Abs Value Calculator
Absolute Value Calculator works out Absolute value and Rounded absolute value from What to calculate, Value and Compare with. The default figures on this page give absolute value of 7.5; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
1 step
- -7.5 is negative, so |-7.5| = -(-7.5) = 7.5.
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Absolute Value Calculator calculates
Evaluates absolute values and absolute differences, evaluates |ax + b| at a point, solves absolute-value equations by splitting the two sign cases, and solves absolute-value inequalities into an interval.
How to use this Absolute Value Calculator
Enter What to calculate, Value, Compare with and Coefficient a (of x). Absolute value updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Absolute value, Rounded absolute value and Expression.
The method follows NIST Digital Library of Mathematical Functions, 1.2 Elementary Algebra (absolute value and the triangle inequality) and Sullivan, Algebra & Trigonometry, Appendix A.1 and Section 1.6 (equations and inequalities involving absolute value).
Absolute value of -7.5 example
With What to calculate: value, Value: -7.5, Compare with: 0, the calculator returns Absolute value: 7.5, Sign of the input: -1. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Absolute value, Rounded absolute value and Expression. The inputs you can vary are What to calculate, Value, Compare with, Coefficient a (of x), Constant b and Right-hand side c.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to do absolute on a calculator?
Evaluates absolute values and absolute differences, evaluates |ax + b| at a point, solves absolute-value equations by splitting the two sign cases, and solves absolute-value inequalities into an interval. Open “How this is worked out” beside the result to see each step for your own figures.
How do you calculate an absolute?
It needs What to calculate, Value, Compare with, Coefficient a (of x), Constant b and Right-hand side c. Nothing else is required, and the figures stay in your browser.
What is the absolute value of 25?
On the figures this page opens with — value -7.5 and compare with 0 — the absolute value is 7.5. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What's the absolute value of |- 2?
Evaluates absolute values and absolute differences, evaluates |ax + b| at a point, solves absolute-value equations by splitting the two sign cases, and solves absolute-value inequalities into an interval. On this page it is computed from What to calculate, Value and Compare with and shown as Absolute value, Rounded absolute value and Expression.
What information do I need for the Absolute Value Calculator?
You need What to calculate, Value, Compare with, Coefficient a (of x), Constant b, Right-hand side c, Comparison and Decimal places. The page opens with default figures that give absolute value of 7.5, so you can see the scale before entering your own.
What does this Absolute Value Calculator show?
It shows Absolute value, Rounded absolute value, Expression, Sign of the input, Signed value, First solution, Second solution and Solution, with the working and any warnings for your entries.