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A/B Test Significance

The A/B Test Significance Calculator determines whether your test has reached statistical significance, accounting for sample size, conversion rate difference, and one-sided vs two-sided hypotheses. Stops bad tests early, extends good ones appropriately.

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Updated 2026
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A/B Test Significance
Two-tailed Z-test for proportions
Your test data
Variant A (Control)
CVR
2.50%
Variant B (Test)
CVR
3.30%
95% confidence — ship it
Observed Lift
+32.0%
Confidence Level
98.3%
P-value
0.0171
Statistical Significance
✓ Yes
Current sample size
10,000
Estimated sample needed
6,094
What to do

Standard significance threshold met. Ship B, but run for another week if business cycles matter (weekends, paydays, etc).

Running a CRO program?

Our CRO engagements produce 3-5 significant winners per quarter with disciplined testing.

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How to use

Get value from the A/B Test Significance in 3 steps.

01

Enter your numbers

Input current metrics — no signup, no data saved to servers. Everything runs in your browser.

02

Get instant analysis

Results update live as you change inputs. See verdicts, benchmarks, and context, not just raw numbers.

03

Act on the output

Follow the "What this means" recommendations. Share with your team or bring to your next strategy review.

Use cases

When to use the A/B Test Significance.

1

Determine when to call an A/B test

2

Pre-test: calculate required sample size

3

Audit existing tests for premature conclusions

4

Set minimum detectable effect for future tests

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Free Keyword Difficulty Checker 2026

Estimate how hard it is to rank for any keyword. Free, instant, no signup. Based on competitor analysis and SERP factors.

Check keyword difficulty

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Want a free audit of 10 keywords for your business?

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How this calculator works

Our keyword difficulty checker combines 4 factors to estimate ranking difficulty:

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Results are estimates. For precise data, use tools like Ahrefs or Semrush — or request our free audit above.

Understanding the difficulty score

0-30
Easy — New sites can rank within 3-6 months with quality content and basic SEO.
30-50
Moderate — Requires solid SEO foundation, 6-12 months of consistent effort.
50-70
Hard — Need established domain, strong backlinks, comprehensive content. 12-18 months minimum.
70-100
Very Hard — Dominated by big brands. Consider long-tail variations instead.
WANT IT DONE FOR YOU?

The A/B Test Significance is free.
The full analysis is not.

Our CRO & Analytics service takes this to the next level — full audit, strategic roadmap, and senior operators executing the work. Starts at $6k/month, quarterly contracts.

FAQ

A/B Test Significance
questions.

Got more? Ask us →

Yes — 100% free, no signup, no email wall. We built it because our operators needed it and decided to share.

No. All calculations run entirely in your browser. Nothing is sent to or stored on any server.

Reach out — we will share an embed snippet for teams that want to use this inside their own workflows.

Yes. No signup required, no data collected, nothing sent to our servers. Everything runs in your browser. We publish free tools because they build trust with operators who might eventually hire us — that's the entire business model.

The math is correct and the formulas are standard. The output is only as good as the inputs you provide — garbage in, garbage out applies here like anywhere. We recommend calibrating with at least 3 months of real data before making major decisions based on the results.

The tool lives at a stable URL that you can share with your team. We don't currently offer embeds, but the output is shareable via the copy button on calculator results. For white-label or embedded versions, contact us directly.

Three reasons. First, they help operators make better decisions even if they never hire us. Second, they let us show our thinking publicly — the frameworks behind these tools come straight from our client engagements. Third, they attract the kind of operators who later become great clients.

The free tools cover standard scenarios. For custom analysis — multi-channel attribution, cohort LTV modeling, MMM — we do this as part of paid engagements. Our CRO & Analytics service starts at $6k/month and includes custom dashboarding plus BigQuery setup if needed.

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