ToolGrid AIZ-Score Calculator
Calculate how many standard deviations a value is from the mean.
Runs entirely in your browser — your selected files are not uploaded by this tool. Device-provided speech voices may use online services.
About this free z-score calculator tool
Calculate how many standard deviations a value is from the mean. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
A practical example
A concrete example uses value: 85; mean: 70; standard deviation: 10. The result is Z-score: 1.5.
Before you rely on the result
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result.
Frequently asked questions
Is the z-score calculator free to use?
Yes. The Z-Score Calculator is free, needs no account and has no usage limit beyond what your device can handle.
Are my files or numbers uploaded anywhere?
No. The Z-Score Calculator runs in your browser, so the values and files you enter stay on your device. Close the tab and nothing is kept.
What does the z-score calculator do?
Calculate how many standard deviations a value is from the mean. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
When should I double-check the result?
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result.
Can I share my result?
Yes. Use Copy result or Download, and on calculator-style tools use Copy share link to send someone a link that opens with the same inputs filled in.