Last updated: July 31, 2026
Error Function Calculator
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Formula
erf(x)≈sign(x)[1−(a1t+a2t^2+a3t^3+a4t^4+a5t^5)e^(−x^2)], t=1/(1+px)
Where:
- x=x
Worked Examples
At x=0
Worked scenario for this calculator.
- 1Enter the input values.
- 2Apply the calculator formula.
- 3Read the computed outputs.
At x=1
Worked scenario for this calculator.
- 1Enter the input values.
- 2Apply the calculator formula.
- 3Read the computed outputs.
At x=-1.5
Worked scenario for this calculator.
- 1Enter the input values.
- 2Apply the calculator formula.
- 3Read the computed outputs.
Introduction
Approximate the Gaussian error function erf(x) using the Abramowitz-Stegun 7.1.26 polynomial-rational approximation.
Formula and Method
Error Function Calculator uses: erf(x)≈sign(x)[1−(a1t+a2t^2+a3t^3+a4t^4+a5t^5)e^(−x^2)], t=1/(1+px)
Enter the required inputs.
Apply the mathematical relationship.
Compute each output key directly.
Round numeric results for stable display.
Input Fields
Use these input keys exactly as shown in the calculator form.
- 1
x: x
Output Fields
These are the outputs returned by the calculation.ts implementation.
- 1
result: result
Validation Rules
Validation prevents undefined math states and invalid numeric input.
x must be a finite number.
Errors are returned with safe default outputs when validation fails.
How to Use This Calculator
Follow a simple input → calculate → interpret workflow.
Fill in all required fields.
Click calculate.
Check the primary output first.
Use examples to verify manual work.
Practical Uses
This calculator supports both learning and quick technical checks.
Homework and exam prep.
Classroom demonstrations.
Engineering/science sanity checks.
Rapid what-if analysis with new inputs.
FAQs
What does the Error Function Calculator compute?
Approximate the Gaussian error function erf(x) using the Abramowitz-Stegun 7.1.26 polynomial-rational approximation.
Which inputs are required?
Required inputs are all fields marked required in the form. Optional fields can be left blank.
How are invalid inputs handled?
The calculator validates numeric rules first and returns an error message with safe default outputs when rules are violated.
Are results rounded?
Numeric outputs are rounded to about 6 decimal places for stable and readable display.
Can I use decimals?
Yes, decimals are supported unless an input requires integers (such as index, count, or theorem parameters).
Can I use this to verify manual solutions?
Yes. Use the formula section and worked examples to cross-check hand calculations quickly.