ROI & ROAS Calculation Guide: How to Measure Advertising Return and Prevent Ad Spend Losses
Why Today's Online Sellers Must Understand the Difference Between ROI and ROAS
With online advertising costs (Facebook, TikTok, and marketplace ads) rising continually, measuring marketing returns is critical. Many stores fail because they only look at the **ROAS (Return on Ad Spend)** displayed on their ad dashboard. They assume their high ROAS means high profits, failing to realize that after subtracting product cost and shipping, they are actually losing money.
Understanding the exact formulas and usage for both **ROAS** and **ROI (Return on Investment)** allows you to calculate ad campaign returns accurately and keep your business profitable.
The Difference: ROAS vs. ROI Formulas
Each metric evaluates different dimensions of marketing performance:
1. ROAS (Return on Ad Spend): Evaluates Ad Efficiency
Formula: Revenue Generated from Ads / Cost of Ad Spend
- Example: Spending 1,000 THB on ads generates 4,000 THB in sales.
- ROAS =
4,000 / 1,000 = 4x (or 400%). - Limit: ROAS only compares ad cost against revenue. It ignores inventory, packaging, and shipping costs.
2. ROI (Return on Investment): Evaluates Real Business Profitability
Formula: (Net Profit - Total Costs) / Total Costs x 100
- Example: Sales are 4,000 THB. Cost of goods and shipping is 2,000 THB, and ad spend is 1,000 THB (Total Costs = 3,000 THB).
- Net Profit =
4,000 - 3,000 = 1,000 THB. - ROI =
(1,000 / 3,000) x 100 = 33.3%. - Benefit: ROI shows you the true bottom line. It confirms whether the campaign generated real money after accounting for all expenses.
Practical Strategies to Improve Your Ad Return
- Increase Average Order Value (AOV): Offer bundle deals, tiered discounts, or free shipping thresholds so each ad conversion brings in more revenue.
- Optimize Store Conversion Rate: Ensure your product pages load fast, look professional, and answer customer objections clearly to maximize conversions from ad traffic.
- Calculate Smartly: Prevent manual math errors by using Gumrai's free online ROI & ROAS Calculator to analyze your campaign metrics instantly.
Frequently Asked Questions (FAQ)
1. What is a safe baseline ROAS to break even?
This depends entirely on your product's gross margins. If your margin is thin, you might need a ROAS of 4x or 5x to break even. If your product margin is high, a ROAS of 2x might still be highly profitable.
2. Why does my ad dashboard show high ROAS, but my actual bank transfers don't match?
Ad platforms track conversions based on clicks or views, which includes cancelled orders, failed cash-on-delivery shipments, or duplicate clicks. Always rely on actual reconciled bank income for bottom-line calculations.
Summary
ROAS is a great metric for ad creative and campaign optimization, but ROI measures the actual survival of your business. Monitoring both metrics carefully prevents hidden ad spend losses and keeps your shop growing sustainably.
Want to set more accurate costs and selling prices?
Try Gumrai tools to calculate profit, set prices, and manage back-office tasks to make decisions faster.