Ad Spend Efficiency Calculator
Measure how efficiently your ad campaign performed — ROAS, ROI, cost per click (CPC), cost per 1,000 impressions (CPM), cost per acquisition (CPA), and conversion rate — from your campaign numbers.
Campaign Details
ROAS (Return on Ad Spend)
3.00x
ROI: 200.0% · Net Profit: ₹1,00,000
CPC
₹25
CPM
₹100
CTR
0.40%
CPA
₹500
Conversion Rate
5.00%
How It Works
Ad spend efficiency is measured through a family of standard marketing metrics, each answering a different question. ROAS (Return on Ad Spend) shows revenue generated per rupee spent — a ROAS of 3x means ₹3 in revenue for every ₹1 spent. ROI (Return on Investment) goes further by netting out the spend itself: ROI% = (Revenue − Spend) ÷ Spend × 100, showing the actual percentage return rather than just revenue multiple. CPC (Cost per Click) and CPM (Cost per Mille/thousand impressions) measure how expensive your reach and traffic are, useful for comparing ad platforms or creatives. CTR (Click-Through Rate) shows what fraction of people who saw your ad clicked it — a proxy for how compelling the ad/audience match is. CPA (Cost per Acquisition) and Conversion Rate measure the bottom of the funnel: how much each actual customer or lead cost, and what fraction of clicks converted. A high ROAS with a low conversion rate might mean high-value but rare conversions; comparing all these metrics together gives the full efficiency picture, not just one number in isolation.
Formula
ROAS = Revenue ÷ Spend. ROI % = (Revenue−Spend)÷Spend×100. CPC = Spend÷Clicks. CPM = Spend÷Impressions×1000. CPA = Spend÷Conversions. CTR = Clicks÷Impressions×100.
Frequently Asked Questions
What is a good ROAS?
It depends on margins: a business with 50% gross margin needs roughly 2x ROAS just to break even on the ad spend itself (before other costs). E-commerce campaigns often target 3–4x+ ROAS; the "right" number depends entirely on your margins and other costs.
What is the difference between ROAS and ROI?
ROAS is a ratio: revenue ÷ spend (e.g., 3x). ROI is a percentage that nets out the spend as a cost: (revenue − spend) ÷ spend × 100. A 3x ROAS equals 200% ROI — they describe the same result differently, and ROI makes clearer whether you actually profited.
How is CPA different from CPC?
CPC (cost per click) is what you pay for each click, regardless of what happens after. CPA (cost per acquisition/action) is what you pay for each actual conversion — a sale, signup, or lead. CPA is almost always higher than CPC because not every click converts.
What is CPM and why does it matter?
CPM = cost per 1,000 impressions — what you pay to show your ad 1,000 times, regardless of clicks. It is used to compare the raw cost of reach/visibility across platforms or placements, separate from how compelling the ad itself is.
Can I calculate this without clicks or impressions data?
Yes — ROAS and ROI only need ad spend and revenue. Clicks, impressions, and conversions are optional and unlock CPC, CPM, CTR and CPA respectively; leave any you don’t have at zero.