If Google Ads will not let you start a Conversion Lift study, the usual cause is not a broken browser or missing button: Conversion Lift is restricted to eligible accounts, campaigns and measurement setups. First confirm that your account has access with your Google account representative. Then check the documented user-based gates—at least 1,000 observed conversions, a campaign budget of at least USD 5,000, a compatible conversion action, a supported campaign type and no conflicting lift study—before investigating diagnostics or study power.
What the error actually means
Google Ads describes Conversion Lift as an incrementality experiment. It estimates conversions caused by advertising by comparing a treatment group that is allowed to see ads with a control group that is held back from seeing them. Because the method requires Google to create a valid experiment and report results safely, the feature is not enabled for every Google Ads account.
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That account-level restriction is separate from campaign eligibility. An account can have the Lift studies menu but still be unable to select a particular campaign, conversion goal or study design. Conversely, an advertiser may meet the numerical setup requirements and still lack access to the product. Public Google Ads documentation does not promise access to all advertisers; the definitive answer for your account comes from the in-account selector and your Google account representative.
The setup interface can expose several different states. A campaign may appear as Eligible, Needs attention or Not found. A missing Conversion Lift option generally points to account access. A selectable study with a blocked campaign usually points to campaign support, an existing study assignment or a data configuration issue.
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Run these checks in order
Use this sequence rather than repeatedly refreshing the page. It separates a permission problem from a fixable configuration problem.
- Confirm account access. Ask your Google account representative whether Conversion Lift is enabled for the specific Google Ads account and customer ID you are using.
- Identify the study design. The requirements for user-based lift are not the same as those for geography-based lift. Do not use the user-based checklist as proof that a geo-based study should be available.
- Check the user-based thresholds. Verify observed conversions, campaign budget and a compatible conversion action using the values in the table below.
- Check campaign support and exclusions. Confirm the campaign type, geography and any beta or alpha status before troubleshooting tracking.
- Look for a conflicting study. A campaign can participate in only one Brand Lift, Search Lift or Conversion Lift study at a time.
- Resolve diagnostics. Review conversion tracking, consent signals and any warning shown by the setup diagnostics.
- Evaluate study power. If the study can be created, inspect the certainty estimate and budget guidance before deciding whether the result will answer your business question.
If the first check fails, the later checks cannot grant access. If access is confirmed, continue through the list until the status changes from unavailable or Needs attention to selectable.
Account access is the first gate
Google’s official wording is explicit: “Conversion Lift isn’t available for all Google Ads accounts.” That means an advertiser cannot enable the feature solely by changing a campaign setting, adding a conversion tag or increasing spend.
What to ask your account representative
- Whether Conversion Lift is enabled for your account, rather than merely available as a product in your market.
- Whether the requested design is user-based, geography-based or both.
- Which campaign types and conversion actions the account team will approve for the study.
- Whether an account-level policy, beta restriction or market limitation is preventing the option from appearing.
Include the customer ID, the campaign IDs, the intended conversion action and the proposed study dates in your request. Those details let the representative distinguish an access decision from a campaign selector problem. Do not assume that access on one account, manager account or market automatically transfers to another.
User-based Conversion Lift requirements
The following are the documented checks for the user-based setup. They are product requirements and guidance shown by Google Ads, not independent performance benchmarks.
| Check | What Google documents | What to verify |
|---|---|---|
| Observed conversions | At least 1,000 observed conversions. Supplementary conversions do not count toward this minimum. | Use the primary, observed conversion actions selected for the study and confirm that the account has reached the threshold. |
| Campaign budget | At least USD 5,000. Google says a study cannot be saved below this threshold. | Check the budget associated with the campaigns included in the study and use the currency and budget scope shown in your account. |
| Conversion action | At least one compatible conversion action is required. | Select a conversion goal that Google Ads recognizes as eligible for the chosen campaigns and study. |
| Campaign types | The current user-based page lists Display, Search, Video, Demand Gen, App Campaigns and Performance Max. | Confirm that the campaign is one of the listed types and that its settings meet the selector’s conditions. |
| Excluded campaign types | iOS App campaigns and Travel Ads are excluded from that user-based list. | Do not try to force an excluded campaign into a user-based study; choose another eligible campaign or ask the account representative about alternatives. |
| Newer campaign types | Campaign types in alpha or beta may require representative confirmation. | Obtain confirmation before treating an unavailable beta campaign as a technical error. |
| Study membership | A campaign can be in only one Brand Lift, Search Lift or Conversion Lift study at a time. | Remove the campaign from its existing study, then refresh the campaign-selection window. |
Thresholds are evaluated in the context of the configured study. A high account total does not necessarily make every conversion action eligible, and a campaign with enough spend can still fail the campaign-type or study-membership check.
