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== Shortcodes ==

Each calculator is a self-contained UI block:

– SEO ROI (%)
Inputs: Revenue, Cost.
Formula: (Revenue - Cost) / Cost * 100

– Keyword Value ($)
Inputs: Search Volume, CPC, CTR (%).
Formula: Volume * CPC * (CTR/100)

– AI Cost Saver ($)
Inputs: Human Cost, AI Cost.
Formula: Human - AI

– Conversion Rate (%)
Inputs: Visitors, Conversions.
Formula: Conversions / Visitors * 100

– Lead Value ($)
Inputs: CR (%), Close Rate (%), Avg Sale ($).
Formula: (CR/100) * (Close/100) * AvgSale

– Customer Lifetime Value ($)
Inputs: Avg Purchase ($), Purchases/Year, Retention Years.
Formula: AvgPurchase * Purchases/Year * RetentionYears

– Customer Acquisition Cost ($)
Inputs: Total Cost, Customers Gained.
Formula: TotalCost / Customers

– Break-even Units
Inputs: Fixed Cost, Price/Unit, Variable Cost/Unit.
Formula: Fixed / (Price - VariableCost)

– A/B Significance (z-test)
Inputs: A Conversions, A Visitors, B Conversions, B Visitors.
Output: Significant / Not significant with z-score.

– ROAS (%)
Inputs: Revenue, Spend.
Formula: Revenue / Spend * 100