5 Best Free Online Log Graphing Calculator Services

Here is a list of the best free online log graphing calculator services. A log graphing calculator takes a log function as input and plots a graph of it along with the solution. Calculating a log function manually and plotting it on a graph take time with proper knowledge of logarithmic functions. Whereas using an online calculator is much easier and fast.

This post covers 5 free services where you can graph logarithmic values and functions. Some of these calculators support various mathematical functions that you can add and plot. These calculators can plot multiple functions together and help you analyze data to get the slopes and intercept trends. Whereas some calculators are limited to logarithmic functions only. These types of calculators take the function or value as input and provide its solution along with a graph. You can go through the post to check these out in detail.

My Favorite Online Log Graphing Calculator

GeoGebra.org is my favorite service to calculate log graphing online. It is hands down the best online platform to graph any type of mathematical equation, visualize data, and simulate functions. You can add and plot multiple equations and data points and use the built-in tools to analyze slopes. areas, and more.

You can check out our other lists of the best free Online Log Calculator Websites, Websites with Antilog Calculator Online, and Online Geometric Mean Calculator Websites.

Comparison Table:

NameLog GraphingMulti-FunctionSave Graph


GeoGebra.org is an online graphic calculator where you can plot mathematical equations and visualize other data. It has an interactive interface that combines algebra, geometry, and calculus tools to create mathematical models and graphs. You can use it for log graphing. To do that, select the algebra function you want to use from the left side of the screen and paste your equation there. It has an on-screen keypad that you can use to enter mathematical operators with ease. You can add any number of equations one after another and visualize them all together. Furthermore, you can customize the grid, measurements, axis, draw, and polygons, and save the resulting graph.


  • Multiple options to label and customize the grid.
  • Options to set desired axis measurements and colors.
  • Option to visualize modular functions with animation.
  • On-screen keypad to easily type mathematical operators.
  • Allow graphing multiple equations and offers tools to analyze the cross-sections and areas.
  • It allows you to save, print, embed, and download (as an image) the graph.

Final Thoughts:

With the collection of tools, you can use GeoGerbra to identify patterns and relationships in their data. Additionally, you can also calculate the slope and intercept of their trend lines.

Pros Cons
Supports a wide range of operators and functions
Can plot multiple functions together
Customization options for grid and slopes
On-screen keypad with math operators
Offers tools to analyze slopes and cross-section areas
Can animate functions modular functions
Multiple options to save the graph


Desmos.com is an online graphing calculator. It is an interactive tool that you can use to make graphs, explore functions, and visualize data. It has a side panel from where you can select the type of graph you want to make. You can also start with a blank graph if you like. In the case of log graphing, you can go with the “Log & Exponential Graph“. Then you can simply add the log equation there and it plots that on the grid. You can add multiple equations to plot them together. Along with that, you can customize grid and axis measurements. And if you want to save your graph, you can use the share icon from the top right corner. This offers a link, print, download image, and embed code options for the graph.


  • All-in-one graphing tools for mathematical equations and functions.
  • Option to set customized data range for the axis.
  • On-screen keypad to easily type mathematical operators.
  • Can visualize multiple equations together.
  • Option to add and re-position images on the graph.
  • Link, print, export image, and embed code options to save the graph.

Final Thoughts:

Desmos is an interactive tool where you can easily visualize mathematical equations, functions, and tabular data. Along with the data, it also lets you add quotes and images to the graph.

Pros Cons
Supports various mathematical functions
On-screen keypad with math operators
It can plot multiple equations on the same grid
On-screen keypad with math operators
Lets you save, export, and share the plotted graph


Mathway.com offers another free online graphing calculator where you can graph log and other mathematical functions. This calculator has a similar interface to the calculators covered above. Most of the screen is the grid where it shows the graph. On the left side of the screen, you get a list of math functions that you can graph. You can select the “Graphing” option from there and then add your equations on the screen to make a log graph. You can add multiple equations to plot them together on the same grid. That way you can use this calculator to graph log functions.


  • It can visualize multiple equations together.
  • On-screen keypad with math operators.
  • Supports various math topics.

Final Thoughts:

Mathway has a simple-to-use graphing calculator that you can use for a variety of Math and Physics functions. It does not offer any customization or save options but you can easily visualize multiple functions together.

Pros Cons
Can easily plot various graphing functions No option to save the graph
Offers an on-screen keypad with math operators
It can also plot multiple equations on same grid


MedCalc.org has a free LOG function calculator that you can use for online log graphing. This calculator has a predefined Logarithm function LOG(x) that returns the logarithm of the positive number x to base 10. You can enter the value of the x into the calculator and get the result. Along with the result, it gives you a graph of the function. You can set the range of each axis and re-plot the graph to get the desired output. This calculator does not offer a direct way to save the graph. But you can download it as an image from the right-click context menu.


  • Simple calculator to graph LOG(x) functions with base 10.
  • Option to set customized data range for the axis.

Final Thoughts:

MedCalc has a simple log graphing calculator that can help you find any LOG(x) value and plot a graph for it.

Pros Cons
Works with simple logarithmic values No direct option to save graph
Limited to the logarithm of the positive number x to base 10


RapidTables.com is another free website with an online log graphing calculator. This calculator is similar to the one you get on MedCalc but with multiple log base options. You can use it for log with base 2, 10, and e. You can set the log base and then enter the value into the calculator. Apart from numbers, you can also add equations. With that, it gets you the solution of the entered log function along with a graph. You can copy the result but there is no direct option to save the graph. However, you can download it as an image using the “save as image…” option from the right-click context menu.


  • Simple calculator to graph LOG(x) functions with base 2, e, and 10.
  • Offers additional log expression and anti-log calculators.

Final Thoughts:

RapidTables.com offers three calculators to calculate log, log expression, and anti-log. All these calculators are simple to use and get you the solution along with a graph.

Pros Cons
Graphs Log values, functions, and anti-log Does not provide an option to save the graph
Log values are limited to base 2, e, 10

Frequently Asked Questions

To do logarithms on a graphing calculator, you can use the log function that is built into the calculator. The exact steps may vary slightly depending on the model of your calculator.

To do logarithms on a TI-84 graphing calculator, you can use the built-in log function. Press the "Log" button on your calculator. Enter the value or expression you want to take the logarithm of. If you want to specify a base other than 10, enter the base after a comma. Then press the "Enter" key to calculate the logarithm.

Yes, you can use logarithms on Desmos! Desmos is a powerful online graphing calculator that can handle a wide variety of functions, including logarithmic functions.

The formula for calculating logarithms on a calculator depends on the base of the logarithm. Here are the general formulas for common logarithms (base 10) and natural logarithms (base e): log(base 10) x = log(x), ln x = log(base e) x, and so on.

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