Free Marketing & Seller Fee Calculators

Which calculator do you need?

Pick the question that sounds most like yours.

• “Are my ads paying off?” Use the ROAS calculator. It shows how much revenue each ad dollar brings back, and the break-even point you need to beat.
• “Why are my ads so expensive?” Check your CPM and your CTR. One shows what you pay to be seen, the other shows how many people click.
• “What does one sale cost me?” Use the CPA calculator.
• “What does a whole customer cost me?” Use the CAC calculator. It counts sales and software costs, not just ad spend.
• “How much will Stripe take?” Use the Stripe fee calculator.
• “How much will PayPal take?” Use the PayPal fee calculator.

Marketing calculators

Ad and marketing metrics that follow your campaign from impressions to customers. See all marketing calculators.

Fee calculators

See what payment platforms really take, what lands in your account, and what to charge to receive a set amount. See all fee calculators.

The five ad metrics in plain words

• CPM (cost per mille) is what you pay for every 1,000 times your ad is shown. Divide the cost by impressions, then multiply by 1,000.
• CTR (click-through rate) is the share of people who saw your ad and clicked it. Divide clicks by impressions.
• CPA (cost per acquisition) is what you pay in ad spend for one conversion, such as a sale or a sign-up. Divide ad spend by conversions.
• CAC (customer acquisition cost) is what it costs to win one new customer, counting sales and marketing costs together. Divide those total costs by the number of new customers. Companies draw the line in slightly different places, so each calculator and guide here spells out what it includes.
• ROAS (return on ad spend) is the revenue your ads bring back for each dollar spent. Divide ad revenue by ad spend.

One more number matters more than any benchmark: your break-even ROAS. It is 1 divided by your profit margin. At a 40% margin it is 2.5, and a campaign below that loses money on every sale even if the ROAS looks decent.

One example, start to finish

These metrics are links in a single chain, and it is easier to see when the same numbers run through all of them. Say a store spends $1,000 on ads.

The ads get 100,000 views and 1,000 clicks. 25 people buy, and together they spend $2,500.

Now the check. Suppose the store keeps a 40% margin. Break-even ROAS is 1 ÷ 0.40 = 2.5, so this campaign is exactly at break-even. Each $100 order leaves $40 of margin, and each sale cost $40 to win. The store covers its ad bill and earns nothing on top of it.

That is useful, because it tells you where to push. You can pay less to be seen (lower CPM), earn more clicks (higher CTR), or turn more clicks into buyers with a better page. Each calculator lets you change one number and see what happens to the result.

CAC goes one step further. If those 25 buyers are all new customers and the store spent another $500 that month on tools and freelancers, CAC is ($1,000 + $500) ÷ 25 = $60, which is $20 higher than the CPA. That is the number to compare with what a customer is worth over time.

These figures are made up to show the method. They are not benchmarks. For real platform numbers, see our guides below.

What payment platforms really take

Most payment platforms charge a percentage plus a fixed amount per payment. The fixed part hurts small sales the most, so a fee that sounds small can take a real share of a $10 sale.

These are US rates, checked in October 2026. Here is what each platform takes from a $100 sale.

Both platforms have other rates for other payment types, and extras like international cards, currency conversion and disputes cost more. Check each platform’s own pricing page before you set a price, starting with Stripe’s pricing page.

The fee calculators do three jobs:

• They show the fee on a payment.
• They show what you receive after it.
• They work backwards: the price you need to charge to receive an exact amount. With Stripe’s standard rate, receiving $100 takes a charge of $103.30.

Latest guides

• YouTube CPM vs RPM: why you earn less than the CPM you see, with worked examples.
• What Are Stripe Fees? What You Actually Pay on $10,000 in Sales: a 200-order month line by line, plus the extras people forget.
• CAC Formula: Why Your Number Is Probably Too Low: the costs most people leave out, and how to set a target.
• What Is a Good CTR?: real numbers for Meta, Google, YouTube and TikTok.
• How to Calculate CPA: the formula, worked examples and benchmarks.
• Average CPM by Platform: what Meta, TikTok, YouTube and others charge.
• What Is a Good ROAS?: benchmarks by platform and industry.

Frequently asked questions