Most first-time advertisers pick a budget that feels affordable rather than one that can actually produce a usable result. The right number starts from the data, not the wallet.

Work Backwards From Conversions

Decide how many conversions you need to trust the result — usually 30–50 — then multiply by your estimated cost per conversion. That number, not a monthly cap you feel comfortable with, is your real test budget.

A Rough Sizing Formula

• Estimate CPC from the Keyword Planner for your top terms.

• Estimate landing page conversion rate from industry benchmarks if you have no data yet.

• Multiply required conversions by cost-per-conversion to get your test budget.

Give the Learning Phase Room to Breathe

A budget that runs out before the algorithm finishes learning tells you nothing about whether the offer works.

Whatever number you land on, plan for at least two full weeks of consistent daily spend before drawing conclusions. Pausing and restarting resets the learning phase and wastes the budget you already spent.