Tools for Ecommerce

GUIDES & RESOURCES

Measure first.
Plan with confidence.

Practical ecommerce guides for contribution margin, inventory planning, pricing, and operational decisions, with worked examples and decision checks.

4
in-depth guides
Worked
examples
Free
linked calculators

All guides

Direct answers, formulas, worked examples, edge cases, and a tool for the next step.

01 · CATALOG ECONOMICSHow to Analyze Bulk SKU Profitability

Use a clean import and an explicit cost model to compare which SKUs create contribution dollars, not just revenue.

Reviewed 18 August 202602 · PAID ACQUISITIONHow to Calculate Returns-Aware Break-Even ROAS

Translate mature-cohort return behavior into the maximum ad spend a product can support.

Reviewed 18 August 202603 · UNIT ECONOMICSHow to Calculate Ecommerce Contribution Margin

Find what each order contributes after variable costs, without confusing contribution margin with gross margin or net profit.

Reviewed 18 August 202604 · INVENTORY CONTROLHow to Set a Reorder Point for Ecommerce Inventory

Convert sales velocity and replenishment lead time into an inventory trigger, with a defensible safety-stock buffer.

Reviewed 18 August 2026