AD SPEND & GROWTH

Blended CAC Calculator

Combine channel spend and new customers into a blended CAC, compare channel CACs, and test whether first-order contribution covers acquisition cost.

Currency: USD only. New customers are acquired customers, not orders; attribution differences are not reconciled.

Channel spend and new customers

Paid social spendMonthly spend on paid social.Paid social new customersNew customers attributed to paid social.Paid search spendMonthly spend on paid search.Paid search new customersNew customers attributed to paid search.Other marketing spendInfluencers, affiliates, tools and other acquisition spend.Other new customersNew customers attributed to other channels.Brand spendBrand campaigns without direct new-customer attribution.Include brand spendIncluding brand spend raises blended CAC.First-order contributionContribution per new customer after COGS, fees and fulfillment.

Planning model. Attribution differences, organic and returning customers, time lag, currency conversion and overhead are excluded. New customers are counted once per acquired customer.

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Blended CAC and coverage

Blended CAC

$40.00Total spend ÷ new customers.

Total acquisition spend$12,000.00Included channel and brand spend.

New customers300Attributed new customers.

First-order contribution$30.00Per new customer, before later purchases.

CAC coverage75.0%First-order contribution ÷ blended CAC.

First-order statusNot coveredWhether the first order covers CAC.

Include brand spendNo, excludeIncluding brand spend raises blended CAC.

Channel CAC

Each channel uses its own spend and new-customer count.

Channel	Spend	New customers	CAC
Paid social	$6,000.00	120	$50.00
Paid search	$4,000.00	100	$40.00
Other	$2,000.00	80	$25.00

How blended CAC is calculated

Total spend = paid social + paid search + other + brand spend if included. Blended CAC = total spend ÷ total new customers. Coverage = first-order contribution ÷ blended CAC; below 100% means the first order does not recover acquisition cost.

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Blended CAC: what one new customer really costs

Channel dashboards report their own CAC. The business needs a blended number: all acquisition spend divided by all new customers. This calculator builds that number from up to three channels, lets you include or exclude brand spend, and checks whether the first order covers the cost.

Blended CAC versus channel CAC

Channel CAC is useful for allocation: paid social at $50 and paid search at $40 tells you where the next dollar may work harder. Blended CAC is useful for the business: it answers what the whole acquisition engine cost per new customer, including channels that do not report cleanly.

Both numbers can be true. A channel can look cheap on its own dashboard while the blended number rises because brand spend or an unattributed channel is doing part of the work.

What belongs in the numerator

Include paid social, paid search, influencers, affiliates and acquisition tools. Brand spend is a judgment call: if it supports acquisition but cannot be attributed to new customers, excluding it understates the true cost; including it raises blended CAC but reflects the total budget.

The denominator is new customers, not orders and not revenue. A returning customer who buys again is not a new acquisition, even though the order counts in revenue.

Worked example

Paid social $6,000 / 120 new customers = $50. Paid search $4,000 / 100 = $40. Other $2,000 / 80 = $25. Total spend is $12,000 and total new customers are 300, so blended CAC is $40.

If $3,000 of brand spend is included, total spend becomes $15,000 and blended CAC becomes $50. The channel CACs do not change; only the blended view does.

Does the first order cover CAC?

With a $30 first-order contribution, coverage is $30 ÷ $40 = 75%. The first order does not recover the acquisition cost; the customer needs a second purchase or a higher contribution to break even.

This is not automatically a failure. A subscription or repeat-purchase business can justify a first-order loss. The ratio makes the payback requirement explicit instead of hiding it in a blended ROAS.

Where the model stops

It does not reconcile platform attribution, include organic new customers, split by cohort or model time lag. It also assumes one currency and one monthly period. A brand campaign that lifts organic search will look expensive here unless you account for the assisted demand separately.

Use the break-even ROAS calculator for the advertising threshold and the Shopify net profit calculator for order-level profit. This tool is about acquisition cost, not margin.

How to use it

Compare channel CAC first, then check the blended number with and without brand spend. Set a maximum CAC from first-order contribution and target payback, and revisit the numbers monthly as spend mix changes.

Do not optimize to the lowest CAC alone. A cheap channel that brings low-value customers can be worse than an expensive channel with strong repeat behavior.

CAC references checked October 2026: Shopify CAC guide · Triple Whale · TrueProfit tools

What is the difference between CAC and blended CAC?+

CAC usually refers to a channel or campaign cost per new customer. Blended CAC divides all acquisition spend by all new customers, so it includes channels that are hard to attribute and any brand spend you choose to include.

Should brand spend be included?+

It depends on the question. Exclude it to approximate performance-marketing CAC; include it to reflect the total acquisition budget. Show both if the gap is material, and state which definition you are using.

Why use new customers instead of orders?+

CAC is the cost of acquiring a customer, not the cost of generating an order. Using orders would count repeat purchases and understate the cost of each new customer.

What does CAC coverage below 100% mean?+

The first-order contribution is lower than the acquisition cost. The customer needs later purchases, a higher contribution or a lower CAC to break even. It does not automatically mean the channel should be stopped.

Does this include organic customers?+

No. The denominator is only the new customers attributed to the channels you enter. Organic new customers are excluded, which is why blended CAC here is a paid-acquisition view rather than a full-business CAC.

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