Explainer
Capital Burn Velocity
The number behind your CLV:CAC ratio. The ratio tells you whether your acquisition engine creates or destroys value. Burn Velocity tells you how fast.
The CLV:CAC ratio answers a yes-or-no question: is each customer worth more than it costs to win? Capital Burn Velocity converts that static ratio into a rate, the pounds per month your acquisition engine is creating or destroying. A ratio gets noted in a meeting. A number per month gets acted on.
A note on scope. Burn Velocity measures the acquisition engine specifically, the economics of winning new customers. It is not a measure of total company cash burn, and it is not runway. Those are separate questions, and conflating them is the first mistake to avoid.
1A ratio is a status. A velocity is a rate.
The CLV:CAC ratio is a status. It tells you whether, on average, a customer returns more than it costs to acquire. At 3:1 the engine is healthy. At 0.5:1 it is not. What the ratio does not tell you is the pace: how much capital that position is creating or consuming, month after month, while nothing in the business changes.
Capital Burn Velocity supplies the pace. It takes the gap between what you pay to win a customer and what that customer is worth, then multiplies it by how many customers you win each month. The result is a flow, expressed in pounds per month and annualised to a run-rate.
The ratio tells you if. The velocity tells you how fast. A CFO who is unmoved by a ratio tends to sit up when the same position is restated as a number per month.
2How it is calculated
The calculation is deliberately simple. It rests on two figures the diagnostic produces, and one you already know.
CAC
won
Velocity
New Customer CAC is the fully-loaded, acquisition-only cost of winning one new customer. It is not blended with retention or account management. net CLV is that customer's lifetime value after cost-to-serve, discounted to a present value. It is a net present value, not a revenue projection. The difference between the two is the per-customer economic gap: when it is positive, each customer is won for more than it will ever return.
Multiply that gap by the number of new customers won each month and the per-customer number becomes a monthly flow. A positive gap produces a positive velocity, capital leaving the business. A negative gap produces a negative velocity, capital being created. The sign is the whole point.
3A worked example
A business wins customers through a defined sales motion. The diagnostic returns a fully-loaded acquisition cost and a discounted, cost-to-serve-adjusted lifetime value. The two numbers are further apart than anyone expected.
through the acquisition engine
4The 1:1 line is where it pivots
The number everyone quotes is 3:1, the benchmark for a healthy B2B model. But Burn Velocity does not pivot on 3:1. It pivots on 1:1, the point where lifetime value exactly equals acquisition cost.
destruction
shortfall
value created
Below 1:1, the gap is positive, the velocity is positive, and the engine is destroying capital. This is burn in the literal sense. Above 1:1, the gap turns negative, the velocity turns negative, and the engine accumulates capital with every customer won.
Between 1:1 and 3:1, the engine is value-positive but below the sustainability target. This is not destruction. It is a margin-of-safety shortfall: the business makes money on each customer, just with less cushion than a durable model wants.
A business at 2:1 is not burning capital. It is creating value with a thin margin of safety. Calling that destruction would be wrong, and it would cost you credibility with the one person in the room who is checking.
5The insight that changes the budget conversation
The reason Burn Velocity changes the conversation is what it does to the request for more budget.
When a business is below 1:1, the instinct to invest more in acquisition, to test and learn a way out, is exactly backwards. Every additional pound of acquisition spend wins more customers at a loss. More customers per month raises the multiplier. The velocity increases. In plain terms, more budget to test and learn becomes spending faster to destroy value faster.
That is the sentence a CFO understands at once. The ratio told them the engine was inefficient. Burn Velocity tells them that scaling it, without fixing it first, accelerates the loss. The order of operations is fixed: repair the unit economics, clear 1:1 with a margin of safety, then scale.
6What it is, and what it is not
Burn Velocity is precise, and a sharp CFO will test its edges. Holding these distinctions is what keeps it credible.
- It is the value rate of the acquisition engine, not company cash burn.
- It isolates the economics of winning new customers. A profitable company can still have an acquisition engine that destroys value in a segment, and a company with healthy acquisition economics can still be burning cash for other reasons. Runway is a separate question.
- It is a run-rate, not a forecast.
- It states the pace at today's position. It is not a prediction of future cash flows, and it does not assume the position holds.
- "Destroying capital" is reserved for a ratio below 1:1.
- Between 1:1 and 3:1, the correct phrase is a margin-of-safety shortfall. Break-even is 1:1; the 3:1 figure is the sustainability target, not the line at which destruction begins.
- It is a named, owned metric.
- Capital Burn Velocity, like the brand tax, is a defined term: the rate of capital creation or destruction in the acquisition engine, in pounds per month.
Burn Velocity is one of the two headline outputs of the diagnostic.
Calibrate, the free ten-minute self-assessment, will indicate whether your acquisition engine is likely running up cost or leaving value on the table. It is an indication, not a measurement. The Commercial Logic diagnostic is where your fully-loaded CAC, net CLV, the CLV:CAC ratio and your Capital Burn Velocity are calculated to finance standards.
What is Capital Burn Velocity?
Capital Burn Velocity is the rate, in pounds per month, at which a company's customer acquisition engine creates or destroys value. It restates the CLV:CAC ratio as a flow: the per-customer gap between acquisition cost and lifetime value, multiplied by the number of new customers won each month. The ratio tells you whether the engine is healthy; Burn Velocity tells you how fast it is helping or hurting.
How is Capital Burn Velocity calculated?
Burn Velocity per month equals New Customer CAC minus net CLV, multiplied by new customers won per month, then annualised by multiplying by twelve. New Customer CAC is the fully-loaded, acquisition-only cost of winning one customer. net CLV is that customer's discounted lifetime value after cost-to-serve. The gap between them, multiplied by monthly new customers, is the velocity.
Is Capital Burn Velocity the same as burn rate or burn multiple?
No. Burn rate and runway describe total company cash consumption. Burn Velocity isolates the acquisition engine: the economics of winning new customers specifically. A profitable company can still have an acquisition engine that destroys value in a given segment, and a company with healthy acquisition economics can still be burning cash for other reasons. The two questions are separate.
What does a CLV:CAC ratio below 1:1 mean for Burn Velocity?
Below 1:1, each customer costs more to acquire than it will ever return, so the per-customer gap is positive and the engine is destroying capital. At that point, increasing acquisition spend wins more customers at a loss and raises the rate of destruction. The honest trigger for the phrase "destroying capital" is a ratio below 1:1.
Does a ratio between 1:1 and 3:1 mean we are destroying capital?
No. Between 1:1 and 3:1 the engine is creating value on every customer, just with less cushion than a durable model wants. The correct description is a margin-of-safety shortfall, not destruction. Capital destruction begins below 1:1; the 3:1 figure is the sustainability target, not the break-even line.
Alan Edwards is the founder of Why Marketing, a commercial advisory practice focused on B2B unit economics. He works with CFOs, PE partners, and senior marketing leaders on the measurement and optimisation of customer acquisition cost and customer lifetime value.