Channel CAC & Blended CAC Calculator

Blended CAC divides total acquisition spend by total new customers. It is a useful headline, but it can hide whether paid search, outbound sales, referrals, partners, or organic traffic are pulling the average up or down.

Channel CAC calculates the same cost-per-customer formula for each acquisition source. A company can have an acceptable blended CAC while one paid channel is far above the payback ceiling.

This calculator keeps the inputs manual so you can compare finance reports, CRM exports, ad-platform summaries, or board-pack assumptions without importing account data.

Suppose paid search spends £12,000 and wins 55 customers, referrals cost £1,500 and win 38, and outbound sales costs £9,000 and wins 26. The blended CAC across all channels is lower than the outbound CAC, but higher than the referral CAC.

That matters when you plan the next budget. Scaling the average can be misleading if the next incremental customers are likely to come from the expensive paid or sales channels rather than the lower-cost referral channel.

The spend share and customer share columns show whether a channel consumes more budget than its customer contribution justifies.

Blended CAC can look acceptable when low-cost referrals offset expensive paid acquisition. That does not mean the paid channel is safe to scale.

A channel with high CAC can still be viable if it wins larger accounts, better retention, or faster expansion revenue. In that case, compare CAC with channel-specific LTV.

A cheap channel can also be capacity-limited. Referral CAC may look excellent but may not produce enough customers to replace paid channels.

Channel CAC gets noisy when spend and customer counts come from mismatched periods. A campaign launched in March may produce qualified leads in March but paying customers in April or May.

Use the lag-days field as a reminder of the expected conversion delay. For board reporting, compare spend with the cohort of customers that spend actually produced, not simply the same calendar month.

Long sales cycles often need channel CAC by cohort. Short-cycle ecommerce campaigns can often use tighter weekly or monthly windows.

It does not import ad-platform data, attribute multi-touch journeys, decide whether brand spend should be amortised, or prove incrementality. It uses the numbers you enter.

It does not replace the LTV vs CAC breakeven calculator. Once you know the CAC by channel, compare each channel with LTV and payback before scaling acquisition spend.

List each acquisition source separately: paid search, paid social, outbound sales, referrals, partners, organic search, events, or any channel that has its own budget and customer count.

Use matching measurement windows. If customers arrive after a 30 or 45 day lag, compare spend with the cohort of customers that spend produced rather than a convenient calendar month.

Review spend share beside customer share. A channel that uses half the budget but wins a quarter of customers needs a stronger LTV, better conversion rate, or a budget cut.

After finding channel CAC, compare each segment with LTV vs CAC breakeven instead of relying only on company-wide blended CAC.

This page should target channel CAC calculator, blended CAC calculator, paid CAC calculator, organic CAC, CAC by channel, and customer acquisition cost by channel searches.

It calculates manual per-channel CAC, blended CAC, paid/sales CAC, organic/partner CAC, spend share, customer share, and variance from blended CAC.

It does not import ad-platform data, attribute multi-touch journeys, decide incrementality, amortise brand campaigns automatically, reconcile CRM data, or replace finance reporting definitions.