Can I use bid adjustments alongside Target CPA or Target ROAS?

This depends on the specific platform and strategy, some automated strategies like Target CPA already account for these signals internally and limit or ignore manual bid adjustments layered on top, while others still allow them.

How do I know which bid adjustments to set?

Pull performance data segmented by device, location, schedule, and audience, and look for segments with a meaningfully different conversion rate or CPA than the account average, that gap is the evidence an adjustment is worth making.

Can bid adjustments be negative?

Yes, a negative adjustment (for example, -50% on a weak-performing device) reduces the bid for that condition rather than increasing it, and is just as commonly used as positive adjustments.

Do bid adjustments expire or need to be reviewed?

They should be reviewed periodically, performance by segment can shift over time, and an adjustment that made sense six months ago may no longer reflect current patterns.

Do bid adjustments apply retroactively to past performance data?

No, they only affect bidding behavior going forward from when they are set, past performance data is not recalculated or changed by a newly added adjustment.

What happens if I stack multiple bid adjustments on one auction?

They typically combine according to the platform's own stacking logic (often multiplicatively rather than simply added together), which can produce a larger combined effect than any single adjustment alone, worth checking each platform's specific documentation.

What Is Bid Adjustment?

A bid adjustment is a percentage modifier applied on top of a base bid for a specific condition, device, location, time of day, or audience, increasing or decreasing how much is bid when that condition is met. It's a manual layer of control an advertiser can apply to encode known business context directly into bidding behavior.

How Bid Adjustment Works

Bid adjustments work by applying a percentage change relative to a campaign's base bid whenever a defined condition occurs. If mobile users convert at a notably higher rate than desktop for a given account, a positive device bid adjustment on mobile tells the system to bid more aggressively specifically for that segment, without touching the base bid used for other conditions.

The four most common categories are device (mobile, desktop, tablet), location (specific cities, regions, or radius targeting), ad schedule (particular hours or days of the week), and audience (past converters, high-intent remarketing lists, or other defined segments). Multiple adjustments can stack on the same auction, compounding their effect.

Examples & Use Cases of Bid Adjustment

A restaurant chain applies a +30% location bid adjustment for searches within 2km of its physical locations, recognizing that proximity strongly predicts an actual visit.
A B2B software company applies a +20% ad schedule adjustment for weekday business hours, when its actual buyers are most active, and a -40% adjustment for weekend traffic, which historically converts poorly.
An ecommerce brand applies a +25% audience adjustment for users on its cart-abandoner remarketing list, recognizing they're meaningfully more likely to convert than cold, new traffic.

How to Calculate Bid Adjustment?

Bid adjustments are expressed as a percentage change applied to the base bid: a +20% device adjustment on a ₹50 base bid results in an effective bid of ₹60 for that condition; a -30% adjustment results in ₹35. Where multiple adjustments apply to the same auction simultaneously, platforms combine them according to their own specific stacking rules, which can vary by platform.

Bid adjustments are a manual layer of control that can sit on top of some bidding strategies, letting an advertiser explicitly tell the system to weight a known condition more or less heavily. With more advanced predictive bidding strategies, many of these same signals, device, time, audience, are already factored in automatically, which is why some platforms limit or retire manual bid adjustments once a campaign moves onto certain fully automated strategies.

How to Interpret It

Bid adjustments should be set from evidence, not assumption, pulling actual segment-level performance data broken down by device, location, schedule, or audience before deciding to adjust, rather than adjusting based on a general hunch about which segment "should" perform better. An adjustment that isn't backed by a clear, sustained performance gap in the data is more likely to introduce inefficiency than remove it.

Why Bid Adjustment Matters

Bid adjustments let an advertiser encode business knowledge, like knowing evening searches convert better, or that one city consistently underperforms, directly into the bidding logic, without needing to fully hand over control to a fully automated strategy, giving accounts a middle ground between full manual control and full algorithmic delegation.

Frequently Asked Questions

Can I use bid adjustments alongside Target CPA or Target ROAS?: This depends on the specific platform and strategy, some automated strategies like Target CPA already account for these signals internally and limit or ignore manual bid adjustments layered on top, while others still allow them.
How do I know which bid adjustments to set?: Pull performance data segmented by device, location, schedule, and audience, and look for segments with a meaningfully different conversion rate or CPA than the account average, that gap is the evidence an adjustment is worth making.
Can bid adjustments be negative?: Yes, a negative adjustment (for example, -50% on a weak-performing device) reduces the bid for that condition rather than increasing it, and is just as commonly used as positive adjustments.
Do bid adjustments expire or need to be reviewed?: They should be reviewed periodically, performance by segment can shift over time, and an adjustment that made sense six months ago may no longer reflect current patterns.
Do bid adjustments apply retroactively to past performance data?: No, they only affect bidding behavior going forward from when they are set, past performance data is not recalculated or changed by a newly added adjustment.
What happens if I stack multiple bid adjustments on one auction?: They typically combine according to the platform's own stacking logic (often multiplicatively rather than simply added together), which can produce a larger combined effect than any single adjustment alone, worth checking each platform's specific documentation.

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