Free Tools

Plan better experiments, starting now

15 free calculators used by CRO specialists and marketing teams to plan ads, measure performance, and optimize conversions. No signup. No tracking. Runs entirely in your browser.

A/B Test Sample Size Calculator

Stop guessing how much traffic you need. Enter your baseline conversion rate and minimum detectable effect — get the exact sample size for a valid test.

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A/B Test Duration Calculator

Know exactly when to call your test. Input your daily traffic and goals — see how many days you need before results are trustworthy.

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Statistical Significance Calculator

Did your variant actually win? Paste your control and variant numbers — get a clear confidence level and p-value in seconds.

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CRO ROI Calculator

Prove the revenue impact of optimization work. Enter your traffic, conversion rate, and projected lift — see the monthly and annual dollar impact.

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Cart Abandonment Calculator

Find out how much revenue you're leaving on the table. Calculate your abandonment rate and see how much you can recover with targeted interventions.

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UTM Campaign Link Builder

Build trackable campaign URLs in seconds. Add source, medium, and campaign tags — copy the link and paste it into your ads, emails, or social posts.

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CPC Calculator

Find your cost per click from total ad spend and clicks. Compare your CPC against Google Ads, Facebook, and other platform benchmarks.

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CPM Calculator

Calculate your cost per thousand impressions. Plan display, social, and video ad budgets with accurate CPM estimates by platform.

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CTR Calculator

Calculate your click-through rate from clicks and impressions. Benchmark your CTR against industry averages for ads, email, and organic search.

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ROAS Calculator

Measure your advertising profitability. Enter revenue and ad spend to calculate your return on ad spend ratio and break-even point.

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Conversion Rate Calculator

Find your exact conversion rate in seconds. Enter visitors and conversions — see your rate with industry benchmarks to know where you stand.

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Engagement Rate Calculator

Calculate your engagement rate for Instagram, TikTok, YouTube, and more. See how your rate compares to platform-specific benchmarks.

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Cookie Consent Impact Calculator

Find out how much of your website data is invisible. Calculate how many visitors, conversions, and dollars your analytics misses due to cookie banners and ad blockers.

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Customer Acquisition Cost Calculator

Calculate how much it costs to acquire each new customer. Enter your marketing and sales spend — see your CAC and LTV:CAC ratio.

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Customer Lifetime Value Calculator

Calculate how much revenue each customer generates over their lifetime. See your LTV and LTV:CAC ratio to evaluate growth sustainability.

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AI Search Visibility Checker

See if your site shows up in AI search results. Check your visibility across Perplexity and other AI engines for up to 5 target keywords.

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AI A/B Test Ideas Generator

Enter any URL and get AI-powered A/B test recommendations with specific hypotheses, expected impact, and implementation details. Bring your own API key.

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Go beyond calculators

Run the tests these tools help you plan.

Humblytics combines visual A/B testing, heatmaps, funnel analytics, and agent-powered recommendations — so you can go from calculating sample sizes to launching winning experiments in minutes.