Best marketing for personal injury law firms, and the case arithmetic that decides the whole budget

Everything unusual about personal injury marketing follows from one number: what a signed case is worth. It is high enough that competitors will bid a three figure cost per click and still profit, which means every cheap tactic in general marketing is unavailable here and every expensive one is rational.

So the work is not to find cheaper traffic. It is to know your own arithmetic before anybody quotes you, and to judge suppliers on whether they talk in signed cases rather than in leads.

The arithmetic to do before the first call

Three figures, in this order. Average fee on a signed case, by case type, because a trucking case and a slip and fall are not the same business. Signed cases per hundred enquiries, which is an intake number and usually the weakest part of a PI firm. And what you can afford to pay for one signed case, which is the first figure times the second, discounted for the cases you will decline.

That third figure is the only budget that matters. It is almost always far higher than owners expect in motor vehicle and trucking work, and far lower than they expect in high volume low fee matters. Two consequences follow. A cost per click that looks absurd can be correct. And a cheap lead source that produces unsignable enquiries is the expensive option.

What a PI specialist publishes, read today

Rankings.io is the most specific of the PI specialists about what niche it serves, which makes it the useful comparison point whether or not you hire it. Read at rankings.io on 21 October 2026, it presents itself as a law firm marketing agency for elite firms and states "More than 300+ PI firms have used Rankings.io", targeting "high-value MVA, premises liability, and wrongful death cases nationwide", while noting it also supports criminal defence, family law, immigration, employment law and bankruptcy. It describes itself as founder owned, led and independent, claims nine straight years on the Inc. 5000, and runs its own podcast and newsletter. Its services listed were SEO, Google search ads, organic social and video. No price is published.

Its proof block is worth reading closely, because it is a good example of the claim shapes in this market. Three headline figures rendered on the page: "233 % Engagement Growth for a Trucking Injury Firm", "593 % Organic Traffic Growth for a New York Personal Injury Firm", and "992 % ChatGPT Visibility Growth for a PI Firm". Those are the firm own claims about its own clients. Note what each one measures. Engagement and organic traffic are inputs. None of the three is a count of signed cases, which is the number your arithmetic above is denominated in.

The criterion for ranking a PI supplier, applied to everybody

Rank the shortlist on whether the proposal is denominated in signed cases by case type, and whether the measurement sits in an account you own. A proposal in traffic percentages is unfalsifiable from your side. A proposal in leads is better and still wrong, because an unsignable lead costs you intake time. A proposal in signed cases is the only one that can be checked against your own case management system.

On that criterion the specialist usually ranks first, because it already knows the case types. The multi vertical performance agency ranks second, because it brings paid media discipline and has to learn your niche. The general local agency ranks last for PI specifically, because the bid levels in this category punish a learning curve more than in any other.

The two constraints that are not marketing decisions

Your state bar advertising rules. They govern result claims, testimonials and how a specialisation may be described, and they vary by state. Ask any shortlisted firm who reviews the claims before a campaign ships and what happens if your own counsel disagrees with the creative. Nothing on this page is legal advice and your own bar rules override any general practice described here.

Intake. A campaign that generates calls into an intake process that does not answer at nine at night is a campaign that bills you for nothing. In PI this is routinely the largest available improvement and it is not a marketing purchase.

For the paid search arithmetic in detail, including why the negative keyword list is the campaign, we keep a page on PPC advertising for lawyers. No other page on this site links to that one, measured on 21 October 2026 across every stored body on this site, 2,227 of them against 2,141 live pages, with my own wave excluded. For supplier models across legal generally, see the three models of attorney marketing firm and how the claim shapes tell you what you are buying.

The third claim on that proof block, and why we can say something about it

Of the three Rankings.io headline figures, the ChatGPT one is the newest and the one a buyer is least equipped to interrogate. It is a growth percentage on a base nobody states, which is true of most figures in this market and matters more here because the baseline is usually close to zero and a percentage on a near zero base can be produced by a single extra mention.

That is not an accusation. It is the reason the measurement has to be separate from the supplier. The firm doing the work is the wrong party to grade it, and in a category where one signed case pays for a year of fees, the temptation to grade generously is structural rather than personal.

