16 Jul Facebook vs Instagram CPM: Don’t Trust Generic Benchmarks
If you’re trying to figure out whether Facebook or Instagram gives you a cheaper CPM, the honest answer is: it depends on your account, and no generic rule reliably applies. Benchmark reports disagree with each other constantly — some show Facebook running cheaper, some show Instagram cheaper, and almost all of them agree that Instagram Reels tends to undercut both. The only number that actually matters is what your own placement breakdown shows.
This sits alongside the structural reasons your CPM runs high in general — placement is one lever you can actually pull once you know where your cost is really coming from.
Why the generic comparisons contradict each other
Search “Facebook vs Instagram CPM” and you’ll find confident claims in both directions — and both can be true at once, because they’re measuring different things. CPM varies by:
- Placement format: Feed, Stories, and Reels within the same platform can have meaningfully different CPMs from each other, sometimes more different than Facebook is from Instagram overall.
- Audience age: younger audiences skew more toward Instagram, older audiences toward Facebook, which shifts competition and pricing differently on each platform.
- Industry and vertical: a narrow B2B or finance audience behaves nothing like a broad DTC apparel audience, regardless of platform.
- Time of year: costs on both platforms move together during competitive periods, but not always by the same margin.
A benchmark published for “ecommerce brands in Q1” tells you very little about your account in a different vertical during a different season. Treating any single comparison as a rule is how advertisers end up making a placement decision that’s actually working against their own account’s data.
What to check instead
Rather than deciding upfront that one platform is cheaper, break your own results down by placement inside Ads Manager. Compare CPM and cost per result across:
- Facebook Feed
- Instagram Feed
- Reels
- Stories
Whichever placement is actually delivering your best cost per result — not the cheapest CPM in isolation — is the one worth leaning into. A lower CPM that brings in the wrong audience isn’t actually a win; cost per result is the number that reflects both delivery cost and audience quality together.
When it’s reasonable to lean toward one placement
If your own data consistently shows one placement outperforming the others over a meaningful stretch of time (not just a few days), it’s reasonable to shift more budget there. That’s a decision grounded in your account’s actual performance, not a generic industry claim about which platform is inherently cheaper. It’s also worth revisiting periodically — placement costs shift over time as Meta’s inventory and competition change, so a comparison that held six months ago may not hold today.
Most advertisers can pull this placement breakdown and read it themselves without much trouble. Where it’s harder to interpret is when the gap between placements is small and noisy, or when a “cheaper” placement is also bringing in a different quality of lead — that distinction is easier to make with a second pair of eyes on the actual numbers.
Reviews are conducted personally by Jason Gan, a Meta Certified Professional and Badged Meta Business Partner who has audited over 1,000 advertiser accounts since 2007.
Book a Meta Ads Audit — $80 / 30 Minutes →
Frequently Asked Questions
Is Facebook or Instagram CPM cheaper? It genuinely depends on your account. Benchmark data varies by source, and the pattern flips depending on placement (Feed vs. Reels vs. Stories), audience age, industry, and time of year. There’s no universal answer — the only reliable way to know for your account is to check your own placement breakdown in Ads Manager.
Should I only run Meta ads on Facebook to save money? Not automatically. While some accounts do see higher CPM on Instagram, others see the opposite, and Instagram Reels in particular often delivers some of the lowest CPM across the entire Meta ecosystem. Restricting to Facebook without checking your own data risks leaving cheaper inventory on the table.
How do I check which Meta ad placement is cheapest for my account? Break down your campaign results by placement in Ads Manager rather than relying on generic benchmarks. Compare CPM and cost per result across Facebook Feed, Instagram Feed, Reels, and Stories specifically for your account, then shift budget toward whichever placement is actually performing best for you.
If you want a real read on your placements, not a benchmark guess
Book a Meta Ads Audit — $80 / 30 Minutes →
No login required. Just a screen share, your real placement data, and a plan based on what your account is actually doing.