Skip to content

ACoS / ROAS Calculator

In one line: Decide instantly whether your ad spend is making money — compare your ACoS against the break-even point and get a target bid.

When to use

  • Reviewing whether a PPC campaign is actually profitable
  • Setting a target ACoS before scaling ad budget
  • Estimating a starting bid for a new keyword or product

Inputs

Field Notes
Ad spend Total spend on the campaign or keyword for the period
Ad-driven sales Revenue attributed to those ads (not total store revenue)
Profit margin Per-unit margin before ads, used to derive break-even ACoS

Outputs

  • ACoS % — ad spend ÷ ad-driven sales
  • ROAS — ad-driven sales ÷ ad spend
  • Break-even ACoS — the ACoS at which ads neither make nor lose money
  • Suggested target bid — a starting bid aligned to your target ACoS

Steps

  1. Open https://www.niceggie.com/tools/acos-calculator
  2. Enter ad spend, ad-driven sales, and your profit margin
  3. ACoS, ROAS, and break-even ACoS update instantly
  4. Use the suggested target bid as a starting point and refine with live data

Break-even ACoS equals your profit margin

If your pre-ad profit margin is 30%, your break-even ACoS is 30% — spend more than that on ads and the order loses money. To grow profitably, keep target ACoS comfortably below the break-even line (e.g. 20% against a 30% margin) so ads still leave room for profit.

FAQ

What's the difference between ACoS and ROAS?

They are inverses of the same data. ACoS is a percentage (spend as a share of sales) — lower is better. ROAS is a ratio (sales returned per dollar spent) — higher is better. ACoS 25% equals a ROAS of 4.0. Use whichever your platform reports natively.

Should I always aim for the lowest possible ACoS?

No. A very low ACoS usually means underbidding and lost volume. During a launch you may run ACoS above break-even on purpose to win rank and reviews, then tighten it later. Optimize for total profit, not for ACoS alone.

Pair with