Create a JavaScript calculator from an Excel spreadsheet

Build an interactive web calculator in JavaScript from an Excel spreadsheet. Save hours of programming by using tested and trusted code libraries.

Your customer wants a simple JavaScript calculator for their website. In theory it is easy to program, however handling all possible errors, formatting the data and implementing the calculation can be rather tedious. A better solution is to create the entire calculator with Excel, and convert the Excel formulas to JavaScript using SpreadsheetConverter.

You create the calculator in Excel in no time. The machine conversion to JavaScript will be well tested, since thousands of users test our calculation engine daily. You get a fast, online JavaScript “spreadsheet” with all the features that your customers expected.

See examples of what SpreadsheetConverter can do for you.

Free offer: Send us a spreadsheet and we’ll send it back as a web page.

Photo of a Scandinavian couple frowning over a JavaScript calculator

JavaScript calculators boost sales

JavaScript spreadsheets activate your visitors and make them interact with the website. If they save time using a price calculator for a quote, or see how much they can save by refinancing a mortgage, they will return to your calculator over and over again.

A Excel JavaScript calculator is also valuable on websites without products. If you can use your fantasy to develop a useful calculator, visitors will return to your site, and spread the word about it.

Excel and JavaScript are natural matches. Your web forms can have embedded calculations and validations. The entered data is collected and made available to you. Typical examples are:

  • Expense reports: let the employees fill in expense reports online from anywhere in the world. Sums are updated directly when entered, just as they are in Excel.
  • Surveys like course evaluation
  • Order forms: Using SpreadsheetConverter is the fastest way to publish an order form on the web. Totals, sales tax, shipping is no problem.
  • Reservation forms.
  • Employment application: Web forms helps you get more structured answers.

Example: Simple JavaScript spreadsheet with live chart

Screenshot of an Excel JavaScript spreadsheet with chart

Use charts with your JavaScript calculator

See our entire Examples collection converted to JavaScript spreadsheets.


Features and benefits

SpreadsheetConverter is the perfect tool for creating calculating web forms and web pages that attract attention.

  • Instantaneous response: All calculations and validations are done immediately when the user enters new data. Everything is done in the browser. No communication with the web server.
  • Everything is live and interacting with your visitors: The calculator or form updates dynamically when values are changed. Even the charts are live! Use calendars to select dates, stars to set ratings and sliders to vary data in real-time. Create forms with dropdown menus, checkboxes, radio buttons, large text fields, list boxes in a breeze. Design step-by-step wizards for complex forms.
  • It looks so good on the web: Normally, it takes a lot of time to make a web page look this well-designed. With Excel you just format the page the way you like. SpreadsheetConverter creates a web page that looks the same: borders, colors, fonts, checkboxes, dropdown lists etc work as they should, and numbers are formatted on the fly with decimals, thousand separators and currency symbols. Play with new layouts inside Excel before you convert them to web format, which saves lots of time (besides being lots of fun). Design colorful themes the give your online spreadsheets a common look.
  • All devices supported: the calculator or web form automatically adapts to the small screen in a smartphone or tablet, to look and work well on any device.
  • Two or more team members can share the same spreadsheet: collaborate with your colleagues in real-time to create and analyze calculating forms and web pages.
  • The Link Image widget allows you to show different images in the web page depending on cell values or formulas. Now you can build advanced imaging applications where an image on the screen changes with the values in a web form or calculator.
  • Automatic form-to-Inbox delivery: When users submit completed forms, SpreadsheetConverter delivers them directly to your e-mail Inbox. For a small fee, forms can be saved in a database for later retrieval, thanks to a hosted service that requires no local installation or server.
  • Users can include up to ten files with any form they submit. Job applicants can include their CV, and expense reports can include scanned copies of receipts.
  • It’s so easy to change: Business rules frequently change, e.g. new prices, new discount options, new regulations etc. With hand-crafted web pages it’s hard to keep up with the frequent changes. With SpreadsheetConverter, you just change the spreadsheet, and regenerate the web page.
  • Scalable: Once the web page is downloaded into the visitor’s web browser, no resources are needed on the web server. So if your current website can handle 1,000 simultaneous visitors, a calculator you create with SpreadsheetConverter can be used by 1,000 simultaneous visitors.
  • You get the source code: The web page is completely self-contained. There are no library files or other external requirements.
  • There are no errors: The calculator doesn’t need any testing, since thousands of users already have tested our calculation engine.
  • It’s cost-effective: You need the SpreadsheetConverter program only when you perform the actual conversion from spreadsheet to web page format. You need one license for each PC on which you install the program to perform such conversions.
  • Excel isn’t needed: Once the web page is created, Excel is not required. Your web server doesn’t need Excel, and your users don’t need Excel. Even if Excel is all around, not all employees have it, and private persons seldom have it.
  • It’s free to distribute: With the Professional Edition, you can make the calculator part of a product that you sell.
  • You take no risk: Every purchase comes with a 30-day money-back guarantee and six months of free e-mail support.

