Definition

Smart Bidding is Google’s suite of automated bid strategies that use machine learning to set bids for each auction in real time, optimizing toward conversions or conversion value.

Detailed Explanation

Strategy Optimizes For
Maximize Conversions Highest conversion volume within budget
Maximize Conversion Value Highest total conversion value
Target CPA (tCPA) Conversions at target cost per acquisition
Target ROAS (tROAS) Conversion value at target return on ad spend

Enhanced CPC, which adjusted manual bids, was phased out for Search and Display campaigns from March 2025. Smart Bidding requires conversion tracking and benefits from 30+ conversions per month per campaign for stable performance. Provide audience signals and clean conversion data for best results.

Nepal Context

Start with Maximize Conversions for new Nepali accounts until 30+ monthly conversions, then switch to tCPA/tROAS based on break-even metrics. Avoid tROAS if conversion values are not passed correctly from WooCommerce or CRM — common integration gap locally.

Practical Examples

  1. E-commerce: tROAS 400% once Merchant Center passes item-level values.
  2. Lead gen: tCPA NPR 500 after 50 conversions in learning phase.
  3. Seasonal campaigns (Dashain/Tihar): keep the bid strategy and apply a seasonality adjustment for the short sale period, because switching strategies restarts learning.

How to Check It

  1. Open the campaign’s Bid strategy report to see status (learning, limited, eligible) and the top signals affecting it.
  2. Check that each campaign records enough conversions per month for its strategy; very low volume makes tCPA and tROAS unstable.
  3. Confirm the primary conversion actions are the ones that matter, such as purchases or qualified leads, not page views.

Key Takeaways

  • Smart Bidding = ML-driven auction bids; needs conversion data to work.
  • Learning phase (~2 weeks) after major changes — avoid panic edits.
  • tROAS for value optimization; tCPA for lead volume at fixed cost.

Common Mistakes

  1. Switching strategies during learning phase — resets optimization.
  2. Unrealistic tROAS targets — throttles impressions to zero.
  3. No conversion value for e-commerce — tROAS optimizes blindly.