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CPM Calculator

Cost per 1,000 impressions. Free online CPM Calculator. Calculate cpm online — fast, accurate, mobile-friendly, no signup needed.

CPM
$5.00

Derivation

  1. ├── 01Givencost = 500, imp = 100000
  2. ├── 02Formulae.cost / e.imp × 1e3
  3. ├── 03Substitutee.500 / e.100000 × 1e3
  4. └── 04Compute CPM$5.00
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§01What is

Understanding the CPM Calculator

The CPM Calculator computes CPM from 2 inputs: spend ($), impressions. Cost per 1,000 impressions.

Quick calculators for the math that shouldn’t need a notepad — instant, accurate, private to your browser. The CPM Calculator sits in that toolkit — it cost per 1,000 impressions. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.cost / e.imp × 1e3

Where

cost
Spend ($)
imp
Impressions
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Spend ($) = 500, Impressions = 100000.

  1. 01Start by noting the input — Spend ($): 500.
  2. 02Start by noting the input — Impressions: 100000.
  3. 03Substitute these values into the formula: e.cost / e.imp × 1e3
  4. 04Compute CPM: the calculator returns 5.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common CPM Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Spend ($) halved

cost = 250 (from 500)

Keep every other input at its default and halve the spend ($). See how cpm responds.

  1. 01New Spend ($): 250
  2. 02Baseline CPM: 5
  3. 03New CPM: 2.5
  4. 04CPM decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Spend ($) doubled

cost = 1000 (from 500)

Keep every other input at its default and double the spend ($). See how cpm responds.

  1. 01New Spend ($): 1000
  2. 02Baseline CPM: 5
  3. 03New CPM: 10
  4. 04CPM increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Impressions halved

imp = 50000 (from 100000)

Keep every other input at its default and halve the impressions. See how cpm responds.

  1. 01New Impressions: 50000
  2. 02Baseline CPM: 5
  3. 03New CPM: 10
  4. 04CPM increases by 100% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Impressions doubled

imp = 200000 (from 100000)

Keep every other input at its default and double the impressions. See how cpm responds.

  1. 01New Impressions: 200000
  2. 02Baseline CPM: 5
  3. 03New CPM: 2.5
  4. 04CPM decreases by 50% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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