Online Calculator Curve Fitting

Regression Calculator

Online calculator for curve fitting with least square methode for linear, polynomial, power, gaussian, exponential and fourier curves. Adaptation of the functions to any measurements.

Different functions can be adapted to data with the calculator: linear curve fit, polynomial curve fit, curve fit by Fourier series, curve fit by Gaussian distribution and power law curve fit. Through the selection of further fit functions the functions are added to the chart. The style of the functions and points can be selected by means of the style information.

The screenshot function allows to copy the diagram to an image. From the image it is possible to store or print the diagram.

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Standard
deviation

Linear

Gaussian

Power law

Exponential

Polynomial

e-Function

e^2-Function

Fourier

σ =

Axes ranges

x-min=

x-max=

y-min=

y-max=

Linear:

f (x) = a + b \cdot x

Gaussian:

f (x) = \frac{1}{σ \sqrt{2 π}} e^{- \frac{1}{2} \frac{{(x - μ)}^{2}}{σ^{2}}}

Power law:

f (x) = a \cdot x^{b}

Exponential law:

f (x) = a \cdot b^{x}

Polynomial:

f (x) = a_{0} + a_{1} \cdot x + a_{2} \cdot x^{2} + ...

e-function:

f (x) = b \cdot e^{a \cdot x}

Fourier series:

f (x) = \frac{a_{0}}{2} + \sum_{k = 1}^{n} (a_{k} cos (k ω x) + b_{k} sin (k ω x))

Square e-function:

f (x) = a \cdot e^{b \cdot {(x + c)}^{2}}

Points:

Label:

Load from file:

Number of points =

An alternative input is possible with load data from file. The values may be separated comma or space or semicolon. The values must be given pairwise x₁,y₁,x₂,y₂...

Parameter of the fitted curves

Here are the calculated parameter of the least square fitted curves.

Linear Line curve fit

Power Law curve fit

Exponential Law curve fit

Gauss Function curve fit

Polynomial curve fit

e-function curve fit

Square e-function curve fit

Fourier curve fit

Fourier parameter:

Screenshot of the image

Print or save the image via right mouse click.

Releated sites

Here is a list of further useful sites:

Index Regression Linear Power Gaussian Fourier Polynomial Fitting Gaussian distribution Mean Value Calculator Fourier series calculator

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elsenaju Mathe Tutorial: Online calculator for curve fittingOnline calculator for curve fitting with least square methode for linear, polynomial, power, gaussian and fourier. Adaptation of functions to any measurements.The calculator requires activated Java-Script in the browser.