How do I add a list of numbers?

Simply paste your list of numbers into the input box. The calculator supports numbers separated by commas, spaces, or newlines. Click 'Calculate' to see the sum instantly.

Can I calculate negative numbers?

Yes, standard negative numbers (e.g., -5, -10.5) are fully supported and will be subtracted from the total sum.

Is there a limit to how many numbers I can add?

This tool is designed to handle thousands of numbers efficiently. For browser performance reasons, extremely large datasets (millions of numbers) might take a moment to process.

Add Numbers Online & Sum Calculator

The fastest way to add numbers and calculate the sum of any list. Free, secure, and mobile-friendly.

Enter your numbers below:

Paste data from Excel, CSV, or text documents.

Basic Calculator

Use this Sum Calculator to instantly find the total, average, and count of any dataset. Supports up to 10,000 numbers with any delimiter.

How to Use the Sum Calculator

Our Add Numbers tool is the easiest way to compute the summation of any list. Whether you are adding a column of numbers from Excel, summing a list of prices, or calculating a total count, simply paste your values below.

Acceptable Data Formats

This Sum Calculator is smart enough to handle various formats:

Format Type	Input Example	Result
Comma Separated	`10, 20, 30, 40`	Total: 100
Column (New Lines)	`10 20 30`	Total: 60
Text & Numbers	`Item A: $50 Item B: $25`	Total: 75

Input Numbers: Type or paste your numbers into the text box. The tool acts as a powerful number adder by ignoring text.
Calculate: Click "Calculate Sum".
Get Results: Instantly see the Total Sum, Mean, and Count.

What is a Sum Calculator?

A Sum Calculator (or Summation Calculator) is a mathematical tool designed to find the total of a sequence of numbers. Summation Formula (Sigma) Sum = x₁ + x₂ + x₃ + ... + xₙ \sum x i It is commonly used for: Statistics: Calculating the Arithmetic Mean. Finance: Adding up expenses or receipts. Data Processing: Counting the number of items in a list.

Frequently Asked Questions

How do I add numbers from a column?

Simply copy the column from your spreadsheet (Excel, Google Sheets) and paste it into our Sum Calculator. It automatically handles the newlines.

Is this a free Sum Calculator?

Yes, AddNumbers.net is 100% free and supports unlimited calculations.

Can I add negative numbers?

Yes, standard negative numbers (e.g., -50) are supported.

Does it work on mobile?

Absolutely. The interface is optimized for mobile devices, making it easy to add numbers on the go.