# CPA calculator: what one conversion costs in ad spend > Enter ad spend and conversions for your cost per acquisition, and a target CPA for the conversion rate it needs, free with no sign-up. - Page title: CPA calculator: find your cost per acquisition | Spytrend - Page description: Free CPA calculator: enter ad spend and conversions to get cost per acquisition. Add clicks and a target CPA to see the conversion rate you need. No sign-up. - Tool: https://spytrend.com/cpa-calculator - Embeddable version: https://spytrend.com/cpa-calculator/embed - All free tools: https://spytrend.com/tools - The product behind it: https://spytrend.com/?utm_source=tools&utm_medium=free_tool&utm_campaign=cpa-calculator To calculate CPA, divide your ad spend by the conversions it bought over the same dates. $4,800 of spend and 96 purchases is a $50 cost per acquisition. Add your clicks and the calculator also shows your conversion rate; add a target CPA and it shows the conversion rate that target needs. The first card shows what each conversion cost. Add clicks and a target CPA, and the second card shows the conversion rate that target needs. ## Your cost per acquisition, and the conversion rate behind it Cost per acquisition decides whether a campaign can take more budget. This page does that one division next to the figures you are weighing, and updates as you type. What comes out: - **Cost per acquisition.** Ad spend divided by conversions, recalculated as you type. - **The conversion rate behind it.** Add your clicks and the card shows the rate you convert at. CPA is your cost per click divided by that rate. - **The rate a target needs.** Type the CPA you are aiming for, and the second card shows the conversion rate it takes at this spend and these clicks, next to the rate you have now. This is the ad-platform CPA: the spend your account recorded, divided by the conversions it counted. It is not your customer acquisition cost. The page divides the two figures you type, so the answer is only as good as the conversions your ad platform reports. ## CPA calculator: three steps 1. **Enter your ad spend** Type what the campaign spent over the dates you care about. You can paste it from Ads Manager: 4,800 and $4,800.00 read the same. 2. **Enter the conversions** Type the purchases, leads or sign-ups that spend bought over the same dates. Whatever your account counts as a conversion is what the CPA means. 3. **Add clicks or a target** Clicks add your conversion rate. A target CPA adds the rate you would need. Leave both empty for the cost per acquisition alone. Use the same dates for both numbers. Spend from 30 days divided by conversions from 7 gives a CPA about four times too high. ## Free version limits The calculator runs in your browser; there is no limit and no account. We don’t store your numbers. ## CPA formula: ad spend divided by conversions CPA = ad spend ÷ conversions. A campaign that spent $4,800 and got 96 purchases paid $50 in ad spend for each one. Spend is what the account was charged; a conversion is whatever event the account optimizes for. Through clicks, CPA is cost per click divided by conversion rate. You don’t control auction prices, but you do control the conversion rate, through the copy, the offer and the page. Lift it from 3% to 4% on the same spend and clicks, and every customer costs a quarter less. ### A worked example: $4,800 on Meta over 30 days | Figure | Working | Result | | -------------------- | --------------------------------------------- | --------- | | Ad spend | What the account was charged over the window | $4,800 | | Conversions | Purchases the account attributed to those ads | 96 orders | | Cost per acquisition | 4,800 ÷ 96 | $50.00 | | Link clicks | Clicks over the same 30 days | 3,200 | | Conversion rate | 96 ÷ 3,200 | 3.0% | | Cost per click | 4,800 ÷ 3,200 | $1.50 | ### Same $4,800, same 3,200 clicks | Conversion rate | Conversions | Cost per acquisition | | --------------- | ----------- | -------------------- | | 2.0% | 64 | $75.00 | | 3.0% | 96 | $50.00 | | 4.0% | 128 | $37.50 | | 5.0% | 160 | $30.00 | ## CPA, CPL and CAC are three different numbers CPA is an ad-platform metric: one campaign, one date range, one conversion event. CAC is a business metric: everything sales and marketing cost, divided by the customers you won. CPL is CPA with a lead as the conversion, so a $50 CPL at a 30% close rate is a $167 cost per customer. ### What each one counts | Metric | What it counts | Where the number comes from | | ------------------------------- | -------------------------------------------------------------------------- | ----------------------------------------------------------------- | | CPA — cost per acquisition | Ad spend divided by the conversions the platform attributed to it | Ads Manager, or the calculator above | | CPL — cost per lead | The same division, where the conversion event is a lead rather than a sale | Ads Manager, with a lead set as the optimization event | | CAC — customer acquisition cost | Everything sales and marketing cost, divided by the new customers won | Your own accounts: media, salaries, tools, agency fees, discounts | ## A good CPA comes out of your margin, not out of a competitor A good CPA is one your margin can pay for. An $80 average order at a 60% gross margin leaves $48, so $48 is the ceiling if a buyer orders once. If the average customer orders 1.8 times a year, the same margin is worth about $86, and a $60 CPA pays back from the second order. A competitor’s CPA is no use as a target: you can’t see their margin, their repeat rate or how long they can wait for payback. Put your own ceiling in the Target CPA field. If the rate it needs is far from yours, fix the offer and the landing page, not the bid. ## Know the conversion rate your target needs — before you raise the budget Before a budget goes up, the target field shows whether the campaign can