-type minimum thresholds.
Speed-to-lead response time
Sub-60-second answer rate for inbound callsTime from form submission or call to first human contact. Conversion to retainer drops ~7% per minute of delay in the first 10 minutes. Sub-60-second response is the single strongest predictor of PI PPC conversion — more impactful than any keyword or creative optimization.
Attribution window and lookback
30-day click, 1-day view, multi-touch creditPI claimants frequently research for days or weeks after the first ad impression before contacting a firm. A 7-day attribution window will under-credit PPC by 30–50%. Configure GA4 + your CRM with 30-day click attribution and multi-touch credit so PPC investments show their true contribution.
Related questions PI attorneys ask about PPC
Other PPC questions answered in our 2026 guide
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