BYTETOOLS

ROAS Calculator

Calculate ROAS, ACOS, break-even ROAS and the maximum CPA your margin supports, plus profit after ad spend. Free, instant and fully browser-based.

4.50x
ROAS
450%
ROAS as a %
22.22%
ACOS
2.22x
Break-even ROAS
$10,125
Gross profit
$5,125
Profit after ad spend
2.02x
POAS (profit on ad spend)
22.78%
Net margin after ads
$90.00
Average order value
$20.00
Actual CPA
$40.50
Max CPA the margin supports
+2.28x
ROAS headroom vs break-even

Comfortably profitable — 4.50x against a 2.22x break-even. There is room to bid harder and buy more volume.

ROAS = revenue ÷ ad spend  ·  ACOS = ad spend ÷ revenue  ·  break-even ROAS = 1 ÷ gross margin  ·  max CPA = AOV × gross margin

Worked example: $5,000 of spend returning $22,500 is a 4.50x ROAS and a 22.22% ACOS. At 45% gross margin you need 1 ÷ 0.45 = 2.22x just to break even, so the campaign clears it and leaves $5,125 of profit after ad costs. Across 250 orders the AOV is $90.00 and the most you can pay per order is 90 × 0.45 = $40.50.

Break-even ROAS is the number that matters, not ROAS itself: a 3x return is excellent on a 70% margin and loss-making on a 25% one. This tool measures a single campaign period on last-click revenue and ignores returns, repeat purchases and lifetime value, all of which can move the real answer a long way in either direction. Figures are calculated in your browser and never uploaded.

What is the ROAS Calculator?

Return on ad spend is easy to calculate and easy to misread. A 3x ROAS is excellent on a 70% gross margin and loss-making on a 25% one, which is why this calculator always shows your break-even ROAS — one divided by your gross margin — right next to the headline figure.

  • ROAS as a multiple and a percentage, with ACOS alongside
  • Break-even ROAS calculated from your gross margin
  • Profit after ad spend, POAS and net margin after advertising
  • Average order value, actual CPA and the maximum CPA your margin supports
  • Colour-coded verdict showing headroom above or below break-even
  • Runs offline in your browser — campaign figures are never uploaded

How to use the ROAS Calculator

  1. 1

    Choose a currency and enter the ad spend for the campaign or period.

  2. 2

    Enter the revenue you attribute to that spend.

  3. 3

    Set your gross margin — revenue left after product cost, shipping and fees.

  4. 4

    Optionally add the order or conversion count to unlock AOV and cost per acquisition.

  5. 5

    Compare ROAS against the break-even ROAS and read the verdict below the stats.

About the ROAS Calculator

Return on ad spend is easy to calculate and easy to misread. A 3x ROAS is excellent on a 70% gross margin and loss-making on a 25% one, which is why this calculator always shows your break-even ROAS — one divided by your gross margin — right next to the headline figure.

From the same four inputs it derives the numbers you actually make decisions with: profit after ad spend, POAS, ACOS for marketplace reporting, your real cost per acquisition, and the maximum CPA your margin can support before a campaign starts losing money. The verdict line tells you plainly whether you are above or below water.

Everything is computed in your browser as you type, with the verdict recolouring the moment a campaign crosses or falls below break-even. Spend, revenue, margin and order counts are never uploaded, so you can paste in real campaign numbers from your ad account without any of them leaving your device or being stored anywhere.

Frequently asked questions

What is a good ROAS?

It depends entirely on your margin. Break-even ROAS is one divided by your gross margin, so a business on a 45% margin needs about 2.22x just to stand still, while a 70% margin business breaks even at 1.43x. Anything comfortably above your own break-even is good; a headline number without a margin attached means nothing.

What is the difference between ROAS and ACOS?

They are reciprocals. ROAS is revenue divided by ad spend, expressed as a multiple; ACOS is ad spend divided by revenue, expressed as a percentage. A 5x ROAS is a 20% ACOS. Amazon sellers tend to use ACOS, while Google and Meta advertisers use ROAS.

How do I calculate break-even ROAS?

Divide one by your gross margin expressed as a decimal. At a 40% margin that is 1 ÷ 0.4 = 2.5x, meaning every pound of ad spend must return two pounds fifty in revenue before the campaign contributes any profit at all.

What is POAS and why does it matter?

Profit on ad spend divides gross profit, rather than revenue, by ad spend. It answers the question ROAS cannot: whether the campaign made money. Two campaigns with identical ROAS can have very different POAS if they sell products with different margins.

Does ROAS account for returns and repeat purchases?

No, and that is its biggest weakness. This calculator measures a single period on the revenue you attribute to it, ignoring refunds, returns and everything a customer buys later. If your repeat rate is high, ROAS understates the true return; if returns are common, it overstates it.

Related tools