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Meta Ads ROI & CBO Planner

Plan your Facebook and Instagram results before you spend a dollar. Enter your budget and a few rates and see projected reach, clicks, results, cost per result and ROAS, plus a smart test-and-scale budget split.

By the Digital Success paid-media team · Updated September 2026 · Free, results in seconds

The short version: Meta results come down to CPM, click-through rate and landing conversion rate against your budget. This planner projects your reach, clicks, purchases or leads, cost per result and ROAS from those inputs, then recommends how to split the budget across testing, scaling and maintaining, the discipline that keeps a Meta account profitable as creatives fatigue.
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Plan your Meta results and budget split

Model Facebook and Instagram results from a few rates. Budget, CPM, CTR and conversion rate drive the forecast; add value and margin for ROAS and profit. All in your browser.

What you get

A realistic picture of what your Facebook and Instagram budget should produce, before you commit it. From four rates the planner projects your reach, clicks, results, cost per result and, if you add a value and margin, your ROAS and profit. Then it does the part most calculators skip: it splits your budget the way a disciplined media buyer would, a majority behind proven winners, a slice held for maintaining steady performers, and a deliberate portion reserved for testing new creative, because on Meta the account that stops testing is the account whose results quietly decay.

How it works

  1. Enter your monthly budget and expected CPM.
  2. Add your click-through rate and landing-page conversion rate.
  3. Add value per result and margin for ROAS and profit.
  4. See your funnel, your recommended test/scale/maintain split, and results across a range of budgets.

Why the split matters as much as the total

In the Advantage+ era it is tempting to hand Meta a budget and let it run. That works until it does not: the same audiences see the same ads, fatigue sets in, and cost per result climbs with no obvious cause. The fix is structural, not clever. Keeping a fixed share of budget flowing into fresh creative and new audiences feeds the algorithm what it needs to keep finding efficient results, and keeping a clear line between testing and scaling stops a promising test from being starved or a fading winner from being over-fed. This planner builds that discipline into the number from day one, so your budget is not just a total, it is a plan.

Frequently asked questions

What is a good CPM on Meta?
It varies widely by audience, placement and season, often a few dollars to the mid-teens. Use your own CPM if you have it; otherwise model a range, since CPM swings more than any other input.
What is CBO?
Campaign Budget Optimization: one budget at campaign level that Meta distributes across ad sets in real time. It works best with several strong ad sets and enough budget to exit the learning phase. This planner suggests a starting split so you scale winners without starving tests.
How much should I spend on testing?
A common starting point is about 60% on winners, 25% maintaining, 15% testing new creative and audiences. This tool turns that into dollars; refine from your results.
Why do my Meta results decay?
Creative fatigue. The same people see the same ads until performance drops. Meta rewards fresh creative, which is why the testing slice matters and why plans that ignore it stop working.
Is it free?
Yes, free with no login, calculated in your browser. Share your details once to open the full funnel, split and scenarios.
Does it work for lead gen and e-commerce?
Both. Use value per lead or per purchase as your value per result; the ROAS and cost-per-result math is the same.

Further reading from Digital Success

Want your Meta ads planned and run to a number?

A plan is the easy part; feeding Advantage+ the right creative and budget week after week is the work. Digital Success builds and manages Meta campaigns for US brands. Talk to a specialist for a free plan.

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