# Least Squares

Browse 6 online least squares tools for working with least squares calculations and data in your browser.

> Canonical page: https://elysiatools.com/en/tags/least-squares

## Overview

Explore 6 Least Squares tools for working with least squares methods and related data through a browser-based interface, with no software installation required.

## Frequently asked questions

### What can I do with Least Squares tools?

You can use the available tools to work with least squares methods and related data through your browser.

### How is my data processed?

You operate the tools in your browser, while processing runs on Elysia Tools servers. Text inputs are not stored.

### What happens to uploaded files?

Uploaded files are automatically deleted after 6 hours.

## Tools

- [Fertilizer N-P-K Blend Calculator](https://elysiatools.com/en/tools/fertilizer-blend-calculator): Compute how to mix base fertilizers to hit a target N-P-K analysis like 10-10-10. Outputs per-fertilizer kg plus a parts ratio for any batch size.
- [Least Squares Calculator](https://elysiatools.com/en/tools/least-squares-calculator): Calculate the least-squares regression line, residuals, and squared error diagnostics from paired data
- [Linear Regression Calculator](https://elysiatools.com/en/tools/linear-regression-calculator): Fit a simple least-squares linear regression model and calculate slope, intercept, R squared, and predictions
- [Multiple Linear Regression Calculator](https://elysiatools.com/en/tools/multiple-linear-regression-calculator): Fit a multiple linear regression model from rows of predictor variables and a numeric target
- [Polynomial Regression Calculator](https://elysiatools.com/en/tools/polynomial-regression-calculator): Fit a polynomial least-squares curve to paired numeric data and inspect coefficients, R squared, and predictions
- [Regression Calculator](https://elysiatools.com/en/tools/regression-calculator): Run simple linear regression on paired numeric data and inspect slope, intercept, correlation, and predictions

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