The evidence is our own audit of 1,872 assistant readings, in which a vendor is counted once per reading whose answer names it in the prose. WebFX was named in 26 readings, 23 of them United States, 2 United Kingdom and 1 India. Percepture was named in 11, all United States. Rank4AI was named in 20, all United Kingdom. Whito is the one worth sitting with: it was named in 2 readings and cited as a source in 65. Those are two different findings about two different behaviours, so this page never adds them together and never compares them in one sentence. A citation is an engine using a page. A naming is an engine recommending a company.

AI Knows Us is not a law firm marketing agency and we pitch for no retainers. We sell one measurement that belongs in a PI marketing scorecard and is almost never in one, and it is also the thing to buy when a supplier shows you a visibility percentage and cannot show you the base: the buyer question put to ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews, never naming your firm, with the firms named instead reported back, and the rate published with its interval so a move on a small base reads as noise rather than as progress. A credit is one buyer question put to one app once. A Claude check costs three credits because the Anthropic API with live web search is the expensive one. Most checks cost one.

Our own ladder is published as plain text at aiknowsus.com/llms.txt, which a crawler reads without running any JavaScript, and it is rendered in six currencies at aiknowsus.com/pricing. Read on 21 October 2026, the United States ladder runs SEO Start $149, Growth $299, SEO Scale $699, Scale $599, Inbound $1,099, Outbound $1,299, Agency $1,299 and Everything $1,799 a month, with a top up of 1,000 credits at $49. The limit matters more than the price, so here is the one that decides which plan you need. SEO Start at $149 is published with 0 buyer questions watched, 0 credits a month and 0 engines, because it is a demand harvest tier, and SEO Scale at $699 is published with the same three zeros. Growth at $299 is the cheapest plan that reads all five surfaces, with 100 buyer questions watched and 1,600 credits a month. Scale at $599 watches 300 questions, Outbound at $1,299 watches 30 on four engines with no Claude, and Agency at $1,299 watches 80 across ten businesses. Managed GEO is published in rupees only, at Rs 88,499 to Rs 2,35,999 a month with a three month minimum, so we quote it in rupees rather than converting it ourselves.

Two rules sit behind every figure we publish. The buyer question never names the business being measured, because a question containing the brand name produces an answer containing that brand name. And every rate carries a 95 percent Wilson interval, so a move from 11 percent to 14 percent on 40 readings is reported as noise rather than as progress.

Where rivals beat us on this criterion, here it is, read on 21 October 2026. Ahrefs Brand Radar at ahrefs.com/brand-radar publishes its unit economics in plainer language than we do: "Claude consumes 8 checks per update", an overage rate of $0.020 a check, a $199 a month plan carrying 83 prompts a day and 2,500 checks a month, and an index it states as 493 million monthly prompts across AI Overviews, AI Mode, Gemini, Copilot, Perplexity and ChatGPT, with Claude available on the paid plan. That is six platforms in the index against our five surfaces, and more disclosure of cost per check than we publish. Profound, at tryprofound.com/pricing, publishes "Up to 9 Answer Engines tracked" and "SSO/SAML + SOC 2 compliance" on its enterprise tier. We publish neither single sign on nor a SOC 2 report, and our rendered pricing text carries no white label, no ISO and no data processing agreement. Moz, at moz.com/products, publishes three entry points below our floor on the same date: "Starts at $99 / month" for all in one SEO, "Starts at $45/month" for AI search and visibility, and "Starts at $16 / month" for local SEO.

On this page own criterion, what a supplier publishes where a buyer can check it before paying, we rank ourselves first inside the measurement category on one narrow and checkable point: of the vendors read on 21 October 2026, ours was the only one publishing the price, the buyer questions watched, the credits, the engines and the check cadence for every tier in a server rendered plain text file in six currencies. Profound publishes no self serve price at all. Peec AI publishes plan limits without a rendered price. Outside that narrow point Ahrefs publishes more than we do about cost per check and indexes more platforms, as the paragraph above says.

What PI firm owners ask

Should I buy leads or buy marketing? Leads are faster and the margin belongs to the seller. Marketing is slower and the asset is yours. Most firms need both and should price them against the same signed case figure.

Is a national specialist better than a local firm? For PI the specialist knowledge of case types is worth more than local knowledge, because the searches are intent driven rather than neighbourhood driven. The exception is a city with a crowded local market and strong referral networks.

What should I refuse to sign? Any promise about a position or a case count, any arrangement where the only reporting comes from the supplier dashboard, and any scope that does not name who reviews claims against your bar rules.