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JavaScript Math sum

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In JavaScript, you can use the Math object to perform various mathematical operations. To find the sum of two or more numbers, you can use the + operator.

Note: there is no built-in Math.sum() method in JavaScript. However, you can create your sum() function using the reduce() method to sum up an array of numbers.

JavaScript Math sum example

Simple example code using the + operator to find the sum of two numbers:

const a = 5;
const b = 7;
const sum = a + b;

console.log(sum); // Output: 12

Let’s create a sum() function using the reduce() method and find the sum of any array of numbers, like this:

<!DOCTYPE html>
        function sum(numbers) {
            return numbers.reduce((total, number) => total + number, 0);

        const numbers = [1, 2, 3, 4, 5];
        const total = sum(numbers);

        console.log("Array sum", total); 


JavaScript Math sum

Do comment if you have any doubts or suggestions on this JS math topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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