Advertising · United States
Ecommerce Bid Simulator
Simulate a Google Ads or marketplace ad bid change before you push it live. Enter current impressions, CTR lift per bid tier, CPC, conversion rate and AOV — see projected clicks, spend, conversions, revenue and ROAS. Free, browser-only, no signup.
Inputs
How much CTR you expect to gain (e.g. from top-of-page placement).
Result
- Projected CTR
- 2.88%
- Projected clicks / week
- 575
- Projected spend / week
- $488.75
- Projected conversions / week
- 16.1
- Projected revenue / week
- $998.20
- Projected ROAS
- 2.04×
- Projected CAC
- $30.36
Numbers are directional — actual results depend on quality score, competition, and creative.
Direct answer
A bid simulator projects how a bid change will move clicks, CPC, conversions, revenue and ROAS. Use it before touching live budgets so you know the downside range.
Key takeaways
- Higher bids usually raise CTR and CPC together.
- ROAS is more useful than CPC when comparing bid tiers.
- Always model a lower-lift scenario as a safety check.
Method
Clicks = Impressions × CTR. Spend = Clicks × CPC. Conversions = Clicks × CVR. Revenue = Conversions × AOV. ROAS = Revenue ÷ Spend.
How this tool works
The tool multiplies impressions by your projected CTR, then by CPC to get spend, and by conversion rate and AOV to get revenue and ROAS.
When to use this
Before increasing bids on Google Shopping, Sponsored Products, Walmart Connect or TikTok Ads — or before pausing a losing campaign.
Step-by-step
- Pull last 7–14 days of impressions, CTR, CPC and CVR from your ad platform.
- Estimate the CTR lift from the new bid tier (start conservative).
- Enter your true AOV — not gross basket size.
- Compare projected ROAS with your break-even ROAS.
Common mistakes
- Assuming CPC stays flat when raising bids — it usually rises.
- Overestimating CTR lift from a small bid change.
- Comparing ROAS in isolation without checking margin.
Frequently asked questions
What is a bid simulator tool?
A bid simulator estimates how a change in your ad bid could affect impressions, clicks, cost and conversions before you commit the change. Google Ads has one built in; this tool works for any channel using inputs you paste in.
How accurate is a bid simulator?
Directional, not exact. Real auctions vary by minute. Use it to size the potential upside/downside before A/B testing.
Can I simulate marketplace ads too?
Yes — enter your Amazon Sponsored Products, Walmart Connect or TikTok Ads numbers the same way.
Method and guidance reviewed by the AIFlowBiz Editorial Team.
Related reading
Educational tool. Not financial, tax, or legal advice. Confirm current marketplace fees and tax rates from official sources.