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How to create a user-based study when the account is eligible
Once account access and campaign eligibility are confirmed, use Google’s published navigation. Labels can change as the interface is updated, but the sequence is:
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- Select Experiments, then open Lift studies.
- Choose to start a study and select Conversion Lift.
- Choose users-based test groups.
- Select the eligible campaigns. Read each status instead of selecting every campaign in bulk.
- Choose the conversion goals that represent the outcome you want to measure.
- Select the metric focus and enter the study start and end dates.
- Set the holdback split, which determines the share assigned to the control group.
- Review the displayed study-power estimate and any budget guidance.
- Create the study. The configured study begins on its specified start date, not necessarily at the moment you finish the form.
If a campaign is marked Needs attention, open the issue details and correct the reported condition. After resolving it, refresh the campaign-selection window; Google specifically notes that a refresh may be needed before the campaign becomes selectable. A Not found status is different: it can indicate that the uploaded campaign cannot be matched or is not available to the study selector, so verify the campaign identifier and account context before changing conversion settings.
Why a campaign is unavailable even after access is granted
The campaign type is outside the user-based list
iOS App campaigns and Travel Ads are not included in the current user-based campaign list. A campaign in an alpha or beta format may also need confirmation from the account representative. These are eligibility boundaries, not tracking errors.
The campaign is already in another lift study
Brand Lift, Search Lift and Conversion Lift share the one-study-at-a-time restriction for a campaign. Check existing and scheduled studies, remove the campaign from the conflicting study according to your account workflow, and refresh the selector. Starting a second study without removing the first is not supported.
The selected conversion goal is incompatible
A study needs at least one compatible conversion action. A goal can be present in the account and still be unsuitable for this experiment because of its configuration, data availability or relationship to the selected campaign. Test the setup with the conversion action Google Ads identifies as eligible rather than substituting supplementary conversions for the observed-conversion requirement.
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The account has data, but not the right data
Supplementary conversions do not satisfy the documented observed-conversion minimum. Also check that the action is recording conversions in the same account and within the campaign and date context used by the setup. A large number of unrelated conversions elsewhere in the account will not automatically make the selected study valid.
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Conversion tracking and diagnostics
Conversion Lift depends on a conversion action that Google Ads can use consistently in treatment and control groups. Review the conversion action’s status, counting method, source and recent activity before changing campaign settings.
Improve signal quality
- Use a compatible primary conversion action for the study.
- Follow Google’s recommendation to implement enhanced conversions where appropriate.
- Improve consent-related signals so Google Ads can measure eligible users more reliably under your privacy configuration.
- Check that tagging, imported events or offline uploads are arriving in the account that owns the study.
The setup diagnostics can show warnings even when the study is still creatable. Google says a study can be created and saved regardless of warning severity, while recommending that gaps be resolved for better accuracy and reliability. Treat that distinction carefully: a warning is a data-quality risk, not necessarily a hard block, but ignoring it can weaken the usefulness of the result.
Separate a blocker from a warning
- Hard blocker: the interface prevents saving, the campaign cannot be selected, or account access is absent.
- Quality warning: the interface permits creation but flags missing or weak signals. Resolve it when possible before the start date.
- Interpretation risk: the study runs, but the power estimate is low or the conversion definition does not match the business decision.
Study power, certainty and budget
Being allowed to create a study does not guarantee that it will detect a meaningful lift. Google Ads estimates study power from the selected conversion actions, budget, duration, holdback split, historical account-level campaign data and estimated lift.
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The interface displays a certainty range from 50% to 95% in five-percentage-point increments. Google describes 90% or higher as the aim for the most reliable results. Values from 50% through below 90% may be directional rather than conclusive, and the interface can provide budget guidance when the estimate is below 90%. This is guidance about the likelihood of detecting lift, not a promise that the campaign will produce a particular result.
What to change when power is low
- Review whether the selected conversion action has enough historical volume and is the clearest business outcome.
- Consider whether a longer study duration is practical, remembering that seasonality or major campaign changes can affect interpretation.
- Evaluate the holdback split: a very small control group can reduce the information available for comparison, while a large holdback can reduce exposed users.
