The internet's favorite claim about Microsoft Ads is that it runs some fixed multiple cheaper than Google Ads. Three times cheaper shows up constantly, on agency blogs, on forums, even on pages of ours. I run both platforms for the same accounts, so before writing this I pulled 90 days of live campaign data instead of repeating the number. The gap is real. It is not a fixed multiple, and on part of the account I checked, Microsoft Ads was the more expensive platform.
The head-to-head reality
I compared one B2B account (a conveyor-systems manufacturer, anonymized) running near-identical campaign structures on both platforms over the same 90-day window: matched conversion-goal tracking, automated bidding on both sides, the same lead form counted the same way in HubSpot regardless of which platform sent the click.
Cost per lead, expressed as a ratio because the absolute numbers aren't mine to publish:
| Campaign segment | Microsoft Ads CPL vs. Google Ads |
|---|---|
| Branded search | About 9% lower |
| Best-matched non-brand tier | About 14% lower |
| Blended across every non-brand tier running on Microsoft Ads | About 14% higher |
That last row is the one the "3x cheaper" folklore leaves out. On the single tightest-matched audience segment, Microsoft Ads won. Expand out to the full set of non-brand tiers this account runs on Microsoft Ads, including the broader industrial segments it reaches for volume, and the blended number crosses back over to Google's side. This is observed, from one account, one window. It is not a claim about every account, and I'm not going to pretend it is.
Why the gap moves: Microsoft Advertising has a fraction of Google's search volume (more on that below), so once a campaign needs more volume than the tightest keyword tier can supply, it has to reach into broader, lower-intent targeting to find it. Fewer competing bidders keeps the cost-per-click low on Microsoft Ads, but the platform also has less signal to work with in that broader traffic, and conversion rate can drop faster than CPC does. Google has enough volume to stay inside a well-matched audience longer before it has to make that same trade. That's inference on top of the observed numbers above, not a second measured fact, but it's the mechanism that fits what the data shows.
The takeaway isn't "run Microsoft Ads" or "skip it." It's that the CPL comparison depends entirely on which slice of the account you're looking at, and anyone quoting a single multiplier, including a page on our own site, is oversimplifying.
Microsoft Ads vs. Google Ads at a glance
For anyone comparing the platforms on fundamentals rather than one account's cost data:
| Google Ads | Microsoft Advertising | |
|---|---|---|
| Global search market share | About 91% (Statcounter, July 2026) | About 4.5% (Statcounter, July 2026) |
| Network reach | Display Network reaches over 90% of internet users worldwide across more than 2 million sites; Demand Gen reaches more than 3 billion monthly active users across YouTube, Discover, Gmail and Maps (Google Ads Help) | About 1 billion users across Bing, Edge, Outlook and MSN plus syndication partners like Yahoo (Microsoft Advertising) |
| AI-automated campaign type | Performance Max | Performance Max (launched 2023, rolled out globally March 2024) |
| Distinctive targeting | The broadest first-party and in-market signal set of any ad platform | LinkedIn profile targeting: bids adjusted by a searcher's company, industry and job function pulled from LinkedIn data. Microsoft states it is "the only advertising platform (other than LinkedIn)" that can do this, and notes it is bid-only, so it raises or lowers bids rather than narrowing who sees the ad |
| Reporting and integrations | The deepest native attribution tooling and the largest third-party integration ecosystem | Solid native reporting; a smaller integration ecosystem than Google's |
| Typical bidder density | Higher. More advertisers compete for the same query | Usually lower, which is the platform's real structural advantage, but not a fixed cost multiple (see above) |
Is Microsoft Ads worth it?
For most B2B accounts already running Google Ads well, yes, worth testing. The reason isn't a guaranteed cheaper CPL. It's that Microsoft Ads reaches a real, separate audience: LinkedIn-informed B2B targeting Google doesn't offer, Bing and Edge's older, more transaction-ready demographic, and a bidder pool thin enough that a well-built branded and best-matched non-brand campaign can genuinely outperform Google on those specific segments. Where it stops being worth it is treating it as a copy-paste of the Google account and expecting the same multiplier everywhere. Build it as its own account with its own tiering, watch where the blended cost crosses over, and cut back the segments that don't hold up. That's the difference between the folklore version and what actually happens when you run the account.
What about CPC?
"Microsoft Advertising CPC vs Google Ads" isn't quite the right question. Lower CPC on Microsoft Ads is close to a given, since bidder density is lower on most queries. What determines whether that turns into a cheaper lead is conversion rate, and conversion rate is where the platforms diverge unpredictably by segment, as the table above shows. A campaign can have a lower CPC on Microsoft Ads and a higher cost per lead than the Google campaign sitting next to it, because the traffic converts at a lower rate. CPC alone tells you less than it looks like it does. CPL, measured on matched segments over a real window, is the number that means anything.
Running both on the same account
The two platforms aren't interchangeable, and they don't need identical structures to both work. Import your Google Ads structure as a starting point rather than building from scratch. I've written through that process, keyword matching quirks and all, in how to import Google Ads to Bing. From there, treat Microsoft Ads as its own account: tier it, watch the blended CPL by tier the way I did above, and don't assume a number that held on one segment holds on all of them.
If you're weighing whether the platform split is worth the management overhead at all, that's part of what we build out in paid media management for manufacturers, and the broader B2B PPC groundwork is in B2B PPC for effective lead generation.
The honest answer to "which platform is cheaper" is: it depends on which part of the account you're asking about, and anyone who gives you one number for the whole thing hasn't looked closely enough.
