How to measure your enquiry-to-instruction conversion rate

Your enquiry-to-instruction conversion rate is the share of genuine enquiries that become opened matters in a given period. To measure it, you need three things: an agreed definition of an enquiry, a record of every one that arrives (including the calls nobody answered), and the instruction date and source of each new matter. Divide instructions by qualified enquiries for the same cohort, and you have it. The rest of this post is about doing that honestly, because the easy version of the number is usually wrong in the firm's favour.

This is part of our series on revenue operations for law firms, which sets out the full journey from first call to repeat instruction.

Why does this number matter so much?

Because it separates two very different problems that look the same on the bank statement.

If instructions are down, either fewer people are contacting the firm, or the same number are contacting it and fewer are instructing. The first is a marketing problem. The second is an operations problem. They have different fixes, different owners and different costs. A firm that cannot tell them apart usually spends money on the first when it has the second, because more marketing is the fix everybody already knows how to buy.

The conversion rate is also the number that moves fastest when you fix the front door. Answering more calls, replying faster and asking better questions on the first call all show up here within weeks.

What counts as an enquiry?

This is the step most firms skip, and it is the one that decides whether the number means anything.

Write a one-sentence definition and get the partners to agree it. A reasonable starting point:

• An enquiry is any first contact from a person or business, not yet a client on this matter, asking about a legal service the firm could provide. It includes calls that were not answered, if a number was left or captured.
• It excludes existing clients calling about an open matter, other firms, suppliers, recruiters, sales calls, and wrong numbers.

The trap is the unanswered call. If the definition only counts enquiries somebody spoke to, the firm will never see the ones it lost before anyone picked up, and those are often the cheapest to recover. Your phone system's call log will list missed calls. Cross-check a week of them against your enquiry log and you will know whether this matters for you.

What counts as qualified?

Not every enquiry is one the firm would take. Some are in a practice area you do not offer. Some are outside your geography. Some cannot afford the service and are not eligible for legal aid you provide. Some have a conflict.

A qualified enquiry is one where the firm could act and would want to. Write down the tests. Keep them short and objective:

• Service. Is it a matter type the firm handles?
• Capacity. Could somebody take it on within the time the client needs?
• Conflict. Has a conflict check been passed, or would it plausibly be?
• Fit. Does it meet any minimum the firm sets (value, complexity, location)?

The point of this step is not to shrink the denominator to make the rate look good. It is to separate "we lost them" from "we were never going to take them". Those are different conversations with different people.

How do you calculate it?

Use a cohort, not a calendar. That is the main technical point, and it is worth getting right.

The naive method is: instructions opened in September divided by enquiries received in September. The problem is that a matter opened on 3 September probably came from an enquiry in August, and an enquiry on 28 September may instruct in October. In a practice area with a short decision cycle the error is small. In one where clients take weeks to decide, the number swings about for no reason.

The cohort method is: take every qualified enquiry received in September, and count how many of those had instructed by a fixed cut-off, say 60 days after the end of the month. That gives you a stable number you can compare month to month, at the cost of waiting for it.

In practice, run both. The calendar version gives you a rough weekly signal. The cohort version is the one you report.

A worked example

The figures below are invented to show the method. They are not a benchmark and do not describe a real firm.

An employment team logs its September enquiries:

• Total enquiries logged: 80, of which 14 were missed calls with a number captured.
• Not qualified: 22 (outside the team's work, or a conflict).
• Qualified enquiries: 58.
• Instructed within 60 days: 17.

The cohort conversion rate is 17 divided by 58, which is about 29 per cent.

Now break it down by what happened on first contact:

• Answered on the first call, or replied to on the same working day: 40 qualified, 15 instructed. About 38 per cent.
• Reached later: 18 qualified, 2 instructed. About 11 per cent.

In this invented example, the difference between the two groups is the story. The fee-earners' skill at the consultation is the same in both groups. What differs is how long the person waited. That pattern, where a late reply converts far worse than a prompt one, is the thing to look for in your own data. Your numbers will differ, but if the gap is there it tells you where to spend effort.

What makes the number lie?

Five traps come up again and again.

Counting only answered calls. Covered above. It removes the easiest losses from view.

Counting existing clients as new enquiries. A client of the conveyancing team calling about a will is a cross-referral, which is valuable, but it converts at a different rate from a stranger. Track it separately or it flatters the whole number. There is more on this in repeat instructions and referral sources.

