Facebook Ads Cost Calculator
CPM to cost a click to cost a conversion, with what a ten percent improvement in each is worth and what would have to be true to break even.
Budget $5,000.00
The chain
impressions 434,783 at a $11.50 CPM
clicks 5,217 at 1.2% through
conversions 161.7 at 3.1% converting
What each one costs
a thousand impressions $11.50
a click $0.9583
a conversion $30.91
which is the CPM divided by the click-through rate and the conversion rate
A ten percent improvement in each
cheaper impressions $28.10 a conversion, 9.1% off
better click-through $28.10 a conversion, 9.1% off
better conversion rate $28.10 a conversion, 9.1% off
which means the three levers are identical in the arithmetic, and different in how much room they have
Against what a conversion is worth
order value $84.00
gross margin 55%, so $46.20 a conversion
cost a conversion $30.91
headroom $15.29 a conversion
revenue $13,586.09
gross profit $7,472.35
after the ad spend $2,472.35
return on ad spend 2.72×, against a break-even of 1.82×
verdict each conversion costs less than the margin it earns
What would have to be true to break even
CPM of $17.19
or click-through of 0.8%
or conversion rate of 2.07%
A conversion costs $30.91: a $11.50 CPM, divided by a 1.2% click-through
rate, divided by a 3.1% conversion rate. Ten percent off any one of them
takes the same 9.1% off the cost of a result.
Since the three are equal in the arithmetic, choose between them on
range rather than leverage. Creative moves click-through by a factor of
several across the same audience, landing pages move conversion rates by
two or three, and bidding moves the cost of impressions by tens of
percent. The account settings are the smallest of the three and they
absorb most of the attention.
CPM is a price set by an auction you are only one side of. It rises with
competition, through the fourth quarter, and as a campaign exhausts the
responsive part of its audience, so a plan built on a CPM measured in a
quiet month is a plan built on the best case.
Click-through rate is a creative measure and a relevance measure at
once. A high rate on an irrelevant audience produces cheap clicks that
do not convert, which is why the chain has to be read to the end rather
than stopped at the cost of a click.
The conversion rate here belongs to the landing page and the offer, not
to the ad. It is the cheapest of the three to test and the one most
often left alone, because it sits with a different team from the one
buying the media.
Cost benchmarks by industry are worth very little. The variance within
an industry is larger than the variance between industries, and your own
trend over the last few months answers more questions than any published
average.
Every figure here is an average, and averages hide the distribution.
Most campaigns have a small number of ads and audiences doing nearly all
the work; the blended cost a conversion tells you the campaign is fine
while half of it is not.
Output is valid and updates as you type.
Fix the highlighted fields to update the output.
Write out what a conversion costs and the argument about where to spend your attention mostly disappears:
cost a conversion = CPM / (1000 × click-through rate × conversion rate)Three numbers, multiplied. A ten percent improvement in any of them takes the same 9.1 percent off the cost of a result. Cheaper impressions, better creative and a better landing page are interchangeable in the arithmetic.
What is not interchangeable is how much room each has. Across creative, click-through rates vary by a factor of five or ten. Landing pages move conversion rates by two or three. Bidding and placement move the cost of impressions by tens of percent, and that is the lever most accounts spend their time on.
How to use
- Put in the budget and the CPM you expect.
- Put in the click-through rate and the conversion rate. Use your own numbers from the last month rather than a published benchmark.
- Add the order value and gross margin to see the break-even cost and what would have to change to reach it.
Example
$5,000 at an $11.50 CPM, 1.2 percent through and 3.1 percent converting, on an $84 order at 55 percent margin:
The chain
impressions 434,783 at a $11.50 CPM
clicks 5,217 at 1.2% through
conversions 161.7 at 3.1% converting
What each one costs
a thousand impressions $11.50
a click $0.9583
a conversion $30.91
A ten percent improvement in each
cheaper impressions $28.10 a conversion, 9.1% off
better click-through $28.10 a conversion, 9.1% off
better conversion rate $28.10 a conversion, 9.1% off
Against what a conversion is worth
gross margin 55%, so $46.20 a conversion
cost a conversion $30.91
headroom $15.29 a conversion
gross profit $7,472.35
after the ad spend $2,472.35
return on ad spend 2.72×, against a break-even of 1.82×
What would have to be true to break even
CPM of $17.19
or click-through of 0.8%
or conversion rate of 2.07%That last block is the useful one. It says how much room there is before the campaign stops working, in the units you actually measure.
Pitfalls
Cost a click is not the goal. A high click-through rate on the wrong audience produces cheap clicks that do not convert. Read the chain to the end, every time.
CPM is a price, not a choice. You are one side of an auction. It rises with competition, through the fourth quarter, and as a campaign exhausts the responsive part of its audience, so a plan built on a quiet month’s CPM is a plan built on the best case.
The conversion rate belongs to the landing page. It is the cheapest of the three to test and the one most often ignored, because it sits with a different team from the one buying the media.
Industry benchmarks are nearly useless. The variance within an industry is larger than the variance between industries. Your own last three months answer more questions than any published average.
Every number here is an average. Most campaigns have a handful of ads and audiences doing nearly all the work. A blended cost a conversion says the campaign is fine while half of it is not.
Break-even on gross margin is not break-even on profit. If fulfilment, payment fees and returns are material, use contribution margin instead. The break-even cost falls and some campaigns that looked comfortable stop looking comfortable.
A first conversion is not the whole value. Where repeat purchase is real and measured, a higher acquisition cost can be correct. Measured, not assumed.
Compatibility
Arithmetic in the browser: nothing is uploaded and nothing is stored.
The chain runs forward from the budget, and the unit costs are derived from it rather than entered separately, which is why they are always consistent: cost a click is the CPM over a thousand click-throughs, and cost a conversion is that over the conversion rate. The test suite asserts both identities and the equivalence of the three levers to nine decimal places, since that equivalence is the tool’s central claim.
Cost a click is printed to four places because it is frequently under a dollar and the third place changes the conclusion at volume.
The break-even section only appears when an order value is given, and it solves for each of the three inputs in turn rather than presenting a single required improvement, because which one you can move is a fact about your business rather than about the arithmetic.