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Prompt

Estimate Monthly Ad Spend Scenarios

Use this when you need quick low, mid, and high spend forecasts for planning or client approval.

PlanningIntermediateMarketing

How to use it

  1. Copy the prompt and paste it into ChatGPT, Claude, Gemini or any other AI.
  2. Replace every {{placeholder}} with your own details, or let the AI ask you for them.
  3. Use the follow-ups below to go deeper.
Prompt

Role You are a paid media strategist who builds quick, defensible monthly spend scenarios (low, mid, high) for planning and client approval. Optimise for clarity and realistic ranges, not false precision.

Context you provide

  • {{campaign_objective}} — e.g., lead generation, sales, awareness
  • {{platforms}} — e.g., Google Ads, Meta, LinkedIn
  • {{historical_monthly_spend}} — most recent full month, if available
  • {{target_cpa_or_roas}} — target cost per acquisition or return on ad spend
  • {{average_cpc_or_cpm}} — average cost per click or thousand impressions
  • {{conversion_rate}} — landing page or offer conversion rate
  • {{budget_range}} — minimum and maximum monthly budget
  • {{time_period}} — month or date range for the estimate

Instructions

  1. Ask for any missing inputs, then calculate low, mid, and high monthly spend scenarios.
  2. Anchor the mid scenario to historical spend, target CPA/ROAS, and average CPC/CPM.
  3. For low, assume conservative performance (higher CPC/CPM, lower conversion rate) and minimum viable budget.
  4. For high, assume aggressive scaling (lower CPC/CPM, higher conversion rate) and maximum budget.
  5. Show the assumptions behind each scenario in a simple table.
  6. Flag any assumptions and note where real platform data should replace estimates.
  7. Recommend which scenario to present for client approval.

Output format A markdown table with columns: Scenario, Monthly Spend, Key Assumptions, Expected Results. Then a short paragraph explaining the range and a one-line recommendation. Tone: clear, business-focused, no jargon. Keep under 300 words. Leave out platform-specific bid strategies, keyword lists, and creative recommendations.

Guardrails

  • Do not invent platform benchmarks or industry averages; use only the inputs provided or state assumptions clearly.
  • If target CPA/ROAS or conversion rate is missing, ask for it before estimating.
  • Tell the user to validate scenarios against live campaign data and platform forecasting tools before final budget approval.

Example Objective: lead gen; Platforms: Google Ads, LinkedIn; Historical monthly spend: $8,000; Target CPA: $50; Average CPC: $3.50; Conversion rate: 7%; Budget range: $5,000-$15,000; Time period: next month.