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Confidence Interval Calculator

Normal approximation: mean ± z × SD/√n. Not a Student-t interval; small or nonnormal samples need a suitable method. Results use floating-point arithmetic; verify inputs and units.

confidence-interval-calculatorLOCAL WORKSPACE

Enabling local controls…

Inputs and settings

Processed in this tab without uploading or storing inputs. Each text field is limited to 32 KiB and complete output to 1 MiB; additional format and model limits apply.

Results

Review the settings and run. Editing inputs clears old results.

Processing model and limits

Normal approximation: mean ± z × SD/√n. Not a Student-t interval; small or nonnormal samples need a suitable method.

Data and model checked: NIST statistical methods ↗Source tool controls ↗

How to use this tool

Load the example, confirm field units and processing rules, then run locally. Editing any input clears the old result. Copy or download the complete output explicitly.

When not to use it

Normal approximation: mean ± z × SD/√n. Not a Student-t interval; small or nonnormal samples need a suitable method.