See how much of your ad spend never reaches a usable page.

What does this calculator actually compute?

One multiplication. Enter your monthly ad spend across the channels you want to include, then enter the share of visitors you believe leave your site before it becomes usable: a number you can estimate or, better, pull from your own analytics. The calculator multiplies the two and shows the dollar amount of spend landing on visitors who left before the page did its job.

That is all it does. The tool does not look up an industry bounce rate. It does not apply a formula linking load time to conversion, and it does not predict what would happen if your website got faster. Every number in the result is a number you entered.

How should a dealership read the result?

A larger figure means a larger share of the entered spend is landing on visitors who left before the page was usable, using the drop-off rate you supplied. A smaller figure means the opposite. Neither figure says whether that drop-off rate is typical, unusual, or fixable, only what it implies about the spend you entered, arithmetically.

The result is worth comparing across channels and across time, using the same method each time, instead of treating any single reading as a verdict. A figure that grows from one month to the next is a more useful signal than the figure itself in isolation, since it points at a landing page that got slower or a campaign that started sending traffic somewhere new.

Where does the drop-off number come from?

The most defensible source is your own analytics. A bounce rate or exit rate on the specific landing pages your campaigns send traffic to, over a real reporting window, is what to use. How to test dealer website speed covers how to identify which pages to check.

If you do not have that number yet, you can enter an estimate to see how the arithmetic behaves. The calculator will not tell you whether your estimate is realistic, because that is not a question arithmetic can answer. It is a question your own analytics can answer.

Why use a calculator instead of a spreadsheet?

There is no reason a spreadsheet could not do the same multiplication. This calculator does nothing a spreadsheet cannot. What it offers instead is speed and a shareable link. No formula to type, no cell reference to get wrong, and a result you can show a general manager or an agency without first explaining the math behind it.

If you would rather do the arithmetic yourself, it is one calculation: monthly ad spend multiplied by your drop-off rate expressed as a decimal. Nothing on this page depends on using the tool specifically.

What this calculator is not

The distinction matters because those are the kinds of claims this site's own publication standard does not allow without a study behind them. This tool avoids the question entirely by never asserting a number it did not receive from the visitor.

• Does not forecast what a faster website would do to your numbers
• Not based on an industry-average bounce rate or elasticity curve
• Not a substitute for measuring your own traffic under a controlled method
• Not a claim about DealerSpeed Engine's own effect on any dealership's spend

What should a dealership do with the result?

1. 01

   Start with your own analytics, not a guess

   A real bounce or exit rate on your actual landing pages is worth more than an estimate.

2. 02

   Run the number for each channel separately

   Paid search, paid social and email each send traffic to different pages with different drop-off rates.

3. 03

   Treat the result as a starting question, not a finding

   A large figure is a reason to measure your actual landing pages, not a number to report as fact.

4. 04

   Follow up with a real speed analysis

   A free speed analysis on this site measures the actual pages behind the number you just calculated.