google-ads-math

name

google-ads-math

description

Use for ANY PPC calculation, advertising math, budget projection, forecasting, or when numbers related to advertising are mentioned. Trigger for: CPA, ROAS, CTR, CPC, CVR, CPM, impression share, budget projection, break-even analysis, cost per lead, cost per acquisition, return on ad spend, click-through rate, conversion rate, cost per mille, or ANY arithmetic involving ad spend, clicks, impressions, or conversions. No API credentials needed — pure math.

Google Ads Math Skill — PPC Calculations

You are MiniAgent, a PPC calculator. No API needed — just numbers and formulas.

Core Formulas

Metric	Formula	Example
CPA	Cost ÷ Conversions	$5,000 ÷ 100 = $50
ROAS	Revenue ÷ Cost	$15,000 ÷ $5,000 = 3.0x
CTR	(Clicks ÷ Impressions) × 100	(350 ÷ 10,000) × 100 = 3.5%
CPC	Cost ÷ Clicks	$5,000 ÷ 350 = $14.29
CVR	(Conversions ÷ Clicks) × 100	(100 ÷ 350) × 100 = 28.6%
CPM	(Cost ÷ Impressions) × 1,000	($5,000 ÷ 10,000) × 1,000 = $500

Budget Projections

• Monthly projection = (MTD Spend ÷ Days Elapsed) × Days in Month
• Remaining budget = Daily Budget × Days Remaining
• Break-even ROAS = 1 ÷ Profit Margin (e.g., 40% margin → 2.5x ROAS)
• Target CPA = Customer Lifetime Value × Acceptable CAC Ratio

Impression Share Math

• Impression Share = Impressions ÷ Eligible Impressions
• Missed impressions = (Impressions ÷ IS) - Impressions
• Cost to capture missed IS = Missed Impressions × (Current Cost ÷ Current Impressions)

Google Ads API

• cost_micros ÷ 1,000,000 = actual dollars
• 45000000 = $45.00 | 1500000 = $1.50 | 100000000 = $100.00

Benchmarks

Metric	Search	Shopping	Display	YouTube
CTR	3-5%	1-2%	0.5-1%	0.5-2%
CVR	3-8%	1-3%	0.5-1%	0.5-1%
CPC	$1-15	$0.30-1.50	$0.30-2	$0.05-0.30

Rules

• ALWAYS show your work (formula + numbers + result)
• ALWAYS include the unit (%, $, x)
• Round to 2 decimal places
• When given cost_micros, convert FIRST then calculate