Plan daily and monthly ad spend from target orders, expected CPA and your break-even economics — without assuming one universal Meta, TikTok or Google Ads budget.
Use the maximum CPA from the Break-even ROAS calculator.
Optional profit-preserving CPA target.
A simple testing reference: expected CPA × chosen multiple. This is not a platform rule.
The calculator above turns a target order volume into a daily and monthly media budget. Enter the number of orders you want per day, the number of active advertising days, average order value, expected CPA, break-even CPA and the lower CPA that would preserve your desired profit. The sticky results card then shows the daily budget, monthly spend, expected ROAS, break-even ROAS, target ROAS, projected revenue and the remaining CPA headroom. This is more useful than choosing an arbitrary daily budget because it links spending capacity to the economics of one acquired order.
Break-even CPA should come from a separate unit-economics calculation that includes product cost, fulfillment, marketplace or payment fees, returns and other variable expenses. It is not the same as your current CPA. The current CPA describes campaign performance; break-even CPA describes the maximum the order can support.
If average order value is $40 and the modeled break-even CPA is $20, break-even ROAS is 2.00×. A campaign producing a $10 CPA would imply 4.00× ROAS and $10 of acquisition-cost headroom per order before fixed overhead. The calculator does not assume that all of that headroom becomes accounting profit; it only shows the relationship between the CPA limits you provide and the media budget needed to hit an order target.
Assume a $39.99 average order value, expected CPA of $8, break-even CPA of $19.83 and profit-preserving target CPA of $11.83. Ten orders per day require about $80 in daily spend. Over 30 advertising days, that becomes $2,400 in media spend and 300 modeled orders. Expected revenue is about $11,997. Expected ROAS is roughly 5.00×, while break-even ROAS is about 2.02×. CPA headroom is $11.83 per order because the expected $8 CPA remains below the $19.83 break-even limit.
| Planning input | Example | What it controls |
|---|---|---|
| Expected CPA | $8.00 | Spend required for the planned order volume |
| Break-even CPA | $19.83 | Maximum modeled acquisition cost before order profit reaches zero |
| Target CPA | $11.83 | Stricter acquisition limit used to preserve a chosen profit cushion |
| CPA test multiple | 3× | Simple reference for a test-day spend amount, not a platform rule |
Do not increase spend solely because expected CPA is below break-even. Watch conversion quality, attribution delay, refunds, inventory and cash flow. A budget is financially supportable only if the underlying order economics remain valid as campaign mix and customer behavior change.
Multiply the number of orders you want per day by the expected cost per acquisition. Ten orders per day at an $8 CPA requires about $80 per day in ad spend.
Break-even CPA is the maximum acquisition cost the modeled order can absorb before profit reaches approximately zero. Expected CPA below that threshold leaves contribution after ads; expected CPA above it does not.
Yes. The calculator is channel-neutral. Enter the CPA, order volume and average order value that apply to the campaign you are evaluating.
No. The CPA-multiple output is only a planning reference. Conversion volume, attribution delay, campaign learning and auction volatility differ by platform and product.
This tool uses user-entered planning assumptions rather than a platform-specific fee schedule. See the Break-even ROAS Calculator and our calculation methodology.