Letting the definition drift. If one fee-earner logs every call and another logs only the promising ones, the second will look like a better converter. Agree the definition and audit a sample each month.

Mixing practice areas. A conveyancing enquiry and a complex commercial dispute have nothing in common as a sales process. A firm-wide rate is a useful headline, but decisions should be made on per-team numbers.

Tiny samples. A team that gets eight enquiries a month will see its rate jump by 12 percentage points when one person changes their mind. Look at a rolling three-month figure before drawing conclusions.

Where do you get the data without making fee-earners type it?

This is where most attempts fail. The measurement depends on somebody writing down every enquiry, consistently, and the people who take enquiries are busy.

Three sources need no new typing:

• The phone system's call log. It records every inbound call, answered or not, with the time and the number. It will not tell you what the call was about, but it tells you how many you missed and when.
• The website form. Every submission lands somewhere with a timestamp.
• The practice management system. Every matter opening has a date, and most systems have a field for the source.

The gap is the middle: what each enquiry was, and whether it was qualified. That is the part that needs a person, or a system that captures it at the moment the enquiry is taken. If you capture it at the point of the call rather than reconstructing it later, it is accurate and costs almost nothing. If you reconstruct it at the end of the month, it is guesswork.

What should you do with the number?

Look for the biggest gap, fix that, and measure again.

• If a lot of calls are never answered, fix cover first. This includes lunchtimes, court days and after five. The options are in who answers your law firm's phone after five.
• If calls are answered but replies are slow, look at who owns the call back and whether they know they own it. The handover problem is covered in where enquiries get lost between reception, fee-earners and billing.
• If replies are fast but conversion is still low, look at what the person is told on first contact. Price is the first thing most people compare. The Legal Services Consumer Panel's 2025 tracker found that 56 per cent of people who shopped around compared on price, ahead of reputation at 48 per cent. See SRA price transparency: an operations guide for intake.
• If conversion is good but volume is low, that is when to spend on marketing, and not before.

Report the conversion rate alongside the other numbers in the KPIs a managing partner should actually watch, so it is read in context.

How fast will it change?

Faster than most operational metrics. Fixing phone cover or reply times affects enquiries from the day you change it, and a cohort measure will show the difference within one or two cycles. Changes to how fee-earners run consultations take longer to show, because they depend on behaviour, and behaviour changes slowly.

A caution: when you start measuring properly, the rate often goes down. That is not the firm getting worse. It is the missed calls, which were always there, arriving in the denominator for the first time. Warn the partners before you show them the first month.

A one-page template for the monthly review

Keep the review short enough that it actually happens. One page, the same layout every month, read in the first partners' meeting of the month. A workable template:

• Headline. Qualified enquiries, instructions and the cohort conversion rate for the month that has just matured, with the same figures for the previous three.
• By team. The same three numbers for each practice area, with the rolling three-month rate beside each.
• By first response. Conversion for enquiries answered or replied to on the same working day, against those reached later.
• By channel. Phone, web form, email and referral, so a drop in one is visible even when the total holds.
• Missed calls. The count from the phone log, split into working hours and out of hours.
• One change. The single process change the firm will make this month, and who owns it.

The last line is the one that matters. A review that ends without a named change is a report, and reports do not move the number. Next month, check whether the change was made before you discuss whether it worked.

Where WasilX fits

The measurement above breaks on the calls nobody answers and the details nobody writes down. That is the part we built for. Cam, our AI Engagement Coordinator, takes calls on the firm's line, including evenings and weekends, says that it is AI, asks the qualification questions the firm has chosen, and sends a written summary to the right fee-earner. Every enquiry is recorded at the moment it happens, so the first half of this calculation stops depending on memory. The judgement about whether to take the matter stays with the firm.

If you want to see what your own conversion looks like once the missed calls are counted, we can walk through it with you.

Frequently asked questions

What is a good enquiry-to-instruction conversion rate for a law firm? We do not know of a reliable published UK benchmark, and rates vary so much by practice area that a single figure would mislead. Compare your firm with itself over time, and compare teams only with care.

Should referrals be counted separately? Yes. A referred enquiry usually converts better than a cold one, so mixing them hides changes in either.

Do we need software to do this? No. A spreadsheet works for the first few months. Software helps when it captures the data without anybody typing it.