Sample Size Calculator

Important: To get accurate results you must reload the page before changing any numbers.

Confidence Level %

Statistical Power %

Baseline Conversion Rate (Control Offer) %

Total Number of Daily Visitors

Number of Offers Including Control

Daily Number of Visitors per Offer

Lift (that can be detected with power (80%) probability)	{{lift \| percentage}}	%
Absolute Difference in Conversion Rate (that can be detected with power (80%) probability)	{{absoluteDifferenceInConversionRate(lift) \| percentage:2}}	{{absoluteDifferenceInConversionRate(inputsAsDecimal.customLift) \| percentage:2}}
Conversion Rate of Alternative (that can be detected with power (80%) probability)	{{conversionRateOfAlternative(lift) \| percentage:2}}	{{conversionRateOfAlternative(inputsAsDecimal.customLift) \| percentage:2}}
Sample Size per Offer (# of visitors)	{{sampleSizePerOfferInVisitors(lift) \| number:0}}	{{sampleSizePerOfferInVisitors(inputsAsDecimal.customLift) \| number:0}}
Sample Size per Offer (# of conversions)	{{sampleSizePerOfferInOffers(lift) \| number:0}}	{{sampleSizePerOfferInOffers(inputsAsDecimal.customLift) \| number:0}}
Days to Complete Test	{{daysToCompleteTest(lift) \| roundUp}}	{{daysToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}
Weeks to Complete Test	{{weeksToCompleteTest(lift) \| roundUp}}	{{weeksToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}

Correct for Multiple Offers (Bonferroni Correction)

Bonferroni-corrected Confidence Level

Confidence Level %

Statistical Power %

Total Sales (Control Offer) $

Sum of Sales Squared (Control Offer) $

Number of Visitors (Control Offer) $

RPV $

Total Number of Daily Visitors

Number of Offers Including Control

Daily Number of Visitors per Offer

Lift (that can be detected with power (80%) probability)	{{lift \| percentage}}	%
Absolute Difference in RPV (that can be detected with power (80%) probability)	{{absoluteDifferenceInRpv(lift) \| currency:2}}	{{absoluteDifferenceInRpv(inputsAsDecimal.customLift) \| currency:2}}
RPV of Alternative (that can be detected with power (80%) probability)	{{rpvOfAlternative(lift) \| currency:2}}	{{rpvOfAlternative(inputsAsDecimal.customLift) \| currency:2}}
Sample Size per Offer (# of visitors)	{{sampleSizePerOfferInVisitors(lift) \| number:0}}	{{sampleSizePerOfferInVisitors(inputsAsDecimal.customLift) \| number:0}}
Days to Complete Test	{{daysToCompleteTest(lift) \| roundUp}}	{{daysToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}
Weeks to Complete Test	{{weeksToCompleteTest(lift) \| roundUp}}	{{weeksToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}

Correct for Multiple Offers (Bonferroni Correction)

Bonferroni-corrected Confidence Level

Lift (that can be detected with power (80%) probability)	{{lift \| percentage}}	%
Absolute Difference in Conversion Rate (that can be detected with power (80%) probability)	{{absoluteDifferenceInConversionRate(lift) \| percentage:2}}	{{absoluteDifferenceInConversionRate(inputsAsDecimal.customLift) \| percentage:2}}
Conversion Rate of Alternative (that can be detected with power (80%) probability)	{{conversionRateOfAlternative(lift) \| percentage:2}}	{{conversionRateOfAlternative(inputsAsDecimal.customLift) \| percentage:2}}
Sample Size per Offer (# of visitors)	{{sampleSizePerOfferInVisitors(lift) \| number:0}}	{{sampleSizePerOfferInVisitors(inputsAsDecimal.customLift) \| number:0}}
Sample Size per Offer (# of conversions)	{{sampleSizePerOfferInOffers(lift) \| number:0}}	{{sampleSizePerOfferInOffers(inputsAsDecimal.customLift) \| number:0}}
Days to Complete Test	{{daysToCompleteTest(lift) \| roundUp}}	{{daysToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}
Weeks to Complete Test	{{weeksToCompleteTest(lift) \| roundUp}}	{{weeksToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}

Lift (that can be detected with power (80%) probability)	{{lift \| percentage}}	%
Absolute Difference in RPV (that can be detected with power (80%) probability)	{{absoluteDifferenceInRpv(lift) \| currency:2}}	{{absoluteDifferenceInRpv(inputsAsDecimal.customLift) \| currency:2}}
RPV of Alternative (that can be detected with power (80%) probability)	{{rpvOfAlternative(lift) \| currency:2}}	{{rpvOfAlternative(inputsAsDecimal.customLift) \| currency:2}}
Sample Size per Offer (# of visitors)	{{sampleSizePerOfferInVisitors(lift) \| number:0}}	{{sampleSizePerOfferInVisitors(inputsAsDecimal.customLift) \| number:0}}
Days to Complete Test	{{daysToCompleteTest(lift) \| roundUp}}	{{daysToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}
Weeks to Complete Test	{{weeksToCompleteTest(lift) \| roundUp}}	{{weeksToCompleteTest(inputsAsDecimal.customLift) \| roundUp}}