The calculator runs the same bidding engine GROW uses to set live per-product bids on Google Shopping — the results match the platform's MarginStack calculations exactly.

Free ROAS Calculator

gROAS by GROW

Calculate the exact ROAS required to generate profit.
Create a free account and add to Chrome to get 20x as many products to track.

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Don't use Chrome? Create an account to use our free in-app calculator.

Free ROAS / COGS+ Calculator

Revenue from ads

Ad spend

ROAS—

As a percentage—

Ad cost per £1—

ROAS = revenue ÷ ad spend. Runs in your browser — free, unlimited. Remember: this is revenue, not profit — switch to Precision COGS+ for the ROAS you need to stay profitable.

Products (0 of 5)

Add your selling price and costs, then press calculate.

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Track more products
Advanced fields
LTV tracking

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Selling price (inc VAT)

VAT rate

Product cost (COGS)

Does your conversion tracking tag include VAT revenue?

COGS+ — Track every cost to calculate the exact bid you need

Shipping you pay

Payment fee

Payment fee (fixed)

Fulfilment

Import duties

Other fees

Return rate

Cost per return

Profit target

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74 million products in over 31 countries are powered by GROW

How it works

Three steps to the exact ROAS you need — free.

Get the calculator

We recommend creating a free account to track up to 100 products

Scan your product

Visit your product page
Open the Chrome extension
Scan the page for prices
or
Copy the URL into our in-app calculator

Enter costs & calculate

Enter your costs
Press calculate, see:

COGS COGS+ CAC ROAS break-even ROAS with profit Profit per sale

✦

More sales,
more revenue

Want to automate precision ROAS bids & scale-up? See how GROW can automate precision bidding & build smarter Google Shopping campaigns faster than competitors — to reduce ad costs and improve profitability.

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The ROAS formula

ROAS (return on ad spend) = revenue from ads ÷ ad spend. Spend 2,500 and generate 10,000 in sales and your ROAS is 4x — every 1.00 of ad spend brought back 4.00 in revenue. Google Ads shows the same number as a percentage: 400%.

Try it here:

Revenue from ads

Ad spend

Your ROAS—

That number tells you what happened. The question that decides whether you make money is the reverse one — what ROAS do you need? — and to answer it you have to know exactly what each sale can afford to spend on ads.

The calculation that matters runs backwards

Target ROAS = the revenue Google tracks ÷ the ad spend one sale can afford. The second half of that division is built from your costs — which is exactly what the precision calculator above works out.

What the calculator works out

The Precision COGS+ tab runs the full calculation, the same way GROW prices live bids:

Revenue basis. Your selling price, ex-VAT where VAT applies — VAT is a pass-through, so profit maths never include it. It also accounts for whether your conversion tag reports VAT-inclusive revenue, so the target matches what Google actually measures.
COGS+ — your true cost per sale. Product cost plus shipping, payment fees, fulfilment, duties and expected returns. This is the number most sellers underestimate, and the reason a "profitable" ROAS often isn't.
Allowable ad spend. What's left of each sale after COGS+ and the profit you want to keep — the most a sale can cost to win before it stops being worth winning.

From those three inputs it returns:

Break-even ROAS — below this line, every sale loses money.
Target ROAS — the number that protects your profit goal, with the exact percentage to enter in Google Ads (4.05x = 405%).
Profit per sale and real margin — what you actually keep after every cost.
Max cost per sale (CAC) — your ceiling for acquiring one customer.

Same engine as our live bidding

This page runs the exact bidding engine GROW uses to set live per-product bids on Google Shopping — results here match the platform's MarginStack™ calculations to the penny. For the full theory behind the numbers, read the complete guide to ROAS.

Google Shopping

Automate your ROAS & GROW Your Sales

GROW automates precision ROAS bidding for every product and builds smarter Google Shopping campaigns faster than competitors — to reduce ad costs and improve profitability.

Profit agent

Bids that protect your margin

Set the profit you want per sale; the Profit agent back-solves a precision bid for every product from its true unit economics — and re-solves through the night.

Calculate bids per product
Back-solved from true costs
Re-solved while you sleep

Profit target → bids

Auto updates on

0%10%50%

ProductMarginProfit goalBid / click

Solid Oak Dining Table27%10%Bid agent…£0.42 → £0.51 ↑

🛋️Velvet Corner Sofa31%10%Bid agent…£0.66 → £0.58 ↓

🛏️King Size Bed Frame24%10%Bid agent…£0.31 → £0.38 ↑

AIProfit agent — overnight run completeEvery bid re-solved from true costs, back on your 10% profit target before 6am.1,482bids re-solved

Build smarter campaigns

Build precision, profit-first campaigns in three simple steps. GROW simplifies campaign setup and management — every campaign is structured to unlock the full power of Google’s Smart Bidding, with a precision, profit-based bid for every product to maximise your return and give you the leverage to grow revenue.

oak dining table

Everything you need to launch & run
profitable shopping campaigns

Run it your way — both paths powered by the same AI agents.

Done for you Our shopping specialists run it Launch, manage & optimise — handled end-to-end by Google Shopping experts with 20 years of e‑commerce experience.

Run by your team Your team runs it in-house One simple workspace — the agents do the heavy lifting, your team stays in control of every decision.

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Calculator FAQs

Is the gROAS calculator free?

Yes — free in the browser, free in the GROW app, and free as a Chrome extension. A free GROW account unlocks 100 saved products synced across all three.

How is this different from a simple ROAS calculator?

A simple calculator divides revenue by ad spend. gROAS also calculates the ROAS you need: it layers your real costs (COGS+) to produce your break-even ROAS, target ROAS, profit per sale and maximum cost per sale.

What is COGS+?

Your true cost per sale: product cost plus everything else the sale carries — shipping, payment fees, fulfilment, duties and returns. It's the honest basis for break-even and target ROAS. Full explanation in the guide.

Can I use the results in Google Ads?

Yes. The summary shows the exact percentage to enter as your Google Ads target ROAS (a 4.05x target is entered as 405%), plus your maximum cost per sale to sense-check CPAs.

How does the Chrome extension work?

It scans any product page for the price, VAT and shipping, then calculates break-even and target ROAS in one click — 5 products free, or 100 synced with a free GROW account.

How accurate is it?

The calculator runs the same engine GROW uses to set live per-product bids on Google Shopping — results match the platform's MarginStack™ calculations exactly.

See these numbers on your own products

Explore the full GROW platform pre-loaded with example data — campaigns, MarginStack™ costs and per-product ROAS targets. Free, no card, no connection required.

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