Business calculation resources

ROI and Marketing Return: A Practical Measurement Guide

A citation-ready guide to ROI, ROAS, CAC payback, contribution margin, and the limits of single-metric decisions.

Intended audience: SaaS teams, agencies, founders, and marketing educators

Key points

• ROI and ROAS answer different questions and should not be treated as interchangeable.
• CAC payback should be read alongside gross margin, retention, and cash runway.
• Use consistent time periods and separate modeled assumptions from observed results.

Related calculators

• roi
• roas
• cac payback period
• contribution margin

Official sources

• U.S. Small Business Administration: Manage your finances
• SEC: Investor.gov financial calculators

Editorial note: This page is educational. Rates, tax rules, lending terms, payroll obligations, and operating assumptions can vary. Verify decisions against current official guidance and your own records.