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In 2017, 90% of organizations with FDA approved clinical trials used nQuery for sample size calculation

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nQuery is the world's most trusted sample size calculation software

20+ Years
#1 Trusted sample size calculation
& power analysis software

50k Users
Commercial, Academic &
Government organizations

Successful Trials
Recognized by the FDA, EMA &
other agencies 
for it's performance

nQuery - Powering Sample Size

Leading through statistical innovation for over 20 years -
nQuery is the world's most trusted sample size and power analysis software.

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Regulatory Approval

Consistently calculate the appropriate sample size for FDA/EMA submission

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Reduce Risk
& Cost of Clinical Trials

Frequentist & Bayesian techniques to optimize your clinical trial design

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Powerful Sample
Size Options

Rapidly calculate sample size and conduct power analysis for a multitude of scenarios

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Share & Empower
Your Team

Easily calculate and then communicate the findings to your team and non statisticians
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Intuitive Sample Size
& Power Calculator

Calculate sample size and conduct a power analysis with a clean & easy to use interface

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Enabling successful sample size determination for clinical trials

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All the features you need in sample size software

Created by sample size experts, nQuery boasts an extensive list of features for sample size calculation and power analysis. This is why it is the #1 choice for Researchers and Biostatisticians worldwide.

  • 100’s of validated sample size tables & procedures, with results outputted in the correct regulatory format

  • Customizable plotting functionality, Side-tables and extra tools increase speed and accuracy of calculations

  • Clean spreadsheet style interface allows you easily demonstrate and share knowledge to non statisticians


Popular Sample Size Resources

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15 Ways To Reduce Sample Size
In Clinical Trials


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Power and Sample Size Calculations for Survival Analysis - Webinar

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