When a client asks to double their budget and expects double the results, most people answer with vague warnings. Performance Planner answers with exact numbers — projected conversions, projected ROAS, and the precise spend level where profitability ends.
Your client wants to double their Google Ads budget next month. They expect double the results.
You know that’s not how it works. Scaling ads means diminishing returns. ROAS drops as spend increases. But how do you explain this with actual numbers instead of vague warnings?
Or maybe you’re managing your own e-commerce store. You want to increase spend from $1,500 to $3,000 per month. Will you stay profitable? Where’s the break-even point?
This is exactly what Google Ads Performance Planner solves. It lets you forecast how budget changes will affect your results before spending a single dollar. You can model different scenarios, identify your profit limits, and present data-backed projections to clients or stakeholders.
In this guide, I’ll show you exactly how to use it, what the graphs actually mean, and one critical limitation you need to know.
01What Is Google Ads Performance Planner?
Performance Planner is a forecasting tool built into Google Ads that predicts how changes to your campaigns will affect conversions, conversion value, and ROAS — before you actually change anything. It uses your historical campaign data combined with Google’s auction insights to model different budget scenarios.
Performance Planner vs Keyword Planner Forecasts
| Feature | Keyword Planner | Performance Planner |
|---|---|---|
| Data source | Generic keyword estimates | Your actual campaign history |
| Accuracy | Low — no real account data | High — uses real conversions |
| Best for | New campaigns with no history | Existing campaigns (30+ days data) |
| ROAS projections | No | Yes, including diminishing returns |
| Break-even analysis | No | Yes |
| Multi-campaign view | No | Yes |
Use Keyword Planner before launch to estimate costs on a new campaign. Use Performance Planner to forecast budget changes on campaigns with at least 30 days of conversion history.
02How to Access Performance Planner
Log into ads.google.com and select the account you want to forecast.
Look for the tools icon in the left navigation panel.
Listed alongside Keyword Planner and Reach Planner.
Requires conversion history
You need campaigns with at least 30 days of conversion history for meaningful forecasts. Brand new campaigns or accounts with broken conversion tracking won’t generate reliable projections.
03Creating a Performance Plan (Step-by-Step)
Start a new plan from the Performance Planner homepage.
Choose the next month or quarter. The forecast shows expected results for that specific time window.
Select Search and Shopping campaigns only. Skip Performance Max — see section 9 for why PMAX forecasts are unreliable.
Conversion Volume for lead gen (all leads roughly equal value). Conversion Value for e-commerce (a $10 and $1,000 product are not the same). For e-commerce, always choose Conversion Value.
For e-commerce, select your purchase/transaction event — the bottom-line result that actually measures revenue.
Enter your minimum acceptable ROAS — for example 300% if that’s your break-even. The planner will flag whether each budget level hits your target.
Performance Planner generates your forecast with the budget curve, key metrics panel, and comparison view.
04Reading the Performance Planner Dashboard
- X-axis: Your ad spend
- Y-axis: Conversion value (revenue)
- Gray point: Current settings
- Blue point: Forecasted scenario
Click anywhere on the curve to see projected results at that exact spend level.
- Spend: Budget for the period
- Conversion Value: Projected revenue
- Conv. Value/Spend: Your ROAS
- Conversion Rate: Estimated rate
The conversion rate assumption is critical — verify it before trusting the forecast.
If you manually override the conversion rate from 10% to 5%, your entire forecast changes dramatically. A projection showing 4x ROAS might drop to barely break-even. Always click the conversion rate source and verify it matches your actual account reality before presenting forecasts to clients.
05The Critical Insight: ROAS Drops as Spend Increases
This is the most important thing Performance Planner reveals: scaling always means diminishing returns. Here’s what it looks like with real numbers:
| Monthly Spend | Conversion Value | ROAS | Change |
|---|---|---|---|
| $100 | $800 | 800% | Baseline |
| $500 | $3,000 | 600% | -200 pts |
| $1,200 | $5,000 | 417% | -183 pts |
| $1,800 | $5,400 | 300% | -117 pts |
| $3,000 | $6,700 | 223% | -77 pts |
Why Does ROAS Drop When You Scale?
- You’ve already captured the easy wins. Your first dollars reach the highest-intent searchers at the lowest cost. Those are limited.
- More volume requires higher bids. To win more auctions, you must outbid competitors for inventory you weren’t previously winning.
- Broader reach means lower purchase intent. Expanding reach means showing ads to users who are less ready to buy.
The pattern is universal: every account, every industry. The first $1,000 captures the most profitable traffic. Every additional $1,000 captures slightly less profitable traffic. Performance Planner makes this visible before you spend it.
06Finding Your Break-Even Point
Before you open Performance Planner, you need one number: your minimum acceptable ROAS. The formula is simple: Break-even ROAS = 100 ÷ profit margin × 100
- 40% margin → 250% break-even ROAS
- 30% margin → 333% break-even ROAS
- 25% margin → 400% break-even ROAS
Once you know your minimum, find where the ROAS curve in Performance Planner drops to that level. That spend is your ceiling. Going above it means more revenue but negative profit on the incremental spend.
