Statistics & Surveys
Sample size, margin of error, NPS, Likert scores, and statistical significance.
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Most-used calculators
All Statistics & Surveys tools (10 tools)
Sample Size Calculator
PopularHow many survey responses do you need? Cochran's formula with finite population correction.
Margin of Error Calculator
What precision did your sample actually buy? Compute the ± on any survey result.
Confidence Interval Calculator
Build the interval around a proportion or a mean — the range the truth plausibly occupies.
Survey Response Rate Calculator
Measure response and completion rates, and size the outreach a target sample requires.
Survey Duration Calculator
Estimate how many days of fieldwork a target sample will take at your outreach pace.
NPS Calculator
Compute Net Promoter Score from response counts, with margin of error and benchmarks.
Likert Score Calculator
Turn a 5-point response distribution into mean score, top-2-box, and a readable verdict.
Research Budget Calculator
Build a defensible market research budget from sample, incentives, and analysis effort.
Research ROI Calculator
Value research as decision insurance: what is reducing the risk of a wrong call worth?
Statistical Significance Calculator
Two-proportion z-test: is the difference between two percentages real or noise?
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Market Research
Market sizing, TAM/SAM/SOM, CAGR, penetration, and customer lifetime value.
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Finance & Investment
NPV, IRR, DCF, payback period, working capital, and financial ratios.
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Construction Intelligence
Construction costs, concrete volume, steel weight, project timeline, and crane capacity.
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Energy & Utilities
Solar ROI, wind energy, battery storage, energy conversion, and carbon emissions.
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Manufacturing & Supply Chain
Manufacturing capacity, OEE, takt time, inventory turnover, and lead time.
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Economics & Impact
Economic impact, employment multiplier, GDP impact, cost-benefit analysis, and site selection.
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Blackridge Research publishes syndicated market reports, runs custom research engagements, and tracks construction, infrastructure, and energy projects worldwide.