Ad calculators · 100% free
A/B Test Statistical Significance Calculator
Calculate statistical significance (z-test) for A/B test results, visitors, conversions, declared winners.
CRO Optimizely VWO
Control (A)
Variant (B)
Borderline (90%)
94.00% confidence
A CR
4.200%
B CR
4.750%
Relative lift
+13.10%
Z-score
1.881
P-value
0.0600
Lower = stronger evidence
About this tool
Z-test for proportions. Enter visitors + conversions for control and variant, get p-value, lift, and confidence-level pass/fail.
More free tools
See all tools → Ad calculators
Poshmark Fee Calculator
Calculate Poshmark seller commission, 20% over $15 or flat $2.95, and true net per sale.
Ad calculators
Amazon TACoS Calculator
Calculate Amazon Total Advertising Cost of Sales (TACoS), ad spend ÷ total Amazon revenue.
Ad calculators
Facebook Marketplace Fee Calculator
Calculate Facebook Marketplace shipping fees, 5% per shipment (min $0.40), and net proceeds.
Ad calculators
Simple Interest Calculator
Calculate simple interest on a principal, annualised, monthly or any term.
Free forever · No card
Why wait? Try it free today.
Stop managing feeds manually. Start optimising with AI in 30 seconds.
- 100% free forever, no credit card required
- 1 brand, 1 feed, 100,000 products per feed
- Full AI Product Optimisation, Rule Engine, and 200+ channel exports
- Pay only for AI credits when you need them