- Use the budget guidance shown by Google Ads instead of assuming that a general spend increase will solve every power issue.
Do not alter several variables casually and then treat the resulting certainty estimate as a controlled before-and-after comparison. Record the dates, conversion goals, holdback and campaign changes so the eventual result has a clear interpretation.
How Conversion Lift calculates incremental conversions
For user-based reporting, Google defines incremental conversions—also called absolute lift—as treatment conversions minus control conversions. The treatment group sees the ads; the control group is held back from seeing them. The difference estimates conversions associated with the advertising exposure rather than simply counting all conversions after a campaign ran.
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Demand Gen-only studies include modeled delayed incremental conversions by default. The model is based on conversion delays observed during the study, so the reported total can include conversions that occur after the initial ad interaction rather than only immediate responses. Read the reporting definition and date window before comparing that result with a platform-reported conversion total.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When geography-based lift is the better route
Consider geo-based lift only when the account has access to it and the business can support geographic experimentation. Google describes it as an experiment in which geographic groups are assigned different advertising conditions and outcomes are compared at the aggregated-area level.
Geo-based checks
- Use compatible conversion tracking, or supply offline data through the account team when that is the supported measurement path.
- Confirm campaign-type support with the Google account representative; do not import the user-based campaign list.
- For the geo-split methodology, campaigns must target one country.
- Ensure the geographic groups have enough historical activity and a practical separation for the proposed test.
Geo-based lift is not a workaround for missing account access. It is a distinct design with its own eligibility decision, data requirements and assumptions. If your campaigns span multiple countries, a single-country geo-split may require restructuring or a different study plan.
A practical decision tree for common symptoms
There is no Conversion Lift option
Start with account access. Contact the Google account representative and ask whether Conversion Lift is enabled for the account and intended study design. Do not spend time rebuilding tags until this is confirmed.
The option exists, but no campaigns are selectable
Check campaign type, iOS App or Travel Ads exclusions, alpha or beta status and existing Brand Lift, Search Lift or Conversion Lift membership. Correct the issue, then refresh the selector.
The study will not save
Check the user-based budget threshold, observed conversions, compatible conversion action and any blocking status in the campaign list. A budget below the documented minimum prevents saving; a supplementary conversion count cannot substitute for observed conversions.
The study saves but shows warnings
Review conversion diagnostics, enhanced conversions and consent-related signals. Because warnings do not necessarily prevent creation, decide whether to proceed based on the likely impact on measurement accuracy, and fix the gaps before the study starts when possible.
The study exists but the result looks inconclusive
Inspect the certainty estimate and the inputs that determine power: conversion action, budget, duration, holdback, historical data and estimated lift. Treat a value below Google’s 90% reliability aim as potentially directional, and use the displayed budget guidance before drawing a firm business conclusion.
What to document before escalating
A concise escalation prevents repeated back-and-forth. Capture:
- Google Ads customer ID and the account or manager context in which you are working.
- Study design: user-based or geography-based.
- Campaign IDs, campaign types, countries targeted and current selector status.
- Conversion action names, observed conversion count and whether data is imported or tagged.
- Budget scope and amount shown in the account.
- Any existing Brand Lift, Search Lift or Conversion Lift study involving the campaigns.
- The exact error or status label, including Eligible, Needs attention or Not found.
- Study dates, holdback split and the displayed certainty estimate, if the setup page opens.
Send this information to the Google account representative rather than sharing sensitive user-level data. The representative can confirm account access and campaign support; your implementation or analytics team can then correct tracking and consent issues identified in diagnostics.
Limits you should keep in mind
Eligibility, thresholds, supported campaign types, beta availability, reporting behavior and interface labels can change. The checks above reflect Google Ads Help guidance reviewed on October 13, 2026. Your account’s selector and representative take precedence if the product documentation changes or if Google applies an account-specific restriction.
Neither a high conversion total nor a large budget guarantees a statistically conclusive lift estimate. Those inputs affect eligibility and power, while the experiment’s design, data quality, holdback and actual incremental effect determine what the study can establish.
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A missing or blocked Conversion Lift study is usually an eligibility or configuration issue, not a browser fault. Confirm account access first; then verify the user-based thresholds, campaign support, study conflicts and conversion diagnostics. If creation succeeds, use the displayed power estimate—aiming for Google’s 90% certainty guidance—before treating the result as conclusive. Use geography-based lift only when its separate data, campaign and single-country requirements fit your account.
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