About Us

Welcome to Combination Sum Calculator, a simple calculator designed to solve combination related mathematical problems. Whether you're a student learning mathematics, a developer experimenting with different algorithms, or just someone curious about patterns and combinations, this calculator helps you quickly find all possible combinations of values that add up to a target sum.

The Story Behind Combination Sum Calculator

The idea for this project came from a very simple moment. While playing Killer Sudoku, I was looking for possible number combinations that could add up to a certain total. Naturally, I thought — is there a tool online that can do this?

I did find a few calculators, and they worked fine for small numbers. But whenever I entered larger numbers, almost every site froze or crashed. As a developer myself, I became curious: why does this site keep crashing?

After digging deeper, I discovered the problem. Most calculators used a naïve brute-force algorithm with exponential time complexity (O(2ⁿ)). For example, with just 50 candidate numbers, they were trying to check over 1 quadrillion combinations (2⁵⁰) — which will crash any browser.

Since many users often want to work with large numbers and complex sets, I decided to build a solution that wouldn’t break. By combining two smarter techniques — Dynamic Programming and Backtracking — I was able to design a calculator that efficiently handles very large inputs.

Now, anyone can enter big numbers and multiple candidates without worrying about crashes. For instance, if the target sum is 251 and the candidate numbers are:

3, 7, 12, 18, 21, 25, 29, 30, 33, 36, 38, 40, 42, 45, 47, 49, 50, 52, 55, 57, 59, 60, 61, 63, 65, 66, 68, 70, 73, 75, 78, 80, 83, 85, 87, 90, 92, 95, 97, 99, 100, 103, 105, 108, 110, 115, 120, 123, 127, 130

— most calculators would fail. But this Combination Sum Calculator can still find all valid, unique combinations smoothly.

This challenge — and the solution — became the motivation for starting this project. My goal was simple: create a tool that is reliable, efficient, and user-friendly so that anyone can explore number combinations without limits and of course without crashing😅.

The Developer Behind This Site

Hola! I'm Niraj Kumar, the passionate developer behind Combination Sum Calculator. With a background in Computer Science, I've always been fascinated by the power of Internet that have impacted the mankind.

I believe Internet is one of the best invention done by homo sapiens. That’s why I dedicate myself to tackling real-world challenges through code, crafting solutions that matter.

I am interested in a lot of different areas of life. When I'm not coding or designing new tools, you can find me playing a soprano recorder/kalimba or making illustrations.

I also like to solve puzzles and develop web games in my free time.

Thank you for visiting our site, and we will keep bringing new projects which solves real world problems.

Adiós