Resources
Free Google Ads Calculators and Tools
Two calculators that do the profit math before you touch a bid: the contribution margin one order leaves after every cost, and the ROAS that margin needs before ads earn anything. Both run in your browser and keep nothing you type.
Calculators
Two Calculators That Answer Whether Ads Pay
Each one opens with a worked example you can overwrite. The margin calculator feeds the ROAS calculator: work out what one order leaves, then find the ROAS that margin needs.
ROAS Calculator With Break-Even and Target ROAS
Revenue, ad spend, contribution margin and your management fee in. ROAS, break-even ROAS, break-even with the fee, a target ROAS for the profit you want, and the profit or loss at your numbers out.
- Break-even ROAS = 1 ÷ contribution margin
- Fee-adjusted break-even and target ROAS
- A table of break-even ROAS at 25% to 55% margins
Shopify Profit Margin Calculator
One order's price and every cost that comes off it: product, shipping you pay, packaging, card processing, returns and your plan fee. Contribution margin per order in dollars and percent, monthly contribution before ads, and your break-even ROAS out.
- Returns and card fees averaged into every order
- Shopify plan fees and card rates as of October 2026
- Margin at three product cost levels
Guides
Guides Behind the Math
The formulas in the calculators come from these guides, with worked examples and the Google Ads settings they feed.
Are the calculators free?
Yes. Both calculators are free, with no signup, no email and no limit on how often you use them.
Do you store the numbers I enter?
No. The math runs in your browser. Nothing you type is sent to us, to a server or to a third party, and nothing is saved when you leave the page.
How accurate are the results?
The formulas are standard and shown on each page, so the result is as accurate as the numbers you enter. The contribution margin matters most: a margin that leaves out returns, shipping or card fees makes every break-even ROAS too low.
Can you check my Google Ads account against these numbers?
Yes. A free Google Ads audit looks at the account behind the numbers. We tell you whether we found what is holding the return back and name one or two issues; the full list and the fixes are part of management.
Free audit
Want Us to Check the Account Behind the Numbers?
Send us the account and the margin you worked out. We tell you whether we found what is holding the return back and name one or two issues before any work starts.
- Google Partner agency
- Shopify Partner
- No obligation