A firm's marketing team reports that Google Ads produced 80 leads last month at $300 each. The intake team reports a 12% conversion rate on those leads. At that rate, the firm signed 9 or 10 cases from Google at a true cost of roughly $2,400 per new case.
Meanwhile, the television campaign produced 180 calls at $95 each. But television leads converted at 22%, delivering 39 signed cases at a true cost of $438 per new case.
Most firms look only at the first column: cost per lead. The intake conversion rate, handle time, and resulting cost per new case are often tracked in a separate system, or not tracked at all by source. That separation produces systematically bad budget decisions.
This article breaks down how different acquisition channels perform in PI intake, what drives the differences, and how to build a reporting structure that gives you the full picture on each source.
Why Lead Source Affects Intake Conversion
The caller's mindset when they dial is shaped by how they found the firm. A person who got your number from their neighbor who used your firm and won is not in the same state as someone who clicked a search ad while looking for their accident report. Both are potential clients. They will behave differently in the intake call.
Four variables drive conversion rate variation across sources:
1. Decision Stage
Referral callers have already made a social commitment to pursue the case: they reached out because someone they trust told them to. Search callers are often still deciding whether to pursue anything at all. Television callers fall somewhere between the two. The earlier the caller is in their decision process, the more work the intake agent has to do, and the more likely the call ends without a commitment.
2. Intent Quality Within the Channel
Not all search traffic is equivalent. A caller who searched "Texas car accident attorney referral" has higher intent than one who searched "Texas accident report." Accident report campaigns capture many callers who want a document, not a lawyer. Broad awareness campaigns (billboard, TV) capture people who are injured and thinking about their options. This is a genuine pipeline, but it requires more intake skill to convert than warm referrals.
3. Contact Rate and Speed-to-Lead
Digital leads submitted via web form are not inbound calls. The contact rate on form submissions depends almost entirely on how fast the firm reaches back out. Research across PI intake operations consistently shows that contact rate drops by more than half when outbound follow-up is delayed beyond five minutes. High-volume digital lead programs that lack the infrastructure to execute sub-five-minute follow-up are systematically wasting acquisition spend.
4. Case Type Match
Television campaigns targeting a metro area will generate a mix of case types, many of which may fall outside a firm's focus. Google campaigns can be tightly targeted by keyword to attract only the case types a firm handles well. A general injury attorney running television will have a higher screen-out rate at intake than a firm that uses targeted digital to stay in its case type lane.
Benchmarks by Lead Source
The ranges below reflect aggregate performance across PI intake operations. Individual firm results vary based on intake quality, case type restrictions, geography, and call handling speed. Use these as calibration points, not targets.
| Lead Source | Typical Contact Rate | Intake-to-Sign Rate | Avg Handle Time |
|---|---|---|---|
| Attorney referral | 95%+ | 60–80% | 12–18 min |
| Client referral | 90%+ | 50–70% | 15–22 min |
| Television (inbound) | 85–95% | 20–35% | 18–28 min |
| Google Ads (phone call) | 99% (inbound) | 12–18% | 8–14 min |
| Google Ads (form fill) | 35–55% | 5–10% | 10–16 min |
| Organic / direct website | 80–95% | 25–45% | 14–20 min |
| Lead aggregator (shared) | 20–40% | 2–5% | 6–10 min |
Reading the table: Handle time reflects a quality signal as much as an efficiency metric. Referral and television leads have longer handle times because the cases are more substantive and the callers are more engaged. Short handle times on lead aggregator contacts often reflect quick disqualification. When tracking handle time by source, always pair it with conversion rate: high handle time with low conversion signals intake inefficiency; low handle time with high conversion signals strong caller quality.
Calculating True Cost Per New Case by Source
Cost per lead is the metric most acquisition vendors report because it makes their product look best. Cost per new case is the metric that actually drives law firm profitability. Here's how to build the full calculation for each source.
Step 1: Acquisition Cost Per Lead
Acquisition cost includes all spend to generate the lead: ad spend, agency fees, production costs (television), referral fees, directory fees. Divide by total leads generated to get cost per lead.
Step 2: Contact Cost
Not every lead becomes a contact. For each lead that reaches an intake agent, add a per-contact cost: intake agent hourly rate multiplied by average handle time for that source, plus overhead allocation. For TV inbound calls at an average of 22 minutes, this is meaningful. For lead aggregator contacts at an average of 8 minutes, it is much smaller.
Step 3: Conversion Rate to Signed
Signed retainers divided by leads generated (not contacts) gives you an end-to-end conversion rate that accounts for both contact failure and intake conversion failure.
Step 4: Total CPNC
Add acquisition cost and intake operating cost per lead. Divide by the contact-to-sign rate. The result is total cost per new case for that source.
| Source | CPL | Sign Rate | True CPNC |
|---|---|---|---|
| Television | $95 | 22% | $432 |
| Google Ads (phone) | $300 | 12% | $2,500 |
| Google Ads (form) | $180 | 6% | $3,000 |
| Lead aggregator | $40 | 3% | $1,333 |
In this example, television has the lowest true CPNC despite a higher cost per lead than aggregators. Google Ads phone leads are far more expensive per case than they appear from CPL alone. The aggregator, despite a very low CPL, produces cases at $1,333 each because the contact and sign rates are extremely low.