get there. A media buyer enters the CPA the business can afford and reads the conversion rate it takes. The gap to the current rate says whether next week’s work goes into the bid or the landing page. A founder runs it before launch: the margin sets the ceiling, and the question becomes what conversion rate paid traffic has to reach. An agency uses the same gap when a client’s CPA climbs: the cost per click held, the rate slipped, and here is the rate that brings the target back. What your own numbers can’t show is why a competitor clears a ceiling you can’t. That answer sits in their ads, in the angles they have kept running for months. ## The angles your competitors keep funding, beside your CPA ceiling Your CPA ceiling says what a customer may cost; the ads your competitors keep running show which promises win customers at that price. Spytrend is an ad intelligence platform for Facebook and TikTok advertising: a full five-year archive of ads, AI-classified into 33 business categories, with every advertiser assembled into a single card — all ads, pages, domains and countries in one place. ### Two jobs where one CPA is not enough - **Finding a better conversion rate.** When the target needs a rate you don’t have, the gap usually sits before the click: the promise, the offer, the audience. Filter a competitor’s ads to those that have run 60 days or more, and study the promises they kept funding before you rewrite your page. - **Sizing a market before launch.** Before launch there is no spend to divide. Search the brands you would compete with and see how long their ads run: months suggest someone makes the numbers work; weeks are a warning. ### From one CPA to the ads that clear it, in three steps - **Search your market.** Type a competitor’s brand or domain into the ads search. - **Keep the long runs.** Set the days filter to 60 or more: what stays is what advertisers kept funding for two months. - **Test the angle here.** Build on the angle that fits your margin, then put the new conversion rate back into this calculator. ### How to start [Create a free account](https://spytrend.com/register?source=tools&returnTo=%2Fads%3Fdays_active_from%3D60%26from%3Dtools&utm_source=tools&utm_medium=free_tool&utm_campaign=cpa-calculator) and search a brand or a domain you compete with. A free account opens the ad library; paid plans add fresh ads and every filter. ## FAQ - **How do I calculate CPA?** Divide your ad spend by the conversions it bought over the same dates. $4,800 of spend and 96 purchases is a $50 cost per acquisition. The calculator above does it as you type. - **What is a good CPA?** One comfortably below the profit a customer brings you. There is no industry figure: work it out from your own margin and repeat rate. A competitor’s CPA tells you nothing, because you can’t see the margin behind it. - **What is the difference between CPA and CAC?** CPA is the ad-platform number: spend divided by the conversions the platform attributed. CAC is the business number: all sales and marketing costs, including salaries, fees, refunds and discounts, divided by the customers you won. CAC is usually the larger of the two, and your margin has to cover it. - **What conversion rate do I need to hit a target CPA?** Divide your spend by the target CPA to get the conversions you need, then divide by your clicks. At $4,800 and 3,200 clicks, a $35 target needs about 137 conversions: a 4.3% conversion rate. Enter the target above and the calculator does it for you. - **Which currency does it use?** Whichever you pick at the top of the calculator: US, Canadian or Australian dollars, euros or pounds. It changes the symbol only, and nothing is converted, so enter the spend in the currency you want the answer in. - **Do you store the numbers I type?** No. The calculation runs in your browser; we don’t store your numbers. - **Why does my Ads Manager CPA differ from my store’s?** Because they count different things. An ad platform can count view-through and modeled conversions and match a sale to an ad seen on another device; your store counts only the orders it received. So the platform usually reports more conversions and a lower CPA. ## Your ceiling is set. See which angles clear it. Your CPA says what you can afford per sale. Spytrend shows which ads have stayed on long enough to suggest they pay their way, with launch dates and countries attached. [Open Spytrend](https://spytrend.com/register?source=tools&returnTo=%2Fads%3Fdays_active_from%3D60%26from%3Dtools&utm_source=tools&utm_medium=free_tool&utm_campaign=cpa-calculator) ## Related tools - [ROAS calculator](https://spytrend.com/roas-calculator): Enter revenue and ad spend to get ROAS and ROI. Add your gross margin to see the break-even ROAS you have to beat. - [Profit margin calculator](https://spytrend.com/profit-margin-calculator): Enter a price and a unit cost to get the gross margin, the markup and the profit on each unit. - [Break-even calculator](https://spytrend.com/break-even-calculator): Enter fixed costs, price and unit cost to see how many units you must sell, your break-even ROAS and the most an order can cost. - [eBay fee calculator](https://spytrend.com/ebay-fee-calculator): See what an eBay sale leaves you after the final value fee, the per-order fee and your own costs, at eBay’s US rates. - [Facebook ad run time](https://spytrend.com/facebook-ad-run-time): Paste an Ad Library link or an ad ID and see when the ad started, how many days it has run and whether it is still running. [All free tools](https://spytrend.com/tools) ## Embed this tool on your site Add this calculator to your own page. Paste the code below into your HTML; it works on any site and needs no account. ```html ``` The calculation runs in your browser; we don’t store your numbers. The figure is the ad-platform CPA — ad spend divided by reported conversions — not your full customer acquisition cost.