Whether you're using AdWords to increase conversions such as sales, leads, downloads, you'll want to measure your return on investment (ROI) — the ratio of your net profit to your costs.
Why calculate your ROI? You'll learn how much money you've made by advertising with AdWords and can use that information to help you decide how to spend your budget. For example, if a certain campaign is generating a higher ROI compared to others, you can apply more of your budget to the successful campaign and less on the ones that aren't performing as well.
Calculate your ROI
The exact method you use to calculate your ROI depends on your goals, but here's one way to define it:
ROI = (Revenue - Cost of goods sold) / Cost of goods sold
Example
Let's say you have a product that costs US$100 to produce and it sells for US$200. You sell 6 of these products as a result of advertising on AdWords. Your total sales are US$1200 and your AdWords costs are $200.
Your ROI is...
($1200 - ($600 + $200))/($600 + $200) = 50%
Here's how to measure your ROI based on your business goal:
Conversions
Once you've started to measure conversions, customer actions that you believe are valuable, you can evaluate your ROI. You can use conversion tracking or Google Analytics to determine the profitability of a keyword or ad, and track conversion rates and cost-per-conversion. Keep in mind that the value of each conversion should be greater than the amount you spend to get that conversion.
Sales
If your business is web-based sales, you'll need the revenue made from AdWords advertising (this is the conversion value that you set), costs related to your products sold, and your AdWords costs.
You'll want to calculate your net profit by subtracting your overall costs from your AdWords revenue for a given time period. Then divide your net profit by your overall costs to get your ROI for that time period. Here's the formula:
Ratio to profit of overall costs = Revenue (measured by conversions) - overall costs/overall costs
Page views, leads, and more
If you're interested in calculating the ROI for a page view, lead, or other goal, you'll use a different formula.
First, you'll want to estimate the value of the action that you'd like to measure. To calculate your ROI, you'll subtract your overall costs from your overall revenue. Then divide your net profit by your overall advertising costs. Here's the formula:
Advertising ROI % = (Total revenue - Total cost)/Advertising costs x 100
Example
Here's how the numbers for your AdWords campaign might look:
Campaign costs: US$25000 per year
Leads: 5000
Customers: 500
Net profit: US$100 (after taking your business costs into account)
The value of each lead is your total net profit (500 x US$100) divided by the number of leads (5000), or US$10.
Your ROI for this AdWords campaign is 200% (US$50000 total net profit/US$25000 advertising costs) x 100.
You can also estimate values for your leads and page views using a cost-per-acquisition (CPA) measurement. Using CPA allows you to focus primarily on how your advertising costs compare to the number of acquisitions those costs deliver. Using the above example again, your campaign may cost US$25000, resulting in 500 sales. So your CPA for that campaign is US$50. Here's the formula:
CPA = (Costs/Sales)
Note that your CPA shouldn't exceed the profit you made from each acquisition.
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