Facebook Ad Budget Calculator
Work backward from a revenue, lead, trial, or install target to the Facebook ad budget you actually need. Built around AOV, ROAS, CPL, CPT, and CPI — the metrics performance marketers use every day.
Updated for 2026 · Built by media buyers
Assumptions
You need
$33,333
total ad budget over 30 days to hit your goal of 1,176 orders.
Budget breakdown
Daily budget
$1,111
Cost per conversion
$28
Conversions needed
1,176
Clicks needed
49,020
Revenue target
$100,000
Target ROAS
3.0x
Heads up: your CPC and CVR assumptions imply $68,627 in click costs to hit this goal. That is 206% of your modeled budget. Either your target conversion volume needs higher budget, or the CPC and CVR estimates are too pessimistic.
How to plan a Facebook ad budget that actually hits the target
Most teams skip this step and overspend. The Facebook Ad Budget Calculator forces three things out into the open: the business outcome you actually want, the economics that make that outcome possible, and the assumptions you are betting on. If you can defend those three, the budget defends itself.
The math is straightforward. For ecommerce, the budget is the revenue target divided by the target ROAS. Everything else — conversions needed, daily pacing, click volume — falls out of that. For lead-gen and SaaS, you multiply the goal volume by the target cost per conversion. The trick is being honest about what ROAS or cost per conversion is actually achievable in your category.
The warning the calculator throws when your CPC and CVR assumptions cannot support the conversion volume is more useful than the budget number itself. It surfaces the conversation that media buyers and founders need to have before the campaign launches: which lever do we move? CPC, CVR, AOV, or the target ROAS?
Common Facebook ad budget mistakes
Budgeting on impressions instead of outcomes. Some agencies still pitch budgets by impressions or reach. That is fine for awareness work. For performance, you should always start from the outcome and back into the spend.
Underfunding the learning phase. Meta's optimization needs about 50 conversions per ad set per week to leave the learning phase. Most underperforming accounts we audit are simply too lean on daily budget for the model to learn.
One-month budgets, three-month tests. Most category-defining creative tests need 6–8 weeks to read. If your budget is a 30-day plan but your test takes 90 days, you will kill winners early.
No reserve for creative refresh. Set aside 15–20% of the monthly budget for shipping new creative. Without it, ad fatigue kills returns by week four.
Frequently asked questions
How does the Facebook Ad Budget Calculator work?
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The calculator works backward from a business goal — revenue, leads, trials, or installs — to the budget you need. For revenue, it uses your AOV and target ROAS to derive both the conversion count and the budget. For non-revenue goals, it multiplies your target conversion volume by your target cost per conversion. The result is a 30-day budget you can stage into daily pacing.
What is a good ROAS target on Facebook ads?
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Most healthy DTC brands aim for a target ROAS between 2.5x and 4x on prospecting. Anything below 2x in 2026 is usually unsustainable once you include CAC payback time. Brands with a strong subscription motion or high LTV can sustainably go below 2x because the second purchase covers the gap. For B2B SaaS, ROAS framing is less useful — use cost per qualified lead instead.
How much should I spend on Facebook ads?
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There is no universal answer, but a useful starting frame is: spend the amount of money that lets you generate 50+ purchase conversions per week. Meta's learning algorithms need that signal volume to leave the learning phase, and the data is also enough for you to actually read campaign performance. If 50 conversions per week is far beyond your current budget, run engagement or traffic objectives first and migrate to conversions once you have the data.
What is a healthy daily budget?
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Daily budgets should be at least 10x your expected cost per conversion. So if your target CPA is $50, run ad sets at $500/day minimum to give Meta enough room to optimize. Daily budgets below that level rarely exit the learning phase cleanly.
Should I budget for Facebook or for the whole Meta platform?
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Meta runs Facebook and Instagram in the same auction. Budget for the campaign and let Meta allocate placements. Forcing a manual Facebook-only setting is rarely a good idea in 2026 because most performance gains come from cross-placement creative optimization.
How is this different from the Cost Calculator?
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The Cost Calculator works forward — you input a budget and it estimates the outcomes. The Budget Calculator works backward — you input a goal and it estimates the budget. Use both: model the goal, then double-check by inverting the model with the Cost Calculator.
You have a budget. Now launch the campaign.
AdLiftr is the media buying platform that bulk launches the campaign across Meta, TikTok, and Google Ads from one workflow. 7-day free trial, no credit card required.