The three ratios
A professional services business converts hours into cash through three steps, and each step has a leak.
- Utilization: what share of available hours were billable at all. Measures whether people are busy.
- Realization: what share of billable hours were actually billed and collected at standard rate. Measures whether busy turned into revenue.
- WIP and days sales outstanding: how long delivered work sits before it becomes cash. Measures whether revenue turned into money.
Why utilization alone misleads
A firm at 85 percent utilization and 70 percent realization is working flat out and losing nearly a third of the value on the way to the invoice. The dashboard says the team is busy. The bank account says otherwise. Realization is the ratio most firms do not compute.
Utilization, measured honestly
Utilization is billable hours divided by available hours. The argument is always about the denominator.
Using a 2,080 hour year makes every number look bad and hides the trend. Using capacity net of holiday, leave and a stated allowance for internal work gives a figure people will act on. Either is defensible. What is not defensible is changing it quietly between quarters.
- Set the denominator once and document it
- Track by person, by role and by team, because the average conceals everything
- Watch the shape rather than the level: 60 percent steady beats an average of 60 from alternating 90 and 30
- Include a target for internal and business development time rather than treating it as failure
Realization is where the margin goes
Realization compares what you billed against what the delivered hours were worth at standard rate. It falls for a small number of specific, fixable reasons.
- Scope creep absorbed rather than charged as a change order
- Discounting at the proposal stage that nobody tracks afterwards
- Write-offs at invoicing because the partner does not want the client conversation
- Fixed-fee work priced on an optimistic hour estimate
- Rework that gets delivered but never billed
WIP: the cash trap
Work in progress is delivered work not yet invoiced. It is an asset on the balance sheet and a problem in the bank account, because a firm can be fully utilized, well realized, and still short of cash if WIP sits for six weeks before billing.
The fix is usually process rather than analysis: bill on a fixed calendar rather than when the project reaches a milestone, and treat unbilled work older than 30 days as an exception requiring a reason.
- Measure WIP days alongside days sales outstanding, because the two together are the real cash cycle
- Bill on a schedule, not on a feeling that the work is far enough along
- Escalate unbilled work over 30 days as an exception with a named owner
- Watch WIP concentration: one large unbilled client is a different risk from many small ones
Putting them together
Multiply the three and you have the story. Utilization times realization gives effective rate per available hour, which is the number to manage. Add WIP days and days sales outstanding and you know how long it takes that rate to become cash.
Firms that review all three monthly, by team, catch a margin problem in the quarter it starts. Firms that review utilization alone find out at year end.