Statistics & Surveys Tools — Free Calculators | Blackridge Research

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Statistics & Surveys Free Calculators & Tools

Sample size, margin of error, NPS, Likert scores, and statistical significance.

10 free tools
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Most-used calculators

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S
Popular
Sample Size Calculator

How many survey responses do you need? Cochran's formula with finite population correction.

Statistics & Surveys Use tool

All Statistics & Surveys tools

10 tools available

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Popular
Sample Size Calculator

How many survey responses do you need? Cochran's formula with finite population correction.

Statistics & Surveys Use tool
M
Margin of Error Calculator

What precision did your sample actually buy? Compute the ± on any survey result.

Statistics & Surveys Use tool
C
Confidence Interval Calculator

Build the interval around a proportion or a mean — the range the truth plausibly occupies.

Statistics & Surveys Use tool
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Survey Response Rate Calculator

Measure response and completion rates, and size the outreach a target sample requires.

Statistics & Surveys Use tool
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Survey Duration Calculator

Estimate how many days of fieldwork a target sample will take at your outreach pace.

Statistics & Surveys Use tool
N
NPS Calculator

Compute Net Promoter Score from response counts, with margin of error and benchmarks.

Statistics & Surveys Use tool
L
Likert Score Calculator

Turn a 5-point response distribution into mean score, top-2-box, and a readable verdict.

Statistics & Surveys Use tool
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Research Budget Calculator

Build a defensible market research budget from sample, incentives, and analysis effort.

Statistics & Surveys Use tool
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Research ROI Calculator

Value research as decision insurance: what is reducing the risk of a wrong call worth?

Statistics & Surveys Use tool
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Statistical Significance Calculator

Two-proportion z-test: is the difference between two percentages real or noise?

Statistics & Surveys Use tool

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