Glossary
Short, exact definitions of the terms we use with clients.
A binding constraint is the single stage of a business that caps overall throughput. Because work flows through stages in series, improving any stage other than the binding constraint produces no additional output.
Fully-burdened cost is the total hourly cost of an employee including salary, payroll tax, benefits, software, and a share of overhead. It is typically 25% to 40% higher than salary alone.
Agency gross margin is revenue minus the direct cost of delivering the work, expressed as a percentage. A healthy services agency runs 50% to 60%. Below 40% there is no capacity left to fund growth.
Utilization rate is the share of an employee's available hours spent on billable client work. Realistic targets are 65% to 75% for delivery roles and 50% to 60% for leads and account managers.
Delivery capacity is the maximum number of accounts an agency can service at standard, calculated from hours available per role multiplied by realistic utilization, divided by hours each account consumes.
Throughput is the rate at which a business converts inputs into delivered, paid work. In a system of stages running in series, throughput equals the capacity of the narrowest stage, never the average.
An operating cadence is a fixed meeting rhythm with named owners, a standing set of numbers, and a defined escalation path. Its purpose is to surface a gap between plan and actual within days, while there is still time to close it.
Client concentration is the share of total revenue coming from a single client. Above 20% an agency carries meaningful risk; above 30% the owner effectively has a job with extra steps.
Pipeline coverage ratio is the value of qualified opportunities in progress divided by the revenue target for the same period. Three times coverage is the working minimum for an agency; below that, the target depends on every deal closing.
Close rate is the share of qualified sales conversations that become paying clients. A founder-led agency selling a considered service typically runs 20% to 30%; under 15% the sales process is the constraint rather than the pipeline.
Effective hourly rate is an account's monthly fee divided by every hour actually spent delivering it. It is the single fastest test of whether a retainer was priced correctly, because it can be compared directly against your blended cost per hour.
Realization rate is the share of delivered hours an agency actually gets paid for, expressed as a percentage. An agency can run high utilization and low realization at the same time, which is the usual reason a fully booked team produces thin margins.
Scope creep is the gradual expansion of what an agency delivers without a matching change in fee. It is rarely one decision; it is a sequence of small accommodations, each reasonable on its own, that together move an account below its margin floor.
Diagnosis before engagement is the practice of identifying which constraint binds a business before buying help to fix anything. It is what separates an engagement that installs the right system from one that installs a well-built system in the wrong place.
An agency retainer is a fixed monthly fee for a defined scope of ongoing work, priced from delivery cost rather than from market rate. The price floor is the fully-burdened monthly cost of delivering that scope divided by target gross margin, and 50% is the reasonable floor for that margin.
Account manager ratio is the number of client accounts one account manager carries at the same time. Derive it from hours rather than from headcount: available hours at a 50% to 60% utilization target, divided by the hours one account consumes each month, including the internal prep behind every client call.
Revenue per employee is annual agency revenue divided by full-time equivalent headcount, contractors included at their FTE share. A healthy services agency runs $150,000 to $200,000 per FTE. Below $120,000 the agency is almost always over-staffed on coordination rather than on delivery.
A utilization target is the planned share of a role's available hours spent on billable client work, used as a capacity planning input. Hydra plans delivery roles at 65% to 75% and leads and account managers at 50% to 60%. A model built at 85% shows up later as unpaid overtime or dropped quality.
Bench time is the share of a delivery role's planned billable hours that no client account is consuming. It equals the utilization target minus actual utilization: a designer planned at 70% and billing 50% carries 20 points of bench, paid at fully-burdened cost every month it persists.
Gross revenue retention is the share of last period's recurring revenue still billing this period from the same clients, before any upsell is counted. The formula is starting monthly revenue minus churned and downgraded revenue, divided by starting revenue. It cannot exceed 100%, which is what makes it the honest churn number.
Net revenue retention is this period's revenue from clients who were already clients last period, divided by what those same clients paid then, with expansions and downgrades both counted. Above 100% the existing book grew faster than churn removed it, so the agency would grow with no new business at all.
Sales velocity is the revenue an agency's pipeline produces per day. Multiply the number of qualified opportunities by average deal value and by close rate, then divide by the average days from first qualified call to signature. It is the one figure that moves when any of its four inputs moves.
A discovery call is the first structured conversation with a prospect, run to agree on the problem and what it costs them before any price is discussed. Hydra's default is to keep discovery and pricing on separate calls, since pricing on the discovery call is the most common cause of an agency close rate under 15%.
Lead-to-close time is the number of days between a prospect's first qualified conversation and a signed agreement, measured per deal and reported as a median. Start the clock at the qualified conversation rather than at the lead, because the unqualified stretch is a marketing variable rather than a sales one.
Cost per acquired client is total sales and marketing spend in a period, including the fully-burdened time of whoever sells, divided by the number of new clients signed in that period. Leaving the founder's selling hours out of the numerator is the usual reason an agency believes its acquisition is cheap.
Payback period is the number of months a new client's gross profit takes to repay what it cost to acquire them: cost per acquired client divided by monthly fee times gross margin. At a 50% gross margin, a client acquired for twice their monthly fee pays back in four months.
LTV to CAC is the gross profit a client produces over their full tenure divided by what it cost to acquire them. Lifetime value for a retainer client is monthly fee times gross margin times months retained, so the ratio moves with retention and margin at least as much as with sales spend.
Founder-led sales is the stage where an agency's founder personally runs every discovery and closing call. It typically produces the agency's best close rate, often around 40% against 12% for a first sales hire, and it is also the constraint that stalls most agencies somewhere near $100k a month.
A sales-qualified lead is a prospect who has agreed to a discovery call and matches the ideal client profile on revenue band, service fit and decision authority. Only these count toward pipeline coverage. A contact who has not agreed to a conversation is a marketing lead, whatever the CRM calls them.
An ideal client profile is the written description of the accounts an agency earns the most gross margin on and keeps the longest, stated as checkable criteria: revenue band, vertical, service fit and who signs. Build it from the current client list ranked by effective hourly rate rather than from who the founder would prefer to work with.
A capacity model is a spreadsheet that converts headcount into the number of accounts an agency can serve at standard: hours available per role, times a realistic utilization target, divided by the hours one account actually consumes. Measured consumption usually runs about 1.4 times the quoted scope.
A delivery pod is a fixed roster of delivery roles with a known client capacity and a known margin, run as one repeatable unit. An agency staffs it, fills it to capacity, then clones it. Two pods coordinate themselves; somewhere around the third, someone has to own capacity across pods.
Blended rate is an agency's average fully-burdened cost per delivery hour across every role that touches client work, weighted by the hours each role contributes. Each role's input is salary times 1.25 to 1.4, divided by roughly 1,700 productive hours a year, so the blended figure runs 25% to 40% above a salary-only rate.
A write-off is delivered work an agency never invoices, whether because scope grew without a conversation, a thin brief caused rework, or the hours were never quoted in the first place. Write-offs are the gap between utilization and realization, and they cost the agency fully-burdened rate rather than nothing.
