# Choose how multi-line sign height is measured

Choose whether a Fixed Height size measures each line or the letters, and see how the space between lines changes the total height of a multi-line sign.

- Source URL: https://www.signcustomiser.com/help/pricing-and-sizing/17607066-choose-how-multi-line-sign-height-is-measured/
- Markdown URL: https://www.signcustomiser.com/help/pricing-and-sizing/17607066-choose-how-multi-line-sign-height-is-measured.md
- Category: Pricing and Sizing Models
- Last updated: 2026-10-15

## Article

Use this setting to choose what the height value means for a sign with more than one line. You can measure each line, or you can measure the letters. Use it when you or your manufacturer give the sign size as a letter height.

## Before you start

-   Make sure that your customiser uses the **Simple Letter** model. Advanced Letter and Frame Fit customisers do not have this setting.

-   Make sure that the size uses the **Fixed Height** size strategy. For more about sizes, read [Sizes – Simple Letter Model](../../pricing-and-sizing/configure-your-simple-letter-model-customiser-core-setup/).

## The two options

<table role="presentation" style="border: 1px solid #c6c9c0; border-radius: 6px; border-collapse: separate; border-spacing: 0;"><tbody><tr><td style="padding: 8px;"><p class="no-margin">Option</p></td><td style="border-left: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">What the height value means</p></td><td style="border-left: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">Total height of the sign</p></td></tr><tr><td style="border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin"><b>Line height</b> (default)</p></td><td style="border-left: 1px solid #c6c9c0; border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">The full height of each line</p></td><td style="border-left: 1px solid #c6c9c0; border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">Number of lines × height per line</p></td></tr><tr><td style="border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin"><b>Letter height</b></p></td><td style="border-left: 1px solid #c6c9c0; border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">The height of the letters</p></td><td style="border-left: 1px solid #c6c9c0; border-top: 1px solid #c6c9c0; padding: 8px;"><p class="no-margin">More than number of lines × letter height when the font line spacing is normal or wide. The space between lines is added. With tight line spacing, such as 0.5, the total can be less.</p></td></tr></tbody></table>

Example: a sign has three lines. The height value is 7 inches.

-   With **Line height**, the sign is 21 inches high (3 × 7).

-   With **Letter height**, the sign is more than 21 inches high when the font line spacing is normal or wide. The space between the lines adds to the height. The font line spacing sets this space.

-   With tight font line spacing, such as 0.5, the sign can be less than 21 inches high.

A sign with one line has the same size with both options. It has no space between lines.

## Choose the measurement for a size

1.  In the **Sign Customiser** admin, click **Customisers**.

2.  Select your customiser.

3.  In the left-hand menu, go to **Core Setup** → **Sizes**.

4.  Click **Add Size**. To change a size, click that size.

![The Sizes page of a Simple Letter customiser with the Add Size button above the size table](/help/intercom-docs/help-centre-images/d57bf13b4033163812f5425a78c31e8e181d9185162544984663e5395514c124.png)

1.  Enter a **Label**, for example "7 inch letters".

2.  In **Size Strategy**, select **Fixed Height - Width scales dynamically**.

3.  Under **Multi-line height measurement**, select one option:

    -   **Line height — total height is lines × height per line**

    -   **Letter height — add the spacing between lines to the total**

![The Size Strategy card with Fixed Height selected and the Multi-line height measurement options, Line height selected](/help/intercom-docs/help-centre-images/df2c860fcb20c4ed6b364bc8eb2f92984c5e1aa1bfb2aa075adaed3454c26fe8.png)

1.  Enter the height. The field name shows the unit of your Store, for example **Height per line (centimetres)**. With **Letter height**, the field is **Letter height (centimetres)**. On an inch Store, the unit is **inches**. The value must be more than 0.

2.  Optional: with **Letter height**, enter a value in **Border per edge (centimetres)**. To use the default border from the Sizes page, leave the field empty. The border is part of the size.

![The Size Strategy card with Letter height selected, showing the Border per edge field and the note that Letter height changes the size shown to customers and sent for manufacturing](/help/intercom-docs/help-centre-images/374bf69638ccc5d211a9ef8777eae091a54c14aadb80ad46ddc909e1f4ba8efe.png)

1.  Set the other fields, such as **Lines of text** and the character limits.

2.  Click **Save**.

Existing sizes stay on **Line height** until you change them.

### Generate a label

With **Letter height** selected, click **Generate label** to fill the **Label** from the height. For 7 inches, the label is "7 inch letters". The button works only when **Letter height** is selected, the **Label** is empty and the height is more than 0.

## What your customers and your manufacturer see

Your choice sets the size that customers see in the customiser. It also sets the size that goes to manufacturing. With **Letter height** and normal or wide font line spacing, a sign with more than one line is taller and wider than with **Line height** at the same value. With tight line spacing, the sign can be smaller. The letters keep their proportions.

With **Letter height**, you can let customers type an exact letter height. First save a size with **Letter height**. The **Sizes** page then shows an **Exact letter height** section. In that section, select **Allow customers to enter an exact letter height**. Then click **Save** on the **Sizes** page. The price then uses the next configured letter-height tier at or above the typed value.

## Limits

-   You can choose this setting only for a size in the Simple Letter model with the **Fixed Height** size strategy.

-   With normal or wide font line spacing, **Letter height** makes multi-line signs larger than **Line height** at the same value. With tight line spacing, the signs can be smaller. If your customiser uses Sheet pricing, the area-based sheet price changes with the final size of the sign. Sheet pricing applies only to letter-height sizes.

-   The font sets the space between lines. To change it, read [Change A Font's Line Height / Line Spacing](../../customise/change-a-font-s-line-height-line-spacing/).

## Related articles

-   [Sizes – Simple Letter Model](../../pricing-and-sizing/configure-your-simple-letter-model-customiser-core-setup/)

-   [Getting Started with the Simple Letter Model](../../pricing-and-sizing/getting-started-with-the-simple-letter-model/)

-   [Change A Font's Line Height / Line Spacing](../../customise/change-a-font-s-line-height-line-spacing/)