Inequality Number Line Calculator

Graph inequalities and interval notation on a number line with open or closed endpoints and shaded solution ranges.

836.3K uses Updated · 2026-05-09 Runs locally · zero upload
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How to Use Inequality Number Line Calculator

The Inequality Number Line Calculator turns simple inequalities and intervals into a visual number line. Enter x > 2, x <= -1, -3 < x < 4, or [1, 5). The result panel shows interval notation, a number line graphic, standardized text, and the rule used for endpoints.

The calculator supports negative numbers, decimals, fractions, one-sided inequalities, bounded inequalities, and infinity intervals. If the input cannot be parsed, it shows a friendly example.

Formula & Theory - Inequality Number Line Calculator

The Inequality Number Line Calculator follows standard graphing rules.

strict inequality = open circle; inclusive inequality = filled circle; shade every value in the solution set

For x > 3, the graph starts at an open circle on 3 and shades to the right. For 1 <= x <= 5, both endpoints are filled and the segment between them is shaded.

Use Cases for Inequality Number Line Calculator

Use the Inequality Number Line Calculator for algebra practice, classroom demonstrations, homework checking, interval notation review, and helping students connect symbolic inequalities to visual solution sets.

Frequently asked questions about Inequality Number Line Calculator

Can I enter interval notation?

Yes. Inputs such as [1, 5), (-∞, 3], and x in [1, 5) are supported.

What do open and filled circles mean?

Open circles mean the endpoint is excluded. Filled circles mean the endpoint is included.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.