How to Insert a Mathematical Fraction in Microsoft Word

When writing academic papers, engineering reports, or mathematical documents in Microsoft Word, you often need to display complex fractions (like ½, ¾, or algebraic expressions like x/y) in a proper, vertical format rather than a messy horizontal line. While you can rely on Word’s auto-format feature to shrink basic fractions like 1/2, inserting complex variables or multi-line equations requires the use of the built-in Equation Editor.

Method 1: The Equation Editor (Best for Complex Math)

If you need to insert an algebraic fraction or a fraction containing complex symbols, you should use the dedicated Equation tool.

1. Open your Microsoft Word document and place your cursor exactly where you want the fraction to appear.
2. Click on the Insert tab located on the top ribbon menu.
3. Look to the far right side of the ribbon and click the Equation button (it has a Pi symbol icon). A blank equation box will appear in your document.
4. A new, temporary Equation ribbon tab will open at the top of the screen.
5. In the “Structures” section of this ribbon, click the Fraction button.
6. A dropdown menu will appear showing different layouts (Stacked, Skewed, Linear, etc.). Choose the Stacked Fraction (the first option) for a traditional vertical layout.
7. Two small dotted boxes will appear in your equation. Click the top box to type your numerator, and click the bottom box to type your denominator.

Method 2: The Keyboard Shortcut (Fastest for Simple Math)

If you do not want to constantly click through menus, you can trigger the Equation Editor instantly using a keyboard shortcut and a simple syntax trick.

1. Press and hold the Alt key, then press the = (Equals) key. This instantly inserts a blank equation box.
2. Type your fraction using a forward slash. For example, type a/b or 3/4.
3. Immediately after typing the denominator, press the Spacebar once.

As soon as you press the Spacebar, Word’s math engine will automatically intercept the forward slash and convert the horizontal text into a properly formatted, stacked vertical fraction.

Method 3: The Ink Equation Tool (For Touchscreens)

If you are using a Microsoft Surface or an iPad with a stylus, you can literally draw the fraction.

1. Go to Insert > Equation.
2. At the bottom of the dropdown menu, select Ink Equation.
3. A yellow canvas will appear. Use your mouse or stylus to hand-write the fraction. Word will preview its digital translation at the top of the box.
4. Click Insert to place the converted math into your document.