Paid ads planning tool

Ecommerce Ad Budget Calculator

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.

Budget from economics, not guesswork: enter the CPA you expect, your maximum break-even CPA, and the order volume you want. The calculator shows how much ad spend the plan requires and whether that acquisition cost is inside your modeled limit.

Ad Plan Inputs

⚡ Real-time update
$
$
Profitability Guardrails
$

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.

Daily Ad Budget
$0.00
Monthly Budget
$0
Expected ROAS
0.00×
Monthly Orders
0
Projected Revenue:$0.00
Break-even ROAS:0.00×
Target ROAS:
CPA Headroom vs Break-even:$0.00
Test Budget Reference: $0/day
Planning estimate. Actual delivery, attribution, conversion rate and CPA can vary by channel, creative, audience and season.
Quick formulas
Daily budget = target daily orders × expected CPA
Monthly budget = daily budget × days
Expected ROAS = average order value ÷ expected CPA
Calculate break-even CPA & ROAS →

How the Ad Budget Calculator Works

The calculator starts with the number of paid orders you want and multiplies that by your expected cost per acquisition. It then compares the expected CPA with your break-even and profit-preserving CPA limits.

Budget and Profitability Are Different Questions

A campaign can technically spend the requested budget and still be economically weak. That is why the calculator shows both the spend required for your order target and whether your expected CPA is below the maximum CPA your product can support.

Use CPA Multiples as a Testing Reference, Not a Rule

The test-budget reference multiplies expected CPA by a user-selected number of conversions. It is simply a planning shortcut for estimating how much daily budget might allow several conversion opportunities. It is not an optimization rule from Meta, TikTok or Google.

Example: 10 target orders per day at an $8 expected CPA requires about $80/day, or $2,400 over 30 days. If average order value is $39.99, expected ROAS is about 5.00×.

Frequently Asked Questions

Should I start with the full calculated monthly budget?

Not necessarily. The monthly figure shows what the target order volume would require if CPA stayed near your assumption. New campaigns are usually tested and adjusted as real performance data arrives.

What if expected CPA is above break-even CPA?

Then the modeled paid order loses money before overhead. Improve acquisition efficiency, increase price, or reduce non-ad costs before scaling.

Can this calculate a TikTok or Facebook ad budget?

Yes. It is platform-neutral. Use the expected CPA and economics for the channel you want to evaluate.

Why use target CPA as well as break-even CPA?

Break-even CPA leaves approximately zero modeled profit. A lower target CPA can preserve a desired profit margin and gives you a more useful scaling threshold.