SpreadsheetConverter is a unique product

Only SpreadsheetConverter HTML works on all web servers, since we do the calculations using JavaScript. JavaScript is always supported.

Only SpreadsheetConverter has royalty-free distribution. No extra per-server fees.

Fast calculation with prefabricated components

Creating a calculating web page like an expense report or order form online can be very difficult. Programming, testing and debugging takes a lot of time even for a specialist. Most online calculators do all their calculation on the web server, which can make the web page slow because of all the network communication with the server.

With SpreadsheetConverter, all your spreadsheet formulas are automatically converted into program code by SpreadsheetConverter, using prefabricated components that have been meticulously tested. The conversion to web format retains the interactivity that is typical of a spreadsheet, and the entire visual layout is carried over to the web page.

Our basic product converts Excel spreadsheets to HTML with embedded JavaScript that can be used with any web server. All calculations are performed in the browser, without any help from the web server. SpreadsheetConverter can also generate HTML5 web applications for iPhone and Android smartphones. This makes it easy to collect data with mobile devices, select or configure products or do spreadsheet calculations in a smartphone.

Special server products generate program code for Node.js, ASP.NET and classic ASP web servers. Since these flavors keep the formulas on the server and perform all calculations there, the business formulas are hidden from the end user. Running the formulas on the server also makes it much easier to add back-end integration, for example for saving and restoring values to a database. Communication with the server is minimal and the web calculator updates itself quietly in the background while the user is busy entering data into another cell.

Superior support

We guarantee the best support. Six months of e-mail support is included in the price for all products. We promise answers by the next business day, but within an hour is our goal.

SpreadsheetConverter is a mature product that has been for sale since 2002. We constantly add new value to the product. Updates are free within the same major version, so if you buy any version 8 product, all 8.x updates are free. If we release a new major version within six months from your purchase, the upgrade to the new version will not cost you anything.

Low cost, no risk

We recommend that you start with the Standard edition of SpreadsheetConverter HTML to learn the basics. As you become confident in your ability to generate web pages from Excel, you can add more “flavors” – technical publishing environments – to your toolset.

For serious publishing business, the Professional Edition lets you create web pages for clients, supports all the most nerdy Excel functions and provides even more beautiful chart types.

Here is the complete price list:

License to generate HTML pages$127$247
License to generate pages for iPhone/Android$167$327
License to generate pages for Node.js$187$357
License to generate pages for ASP.Net$187$357
Cost per page$0$0
Cost per server$0$0
Cost per visitor$0$0

Excel and SpreadsheetConverter are only used when you create the spreadsheet and convert it to web format. We charge a small one-time license fee for each computer on which you install the program to perform such conversions.

  • There are no additional fees per page or conversion.
  • There are no additional fees per web server, page view or visitor.
  • There are no additional fees for Excel or plug-ins. The web pages we create have everything in them and do not need or use Excel.

In fact, when spreadsheets are available online like this, many people no longer need their own Excel licenses, which can generate additional savings.


There is no risk, you’re safely protected by our 30-day money-back guarantee. If you are not satisfied with your purchase, just send us an e-mail, and we will cancel your purchase and refund the money.

Let us convert a spreadsheet for you, right now!

We’ll gladly convert one of your own spreadsheets for you. It’s so simple to do, we won’t even charge you anything for it. It won’t take us much time anyway.

If you like the result, we hope you’ll want to install the program and take it for a test drive in your own laptop.

E-mail us one of your spreadsheets right now!

Download and try the program for free for 30 days

Download the trial version and try it for free for 30 days. At that point, you still enjoy a 30-day full no-questions-asked refund, so in total you can test the software for up to 60 days!

Before you try converting one of your own spreadsheets we recommend that you follow one of our simple tutorials and convert an example file.

Technical requirements

SpreadsheetConverter normally doesn’t require anything special. If you have a reasonably current version of Excel running in a Windows PC, you’re probably good to go.

For an overview of the various flavors of SpreadsheetConverter and their exact technical requirements, please study the product comparison chart.

Build live website calculators and web forms now!

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Just download, install and test the Excel add-on now. Or let us convert a spreadsheet for you, for free.