Ask how much should a law firm spend on marketing and what comes back is a percentage of revenue. Throw it out. Two firms on the same street billing the same $900,000 a year, one doing family law and one doing injury work, are buying clients whose prices differ by a factor of nine, and no share of revenue can absorb a gap that wide. Using the bands we publish, one signed matter costs about $400 in advertising in criminal defense and can pass $6,000 in personal injury.
Legal buys the most expensive clicks in advertising
WordStream’s 2026 benchmarks put attorneys and legal services at $131.63 per lead and $9.87 per click, the highest of any category they measure, across 13,474 US campaigns run between April 2025 and March 2026 1. In plain terms, ten people click your ad and you are out roughly $99 before a single one of them has typed their name into a form.
That $131.63 is the number every legal marketing guide quotes, and it is the one number a managing partner should never budget against. It blends a speeding ticket with a wrongful death claim. The same average covers firms bidding on a client worth $1,200 and firms bidding on a client worth six figures, and both of them are inside the sample.
The useful version of the question is narrower. What does one signed matter in your practice area cost to win, and can the fee on that matter carry it? Everything else is guessing with a percentage sign attached.
Work backwards from one signed matter
Take family law, where our published band puts a lead between $70 and $180 with a median of $110, and 15% of those leads typically become clients. Divide the median by the close rate and a signed client costs about $733 in advertising. At the top of the band, where competitive metro markets sit, the same client costs $1,200.
Now put a fee next to it. Assume your average family matter bills $2,500, which is a placeholder for whatever your own books say. At $733 you are giving up under a third of the fee to win the work, which is a business. At $1,200 you are handing nearly half of it to Google before a paralegal opens the file, and the remaining half has to cover the lawyer, the staff, and the rent. That second version is what an unlucky market looks like, and plenty of firms are in it without knowing, because nobody ever divided the ad spend by the signed matters.
Once you have that per-matter cost, the budget writes itself. Want six new family matters a month at the median, and the media budget is roughly $4,400 plus management. Want twelve, and it is $8,800, at which point the constraint stops being money and becomes whether anyone in the building has room to take the work. You can run your own version of this in our family law lead cost calculator, including the version where the answer comes back unaffordable.
Personal injury is a cash decision before it is a media decision
The injury numbers are a different species. Our published band runs $250 to $750 per lead with a median of $450, against a 12% typical close rate, which puts a signed case at roughly $3,750 in advertising at the median and $6,250 at the top of the band. Ten signed cases, a modest year for a small firm, is $37,500 of ad spend at the median. The fees on those cases arrive when the cases resolve, which is often a year or two later.
If losing $37,500 over a quarter would change how you run the firm, do not buy personal injury clicks, ours or anyone else’s. The waiting is what breaks small firms, even when the advertising performs exactly as designed, because the firms outbidding you are funding today’s clicks with settlements they signed in 2024. You are not competing against their marketing skill. You are competing against their cash flow.
What a small firm should buy instead is narrower and cheaper. Pick the single case type you handle better than anyone in your county, build one page for it, and buy only the searches that name it. A page about rear-end collisions on a specific interstate corridor costs a fraction of what “personal injury lawyer” costs, and it competes on relevance rather than budget. Put the rest of the money into the intake desk, because the leads you already pay for convert at wildly different rates depending on who picks up the phone. If you want to see the ceiling before you commit, the personal injury lead cost calculator will tell you what your case values can support.
Criminal defense has the friendliest math and a hard ceiling
Criminal defense wins on price. Our band runs $60 to $170 per lead with a median of $100, and a 25% typical close rate, which puts a signed matter near $400 in advertising, roughly a ninth of the injury number. Add that most defense work is paid up front rather than years later, and the cash cycle is friendlier too.
The ceiling is the problem. Defense demand is created by arrests in your county, and no budget increase creates more of them. Once your ads appear on most of the searches that exist, the extra money has to go somewhere, and where it goes is broader searches: people three counties away, people researching a charge nobody has filed against them. Your reported lead count keeps climbing and your signed matters do not.
So defense firms should set a budget and then defend a ceiling, which is an unusual instruction in this business. When cost per signed matter drifts up two months running while volume climbs, the account has run out of inventory, and the fix is holding the line rather than raising it.
The management fee decides whether any of this is affordable
Small firms get squeezed at the bottom of the range, and the squeeze has nothing to do with which agency they pick. Below roughly $1,500 a month in ad spend, any competent management fee eats more than half the budget, a finding that comes straight out of our own marketing cost calculator. Our tiers are posted on the services page at $1,850 for Starter Lite through $7,500 for Scale, media paid directly to the platforms with no markup, so you can run that test against us before anyone calls you.
Here is that test with real numbers. A two-attorney family practice spends $3,000 a month on media and $2,500 on management. At the $110 median, $3,000 buys about 27 leads, and 15% of those become four signed matters. Divide the whole $5,500 by four and each new client cost $1,375, against an assumed $2,500 fee. That is more than half the revenue, and it is what the arrangement costs at that size.
Two ways out, and hiring a cheaper agency is not one of them. Raise the media budget until the fee stops dominating, or run the account yourself for a quarter and put the entire $5,500 into ads. Firms that pick the second option often find their cost per signed matter is fine and their volume was the constraint, which is a much cheaper problem than the one they thought they had. That is also the sequence we recommend to most of the small practices that call our Atlanta law firm team.
Before you set next year’s number, pull the last twelve months of signed matters and split them into columns by practice area, then divide the advertising spend into each column separately. Plenty of firms have run on one blended figure for years. Split apart, the columns rarely resemble each other, and the one that looks worst is often the one absorbing the budget.