What is the CPM formula this calculator uses?

CPM = cost / impressions x 1000. Media cost rearranges to CPM x impressions / 1000, and impressions to cost / CPM x 1000. The calculator applies whichever form matches the value you are solving for.

How many impressions will my budget buy at a set CPM?

Switch to the Impressions mode and enter your budget and CPM. Impressions = budget / CPM x 1000, so a $1,000 budget at a $5 CPM buys 200,000 impressions.

What is the difference between CPM and eCPM?

CPM is the agreed price per 1,000 impressions for one buy. eCPM is effective CPM, a blended yield across formats, fill, and revenue. Use the eCPM calculator for the blended figure.

Does the calculator round impressions and money?

Money is shown to two decimals (a few more when needed), and impressions are rounded to whole units since you cannot serve a partial impression. The copy button gives the precise value.

Are my budget and impression numbers uploaded anywhere?

No. The CPM Calculator runs entirely in your browser. The costs, impressions, and CPMs you type are computed on your device and never sent to ArrayKit.

CPM Calculator

Solve CPM, media cost, or impressions from any two values, right in your browser. Your campaign numbers stay on your device.

The CPM Calculator runs entirely in your browser. The media costs, impressions, and CPM figures you enter are computed on your device and never uploaded to ArrayKit.

Open the eCPM Calculator

About CPM Calculator

The CPM Calculator solves the cost-per-mille relationship in both directions. Enter any two of media cost, impressions, and CPM and it computes the third using CPM = cost / impressions x 1000. Flip the toggle to work backward: find how many impressions a budget buys at a given CPM, or the media cost required to serve a target number of impressions. It is built for media buyers, ad-ops teams, and planners who price display, video, and programmatic inventory and need a quick, exact number while building an insertion order or reconciling a campaign. Results update as you type, with clear guards on zero and negative inputs. Everything runs in your browser, so budgets, spend, and impression figures never leave your device.

Features

Solve for CPM from media cost and impressions
Solve for media cost from CPM and impressions
Solve for impressions a budget buys at a given CPM
One toggle switches which value you compute
Live results as you type, formatted with thousands separators
Tolerates currency symbols and commas in typed numbers
Clear errors on zero impressions, zero CPM, or negative inputs
Runs entirely in your browser with no campaign data uploaded

How to use the CPM Calculator

Pick whether to solve for CPM, Cost, or Impressions
Type the two values you already know
Read the computed result below the inputs
Copy the result to paste into your media plan or IO
Switch the toggle to run the calculation the other way

Example

Input

media cost: $500
impressions: 200,000

Output

CPM = 500 / 200000 x 1000 = $2.50

$500 spread over 200,000 impressions is a $2.50 CPM.

Common errors & troubleshooting

Result shows 'Enter an impression count greater than 0.' — CPM divides by impressions, so the impression field must be a positive number. Enter the real delivered or planned impression count.
CPM and eCPM do not match your report. — eCPM includes total revenue across all formats and fill; use the eCPM calculator for blended yield. This tool computes plain CPM from a single cost and impression pair.
Impressions come out as a fraction. — Impressions are shown rounded to whole units. A budget rarely divides evenly by a CPM, so round to the nearest impression when writing the plan.
Numbers with commas or a dollar sign are rejected elsewhere. — This calculator strips commas and currency symbols for you, so $1,000 and 1000 are read the same. Paste figures straight from your spreadsheet.

Frequently asked questions

What is the CPM formula this calculator uses?: CPM = cost / impressions x 1000. Media cost rearranges to CPM x impressions / 1000, and impressions to cost / CPM x 1000. The calculator applies whichever form matches the value you are solving for.
How many impressions will my budget buy at a set CPM?: Switch to the Impressions mode and enter your budget and CPM. Impressions = budget / CPM x 1000, so a $1,000 budget at a $5 CPM buys 200,000 impressions.
What is the difference between CPM and eCPM?: CPM is the agreed price per 1,000 impressions for one buy. eCPM is effective CPM, a blended yield across formats, fill, and revenue. Use the eCPM calculator for the blended figure.
Does the calculator round impressions and money?: Money is shown to two decimals (a few more when needed), and impressions are rounded to whole units since you cannot serve a partial impression. The copy button gives the precise value.
Are my budget and impression numbers uploaded anywhere?: No. The CPM Calculator runs entirely in your browser. The costs, impressions, and CPMs you type are computed on your device and never sent to ArrayKit.

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