Z-Score Calculator Online - Free Browser Tool

Delimiterdetected: ","

Column

Outlier |z| ≥

Input CSVCSV64bytes

Z-scores CSVCSV

score,z_score,outlier
72,-0.0160,no
85,0.5037,no
91,0.7435,no
40,-1.2951,no
77,0.1839,no
82,0.3837,no
98,1.0233,no
79,0.2638,no
12,-2.4144,yes
88,0.6236,no

Mean72.40

Std dev25.02

Values10

Outliers1

Value	Z-score	Flag
72.00	-0.016
85.00	0.504
91.00	0.744
40.00	-1.295
77.00	0.184
82.00	0.384
98.00	1.023
79.00	0.264
12.00	-2.414	outlier
88.00	0.624

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

What is Z-Score Calculator?

Z-Score Calculator is a free, browser-based tool that helps you tidy up and standardize messy datasets. Per-row z-scores for any numeric column with outlier highlights. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

How to use Z-Score Calculator

1Paste or drop your data.
2Pick the cleaning rules to apply (the tool previews what changes).
3Copy or download the cleaned result.

Features

Previews changes before you apply them
Handles empty cells safely (never silently zeroed)
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Profiling an unfamiliar dataset before analysis
Quick one-off cleaner jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Frequently asked questions

How do I use Z-Score Calculator?: Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Per-row z-scores for any numeric column with outlier highlights.
Is my data uploaded or stored anywhere?: No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
Is Z-Score Calculator free?: Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.
What's the maximum file size?: There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.
Do I need to install anything?: No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.

Value

Z-score

Flag

72.00

-0.016

85.00

0.504

91.00

0.744

40.00

-1.295

77.00

0.184

82.00

0.384

98.00

1.023

79.00

0.264

12.00

-2.414

outlier

88.00

0.624

What is Z-Score Calculator?

Features

Previews changes before you apply them

Handles empty cells safely (never silently zeroed)

100% client-side — no upload, fully private

Free with no account, no watermark, and no daily limit

Works on large inputs, limited only by your device's memory

Load a sample, then copy, download, or share your result

Frequently asked questions

How do I use Z-Score Calculator?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Per-row z-scores for any numeric column with outlier highlights.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is Z-Score Calculator free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.