Uses a logarithmic diminishing returns model. Actual results vary by account maturity, competition, and seasonality. Use Performance Planner in your Google Ads account for account-specific projections.
07Using the “Compare Performance” Tab
The Compare Performance view is built for client presentations and budget approvals. Side-by-side bars show current (gray) vs planned (blue) performance. Here’s what that looks like when a client wants to double their budget:
| Metric | Current | Planned (2× budget) | Change |
|---|---|---|---|
| Spend | $1,200 | $2,400 | +100% |
| Conversion Value | $7,560 | $8,000 | +6% |
| ROAS | 630% | 333% | -47% |
Instead of “doubling spend won’t double revenue,” you show this table. Doubling budget (+100%) only increases revenue by 6% while ROAS drops by 47%. That’s a business decision, not a vague prediction. You can export this as CSV, share a link, or screenshot for a deck.
08Performance Planner for Multiple Campaigns
When you include multiple campaigns in a single plan, Performance Planner shows an aggregate forecast and a per-campaign breakdown. The key insight: not all campaigns hit diminishing returns at the same rate.
Your Brand campaign might scale from $300 to $600/month with a modest ROAS drop, while your Generic Search campaign is already maxed out at $800/month. That discovery directly drives budget allocation. Understanding how different campaign types behave at scale sharpens these decisions further.
Run plans for Search and Shopping campaigns together. Let the data tell you where to put the next dollar.
Before scaling budget with Performance Planner, make sure your conversion tracking and account structure are solid. A broken setup makes every forecast meaningless. Our 47-point audit template finds the issues first.
09Critical Limitation: Never Use Performance Planner with PMAX
Performance Planner forecasts for Performance Max campaigns are unreliable. Using them for budget decisions can lead you seriously wrong.
- Alternates between warm and cold audiences without warning
- Shifts spend across Search, Display, YouTube unpredictably
- Google’s AI makes changes you can’t see
- Results vary significantly week to week even with stable budgets
- Search campaigns — most predictable
- Shopping campaigns — stable, product-based
- Brand campaigns — very consistent at scale
- Exclude PMAX from the plan; use Search/Shopping signals only
If most of your budget runs through Performance Max, run the plan on your Search and Shopping campaigns separately and use that as a directional signal. Do not include PMAX in the plan itself.
10When to Use Performance Planner
- Client wants to increase or cut budget
- You need data-backed budget justification
- Finding your maximum profitable spend
- Comparing how different campaigns scale
- Margin analysis before a scaling decision
- Monthly budget planning for next quarter
- Campaigns are brand new (no history)
- Forecasting Performance Max campaigns
- Planning a major account restructure
- Entering a peak season unlike prior data
- Conversion tracking is broken or unreliable
- Fewer than 30 days of campaign data
11Performance Planner Best Practices
Before trusting any forecast, click the conversion rate source and confirm it matches reality. If the tool assumes 8% but your actual rate is 3%, every projection is wrong.
More revenue at a lower ROAS can still mean losing money. Always check “Conversion Value/Spend” before making any budget decision.
Calculate 100 ÷ margin × 100 first. Without this number you don’t know which point on the curve is your limit.
Create one plan for your predictable campaigns. If you use portfolio bidding strategies, plan around those portfolio groups.
Auction dynamics shift. A forecast from three months ago may not reflect current competition. Refresh at the start of each month.
Google Ads Experiments let you run the scaled budget on a percentage of traffic before committing fully. Forecasts are projections, not guarantees.
When presenting to clients, note the conversion rate used, time period, and which campaigns are included. This prevents misunderstandings when reality differs from projection.
12The Bottom Line: Data Beats Guessing
Performance Planner transforms budget conversations from speculation to decisions grounded in data. Instead of “ROAS will probably drop if we scale,” you show exactly what happens:
- At $2,000/month: projected 380% ROAS
- At $3,000/month: projected 290% ROAS
- At $4,000/month: projected 220% ROAS
- Break-even point at 300% ROAS: $2,800/month maximum
Scaling Google Ads always means diminishing returns. The question isn’t whether ROAS will drop — it will. The question is exactly where the profitable ceiling sits. Performance Planner answers that with data.
- 1Calculate your minimum acceptable ROAS: 100 ÷ margin × 100
- 2Open Performance Planner and create a plan for Search and Shopping campaigns only
- 3Switch the graph to show ROAS (Conversion Value/Spend)
- 4Click along the curve to find where ROAS hits your minimum — that’s your max profitable budget
- 5Use the Compare tab to export a clear before/after breakdown for clients or stakeholders
One thing Performance Planner does not handle is monitoring whether spend actually tracks to plan during the month. If you want automated alerts when daily budget pacing drifts off course, the Google Ads scripts library has ready-to-use scripts for budget pacing, anomaly detection, and weekly performance summaries that run on a schedule and email you without any manual checking.
Frequently Asked Questions
Performance Planner only works when your tracking and campaign structure are solid. I personally review every submission and return a written breakdown of the top issues I find — at no cost.
