Crafting a digital tool that not only simplifies mathematical computations but also seamlessly preserves each calculation's outcome for future reference. This innovative creation is a web-based calculator, meticulously designed using the trifecta of web development: HTML, CSS, and JavaScript. Through an elegant interface crafted in HTML, users can input their mathematical expressions effortlessly. Meanwhile, CSS adorns this interface, ensuring it not only functions smoothly but also dazzles with visual appeal. But the real magic happens behind the scenes, within the realm of JavaScript. Here, the calculator's logic is encoded, allowing it to process user inputs, perform the desired mathematical operations, and display the results promptly. But the brilliance doesn't stop there. This calculator goes a step further by integrating with a backend system. Once a calculation is executed, the result is diligently dispatched to the backend, ensuring it's securely archived for future retrieval and analysis. This harmonious fusion of frontend elegance and backend robustness culminates in a powerful yet user-friendly tool, poised to revolutionize how mathematical tasks are tackled in the digital age.

The interface looks like this:

Performing a basic calculation would give results like this:

Result: