#advertising
Practical guides for online sellers: product photos, marketplace listings, video ads and growing your store.
ACoS to ROAS (2026): Formula, Conversion Table and Break-Even
ROAS = 100 divided by ACoS%. A full ACoS-to-ROAS table, the reverse conversion, break-even points and a worked Amazon example.
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TikTok Ad Sizes (2026): Video, Carousel and Profile Photo Specs
TikTok's official ad specs for in-feed video, carousel and profile photos, the safe zone, and how to turn product photos into TikTok ads.
Instagram Ad Sizes (2026): Feed, Stories, Reels and Carousel Specs
Meta's recommended Instagram ad sizes for feed, Stories, Reels, carousel and video ads, the safe zones, and how to fit one product photo to all of them.
Before-and-After Photos in Ads: Meta, TikTok and Google Rules
What Meta, TikTok and Google allow in before-and-after ads, which products are low risk, how to shoot a fair comparison, and alternatives when it's restricted.
Ad Creative Fatigue: How to Spot It and How Often to Refresh
The metrics that show an ad is tiring, Meta, TikTok and Google guidance on how many creatives to run, what to change when you refresh, and a routine for small budgets.
What Is a Good ROAS? (2026) Break-Even and Target ROAS by Margin
A good ROAS depends on your margin. A table of break-even and target ROAS by margin, two worked shop examples, and why a lower ROAS can still earn more profit.
How to Calculate ROAS (2026): Formula, Examples and ROAS vs ROI
The ROAS formula with worked examples for one campaign and several, how ROAS differs from ROI and ACoS, how to compare it with break-even ROAS, and why platform ROAS can mislead.
How to Calculate Customer Acquisition Cost (2026): CAC Formula and Examples
The CAC formula with a worked monthly example, blended vs paid CAC, how CAC relates to ROAS, how to compare it with lifetime value, and examples for small online shops.
Break-Even ROAS (2026): Formula and Examples With Fees and Shipping
The break-even ROAS formula, a full example with marketplace fees, payment processing and shipping, how returns and order size change it, and how to set a target ROAS for profit.
Facebook Ad Image Size for Products (2026): Feed, Stories, Reels and Link Ads
The right Facebook ad image size for every placement, the Stories safe zone, how much text to use, and creative tips for product ads.
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