Advertising Metrics Calculator
Calculate CTR, CPC, CPM, CPA, conversion rate, and ROAS
Advertising Metrics Calculator — what it does
This calculator turns five raw campaign numbers — impressions, clicks, ad spend, conversions and revenue — into the six ratios media buyers actually report on: click-through rate, cost per click, cost per mille, cost per acquisition, conversion rate and return on ad spend. Every figure is derived with standard industry formulas, so results match what Google Ads, Meta Ads Manager or a spreadsheet would show for the same inputs.
When this tool helps
- Checking a platform dashboard against your own numbers when reported spend and revenue do not line up.
- Comparing two campaigns that ran at different budgets, where absolute clicks say nothing but CPC and ROAS do.
- Building a quick pre-launch model: enter a target CPA and see what conversion rate the landing page has to reach.
How to use it
- Enter impressions and clicks to get click-through rate.
- Add ad spend so CPC and CPM are calculated.
- Fill in conversions and revenue for CPA, conversion rate and ROAS.
- Press Calculate and read the metric grid below the form.
Accuracy, limits, and good practice
- CPM is cost per thousand impressions, not per impression — a common source of tenfold errors when copying numbers between reports.
- ROAS here is revenue divided by spend, expressed as a multiple. Profit-based ROAS needs your gross margin applied to revenue first.
- Attribution windows differ between platforms, so conversions pulled from two dashboards on the same date range are rarely identical.
Frequently asked questions
What counts as a good ROAS?
It depends entirely on margin. A store with 20% gross margin needs roughly 5x ROAS to break even, while a software product with 90% margin can be profitable near 1.2x.
Why is my CPA higher than CPC times clicks?
CPA divides total spend by conversions, not by clicks. If only one visitor in fifty converts, CPA is roughly fifty times CPC.
Can I leave revenue blank?
Yes. Metrics that do not depend on revenue — CTR, CPC, CPM and CPA — still calculate. Only ROAS needs a revenue figure.
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Everything above runs inside this page. Advertising Metrics Calculator needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
廣告指標計算器能做什麼
這個計算器把五個原始投放數字——曝光、點擊、廣告花費、轉換數與營收——換算成投放人員實際匯報的六項比率：點擊率、單次點擊成本、千次曝光成本、單次獲客成本、轉換率與廣告投報率。所有數值都以業界標準公式推導，相同輸入下結果會與 Google Ads、Meta 廣告管理員或試算表一致。
什麼時候用得上
- 平台後台的花費與營收兜不攏時，用自己的數字核對一次。
- 比較兩檔預算不同的廣告：絕對點擊數沒有意義，CPC 與 ROAS 才有。
- 投放前先做粗估：填入目標 CPA，反推到達頁需要多高的轉換率。
使用步驟
- 輸入曝光數與點擊數，取得點擊率。
- 填入廣告花費，計算 CPC 與 CPM。
- 補上轉換數與營收，取得 CPA、轉換率與 ROAS。
- 按下計算，於表單下方的指標區看結果。
精確度、限制與實務建議
- CPM 是「每千次曝光」成本而非每次曝光，跨報表抄數字時最容易差十倍。
- 此處的 ROAS 為營收除以花費的倍數；若要看利潤型 ROAS，需先把毛利率套用到營收上。
- 各平台歸因期間不同，同一日期區間從兩個後台拉出的轉換數幾乎不會相等。
常見問題
ROAS 多少才算好？
完全取決於毛利。毛利 20% 的電商大約要 5 倍 ROAS 才打平；毛利 90% 的軟體產品在 1.2 倍附近就可能獲利。
為什麼 CPA 比 CPC 高很多？
CPA 是總花費除以轉換數，而不是除以點擊數。若五十位訪客才有一位轉換，CPA 約為 CPC 的五十倍。
營收可以留空嗎？
可以。CTR、CPC、CPM 與 CPA 不需要營收仍會計算，只有 ROAS 一定要填營收。
本站相關工具
以上步驟全部在這個頁面內完成，廣告指標計算器 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。