Cost Per Engagement Calculator

Divide spend by total engagements to price social activity on an interaction basis.

About Cost Per Engagement Calculator

Dividing spend by the number of engagements gives the unit economics of the channel. The reciprocal — engagements delivered per unit of currency — is shown alongside, because that is the figure to maximise when a budget is fixed. Unit cost is the only number that lets you compare channels with wildly different budgets, and it is the input every bid and budget decision ultimately rests on.

Formula

Cost Per Engagement

Cost Per Engagement = Social ad spend ÷ Engagements

Social ad spend: Total amount spent in the period
Engagements: Countable outcomes delivered for that spend

Worked example

With the default values below, Cost Per Engagement Calculator returns Cost Per Engagement of $0.2000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Social ad spendminimum 0: 3,600
Engagementsminimum 0: 18,000

Results

Cost Per Engagement: $0.2000
Engagements per Unit of Spend: 5.00
Spend per 1,000 engagements: $200.00
Engagements Needed to Justify Spend at Current Rate: 18,000

Step by step

1Values used
2Cost Per Engagement
3Cost Per Engagement= 0.2000
4Engagements per Unit of Spend= 5.00
5Spend per 1,000 engagements= 200.00
6Engagements Needed to Justify Spend at Current Rate= 18,000

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Cost Per Engagement calculated?

Cost Per Engagement = Social ad spend ÷ Engagements Dividing spend by the number of engagements gives the unit economics of the channel. The reciprocal — engagements delivered per unit of currency — is shown alongside, because that is the figure to maximise when a budget is fixed.

Why does Cost Per Engagement matter?

Unit cost is the only number that lets you compare channels with wildly different budgets, and it is the input every bid and budget decision ultimately rests on.

What values do I need to enter?

This calculator takes 2 inputs: Social ad spend, Engagements. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.