absolute value on a calculator

What does absolute value mean?

Absolute value tells you how far a number is from zero on the number line. Distance is always non-negative, so absolute value is never negative.

• |8| = 8
• |-8| = 8
• |0| = 0

If you remember one rule, remember this: absolute value removes the sign, not the magnitude.

How to do absolute value on a calculator

There are several ways depending on your calculator model. Most scientific and graphing calculators include an abs( function.

On TI-83 / TI-84 calculators

• Press MATH.
• Move to the NUM menu.
• Select abs(.
• Type your number or expression and close the parenthesis.
• Press ENTER.

Example: abs(-27) gives 27.

On Casio scientific calculators (fx series)

• Look for Abs in the function menu (often under OPTN, SHIFT, or CATALOG depending on model).
• Insert Abs(.
• Type the value inside parentheses.
• Press =.

On phone and computer calculators

Some default calculator apps do not show abs in basic mode. Switch to scientific mode (rotate phone sideways, or open scientific view) and look for absolute value, modulus, or abs(.

Common examples

• |-125| = 125
• |14.2| = 14.2
• |-0.75| = 0.75
• |-3 + 10| = |7| = 7

Common mistakes students make

1) Confusing absolute value with negative sign

Absolute value is not “make everything negative.” It is the opposite: the result cannot be negative.

2) Forgetting parentheses

Use parentheses around full expressions. For example, type abs(-3+1) instead of just abs -3+1. Parentheses prevent order-of-operations errors.

3) Mixing up vertical bars and parentheses

In math writing, absolute value is shown with vertical bars: |x|. On calculators, this is usually entered as a function: abs(x).

Why absolute value matters

Absolute value appears in algebra, statistics, physics, finance, and coding. Anytime you care about size or distance but not direction/sign, absolute value is useful.

• Distance between two numbers on a line: |a - b|
• Error magnitude in measurements
• Price change size, regardless of increase/decrease
• Signal processing and optimization problems

Quick FAQ

Can absolute value ever be negative?

No. It can be zero or positive only.

What is the absolute value of a decimal?

Same rule. Remove the sign only. Example: |-2.36| = 2.36.

Is absolute value the same as modulus?

In many calculator menus, yes for real numbers. You may see the function labeled as abs or mod depending on context.

Final tip

If your calculator returns an unexpected result, check three things first: sign, parentheses, and mode. Then try the calculator above to verify the answer quickly.