Is this calculator specific to Shopify?

The math is ecommerce-specific and works especially well for Shopify stores because it includes the costs Shopify merchants usually need to model: COGS, payment fees, shipping, returns, ad spend, inventory, conversion rate, or repeat purchases depending on the tool.

Should I use gross margin or contribution margin?

Use contribution margin when you are making advertising, discount, or growth decisions. Gross margin is useful, but contribution margin is stricter because it accounts for variable costs like payment fees, fulfillment, shipping, returns, and app costs.

Why does the tool use default values?

Defaults make the calculator useful immediately and show the shape of the result before you enter your own numbers. Replace them with your store's actual numbers before making a final decision.

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Creative Testing Calculator

Estimate how many visitors and purchases are needed to declare an ad creative or landing page test winner.

Creative testing calculator

Estimate how much traffic and how many purchases you need before calling a Meta, TikTok, or landing-page creative winner.

Baseline conversion rate

Minimum lift worth detecting

Daily visitors per variant

Visitors per variant

16,773

Purchases per variant

462

Total visitors

33,546

Estimated test length

34 days

Variant CVR target

Use this before declaring a winner after a handful of purchases. Small lifts require much larger samples than most ad tests collect.

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About this tool

What this free tool calculates

Use this before killing or scaling creatives based on tiny samples. It estimates visitors and purchases per variant for a statistically useful read.

How to use the result

The calculator uses a two-proportion sample-size estimate with 95% confidence and 80% power based on baseline conversion rate and minimum detectable lift.

If the sample requirement is larger than your budget, test bigger creative differences or use the result as directional rather than final.

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Why the calculator stays input-driven

This free ecommerce tool does not guess demand, scrape competitors, or invent benchmarks. Change the numbers to match your store, then use the result to decide whether a product, campaign, discount, or inventory move is worth doing.

Frequently Asked Questions

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