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Both calculators run independently — change the inputs on either side to compare results.

Margin of Error Calculator

Find the margin of error for a survey proportion at a chosen confidence level. Tells you how far a poll result might be from the true population value.

Sample Size (people)

Sample Proportion (%)

Z-Score (1.96 = 95%)

Statistics

Z-Score Calculator

Convert any raw value into a z-score — the number of standard deviations it sits above or below the mean of its distribution. Used everywhere from standardised test reporting and quality control to risk modelling and machine-learning feature scaling.

Value (X)

Mean (μ)

Standard Deviation (σ)

Key differences

	Margin of Error Calculator	Z-Score Calculator
Category	Statistics	Statistics
Inputs required	3	3
Result	Margin of Error (%)	Z-Score
What it does	Find the margin of error for a survey proportion at a chosen confidence level. Tells you how far a poll result might be from the true population value.	Convert any raw value into a z-score — the number of standard deviations it sits above or below the mean of its distribution. Used everywhere from standardised test reporting and quality control to risk modelling and machine-learning feature scaling.