These numbers will differ by firm, market, and case type mix. The point is that lead cost alone does not rank sources correctly.
Where Firms Lose Conversion by Source
Digital: The Speed-to-Lead Problem
For Google and Meta form submissions, the single largest driver of lost cases is delay between form submission and outbound contact. Research across hundreds of thousands of legal leads shows that contact rate at five-minute follow-up is roughly 40 to 50%. At 30 minutes, it drops to 20 to 25%. At 60 minutes, below 15%.
Firms that treat form submissions as next-business-day follow-up are operating at maybe 5% of what that lead flow could produce. This isn't an acquisition problem. It's an intake infrastructure problem.
Television: The Staffing Mismatch Problem
Television campaigns generate calls when they air. A spot that runs at 10pm on a Tuesday generates calls between 10:00 and 10:30pm. If the intake operation is staffed 9am to 6pm, those calls hit a voicemail. Contact rates for evening television leads that hit voicemail and require a morning callback are 30 to 40% lower than live-answer inbound rates.
24/7 intake staffing is the most direct solution. A callback cadence that reaches out within 30 minutes during business hours is the minimum standard for preserving the conversion potential of TV spend.
Referrals: The Follow-Through Problem
Referral leads have the highest natural conversion potential, and they also carry the highest cost of failure. A client who was referred by their friend and got sent to voicemail, called back three days later, and handled by an agent who didn't acknowledge the referral context is a missed case and a damaged relationship.
Referral leads should be flagged in the intake CRM as referred, routed to the most experienced available agent, and prioritized in the callback queue. The conversion potential is too high to treat referrals as undifferentiated inbound volume.
Building a Lead Source Dashboard
The data required to track intake performance by source exists in most firms. It is rarely connected.
A functional lead source dashboard requires four pieces: acquisition data (spend and lead count by source, typically from the ad platform or media buy), intake data (handle time and disposition by lead, typically from the intake CRM or call tracking platform), retainer data (signed cases and dates, from the case management system), and a bridge field that links each retainer back to a source-identified lead. That bridge is the part that breaks most often. Leads are entered into the intake system without a source tag, or source tags are inconsistent across channels, or retainer records in the case management system don't retain the original source.
Fixing the bridge usually requires three decisions: standardize source tag values across all intake channels and enforce them in the CRM intake form; add a mandatory source field to the retainer record in the case management system; and define a clear attribution rule for multi-touch scenarios (most firms credit the first-touch source or the most recent touch, and either is defensible as long as it is consistent).
Using Source Performance to Adjust Operations, Not Just Budgets
The obvious use of lead source conversion data is to shift budget from low-performing sources to high-performing ones. That's the right move, but it's the smaller lever.
The larger lever is adjusting intake operations per source.
If Google form leads convert at 5% and you know that the primary cause is delayed follow-up, adding a 24/7 follow-up process specifically for form leads may double or triple conversion without changing acquisition spend. If television leads have high conversion but long handle times, adding a second agent on call-heavy TV nights reduces abandonment without cutting the campaign.
Lead source conversion data answers a question most PI firms don't ask: not where should we spend more or less money, but how should we deploy our intake resources differently based on where each caller is coming from.
Practical starting point: If you have one CRM and one phone system but no unified lead source tracking, the fastest path to this data is tagging phone numbers by campaign. Each acquisition channel gets a unique tracking number that routes to the same intake line. Call data by tracking number gives you inbound volume, handle time, and disposition by source even before you connect it to retainer records.
Frequently Asked Questions
Which lead source typically converts best in PI intake? +
Attorney referrals and client referrals convert at the highest rates, often 60 to 80 percent of contacts to signed retainer. Television inbound calls convert at 20 to 35 percent. Google Ads phone calls convert at 12 to 18 percent. Form fill leads from digital sources convert at 5 to 10 percent when followed up within five minutes, and below 3 percent when follow-up is delayed. The conversion gap between referrals and digital reflects decision stage, not lead quality per se.
Why do digital leads convert at lower rates? +
Digital leads are earlier in the decision cycle than referrals, form submissions require outbound follow-up with dropping contact rates over time, and broad keyword targeting captures curiosity intent alongside high-intent traffic. The fix is two-part: tighter keyword targeting to raise the quality floor, and sub-five-minute follow-up infrastructure to recover contact rate on form fills.
How do I calculate true cost per new case by lead source? +
Add acquisition cost per lead to intake operating cost per lead (agent time and overhead per contact, multiplied by contact rate). Divide the total by end-to-end conversion rate from lead to signed retainer. This gives you CPNC that accounts for both acquisition efficiency and intake efficiency. Cost per lead alone understates total CPNC for sources with low contact or conversion rates.
What is a realistic intake conversion rate for Google Ads phone calls? +
For inbound phone calls from Google Ads PI campaigns, a realistic range is 12 to 18 percent conversion from contact to signed retainer. Firms targeting tighter, higher-intent keywords (case type plus geography) and using structured intake tend toward the upper end. Firms running broad match campaigns with general intake processes often fall at 8 to 12 percent. Twenty percent and above is achievable with keyword discipline combined with high-quality intake handling.
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