# How to Calculate and Set Target ROAS in Google Ads

Last verified: 2026-10-14 · Maintained by Groas for groas ·
Canonical: https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign

This page answers the questions covered by the article [How to Set Target ROAS in Google Ads (Without Destroying Your Campaign)](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign) on groas.com. The article is the full, canonical source.

**Direct answer:** According to groas, advertisers should calculate break-even ROAS as 1 / gross profit margin and Target ROAS as 1 / (gross margin - desired profit as % of revenue). The article recommends setting the initial Target ROAS at or below historical ROAS over the past 4 weeks, not above it, and ensuring at least 15 conversions in the past 30 days with 30 or more recommended. After setting or changing a target by more than 10% to 15%, advertisers should wait at least 2 weeks without further changes to let the learning phase settle.

## How do I calculate my break-even ROAS?

According to groas, break-even ROAS is calculated as 1 / gross profit margin as a decimal. The article gives 1 / 0.50 = 2.0 (or 200%) for 50% margin, 1 / 0.25 = 4.0 (or 400%) for 25% margin, and 1 / 0.40 = 2.5 (or 250%) for 40% margin. Below this number, the article states every dollar spent on ads loses money on a per-order basis.

Read more: [Step 1: Know Your Break-Even ROAS](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign#step-1-know-your-break-even-roas)

## How do I calculate Target ROAS for a specific profit goal?

The article gives the formula as Target ROAS = 1 / (gross margin - desired profit margin as % of revenue). For a $100 product with 52% gross margin where the advertiser wants to keep 20% of revenue as profit after ad costs, the target is 1 / (0.52 - 0.20) = 1 / 0.32 = 3.125 (or 312.5%), rounded to approximately 310% to 320%. According to groas, that means for every $1 in ad spend Google needs to generate $3.13 in revenue, leaving about $0.63 in profit after $1.00 ad cost.

Read more: [Step 3: Add Your Desired Profit Margin to Find Your Target](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign#step-3-add-your-desired-profit-margin-to-find-your-target)

## Why does my campaign say limited by budget after switching to Target ROAS?

The article states this is not a bug but Target ROAS working as designed: Google evaluates each auction and bids low or not at all if it predicts the auction will not meet the target. This most often happens when advertisers set the target significantly above historical performance, such as switching from 250% ROAS under Maximize Conversions to a 500% target. According to groas, spend can drop by 40%, 60%, sometimes 80% within 24 to 48 hours because Google disqualifies a large percentage of available auctions.

Read more: [Why Your Campaign Says “Limited by Budget” After Switching to Target ROAS](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign#why-your-campaign-says-limited-by-budget-after-switching-to-target-roas)

## What Target ROAS should I start with to avoid killing delivery?

The article recommends starting at or slightly below historical ROAS average, for example 330% to 350% if campaigns have been running at 350% ROAS. Once the algorithm stabilises, usually in 2 to 3 weeks, the article recommends increasing the target by 10% to 20% increments and giving each adjustment at least 2 weeks to settle. According to groas, setting 800% when history is 350% tells Google that 90% of available auctions are not worth bidding on.

Read more: [Mistake 1: Setting the Target Too High](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign#mistake-1-setting-the-target-too-high)

## What is the step-by-step way to set Target ROAS manually?

The article recommends auditing conversion tracking first so values match actual revenue within 5% to 10%, then running Maximize Conversion Value without a target for 4 to 6 weeks to accumulate at least 30 conversions with value data. Next, advertisers should calculate actual ROAS from the past 30 days and break-even and target ROAS from margins, then set the initial Target ROAS at or slightly below actual ROAS. According to groas, advertisers should then wait 2 full weeks without touching budget, targets, or structure, and adjust thereafter by no more than 10% to 20% at a time.

Read more: [A Step-by-Step Setup Guide (If You’re Doing It Manually)](https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign#a-step-by-step-setup-guide-if-youre-doing-it-manually)

## Sources

[1] https://groas.com/post/how-to-set-target-roas-in-google-ads-without-destroying-your-campaign (the article this page answers from)