ToolkitBook
Calculate Beamer slide and text area dimensions for any aspect ratio. Enter paper size and margins in millimeters, then view results in mm, pt, and inches with generated LaTeX code.
aspectratio=43), 16:9 (widescreen, aspectratio=169), 16:10, 3:2, or enter a custom ratio. Match the ratio to the display you will present on.\geometry{…} and \setlength commands.Presentation design: Before writing slides, calculate the exact text area available after margins. This helps you decide font sizes, column widths, and image placement in your Beamer template.
Custom Beamer themes: Theme developers need precise slide and text area dimensions to position decorations, sidebars, and footers accurately. Use the generated \newlength definitions in your theme file.
Academic posters and handouts: Convert slide dimensions to points or inches for use with the geometry package when creating handout layouts or poster-sized versions of Beamer presentations.
Debugging layout overflow: When text or images overflow the Beamer frame, use this calculator to compare your current margin settings against the defaults. Reducing margins by 2-3 mm increases the text area without changing the slide content.
Use 16:9 (aspectratio=169) for widescreen monitors, modern conference rooms, and online meeting platforms. Use 4:3 (aspectratio=43, the default) for older projectors or square-format screens. Choose 16:10 for certain laptops and 3:2 for Microsoft Surface devices. Match the ratio to the actual display you will present on.
They match the physical dimensions Beamer assigns internally: 128 × 96 mm for 4:3, 160 × 90 mm for 16:9, and 160 × 100 mm for 16:10. Select Custom to enter any width and height with the geometry package.
The text area equals the slide dimensions minus all four margins. The Area Ratio percentage shows how much of the slide surface remains for content. Beamer's defaults are approximately 8 mm on each side and 5 mm top and bottom, but you can adjust them to maximize or constrain your content region.
It produces a \geometry{…} command that sets paperwidth, paperheight, and all four margins — place it in your preamble after \usepackage{geometry}. It also defines \slideW, \slideH, \slideTextW, and \slideTextH via \newlength and \setlength so you can reference exact dimensions throughout your document.
All dimensions are displayed in millimeters (mm), points (pt), and inches (in). In LaTeX, 1 pt ≈ 0.3515 mm (72.27 pt per inch). The generated code uses millimeters by default, but you can convert any value using the provided unit outputs.
The Beamer Calculator computes Beamer slide and text area dimensions for any aspect ratio. Enter paper size and margins in millimeters to view results in mm, pt, and inches, plus generated LaTeX geometry commands for your preamble. It works for 4:3 legacy projectors, 16:9 widescreen displays, 16:10 laptops, 3:2 Surface devices, and custom ratios.
Calculations run in the browser with JavaScript, so no LaTeX installation is required for the calculation. The tool supports Beamer's built-in aspect ratios (4:3, 16:9, 16:10, 3:2) and custom dimensions. A visual slide preview updates as you adjust margins, showing how much content space remains.
Use the calculator when preparing academic presentations, building custom Beamer themes with dimension definitions, or creating Beamer-based posters, handouts, and multi-ratio slide decks for conferences.
Conference presentation setup: Before writing slides, calculate the exact text area available for a 16:9 widescreen room. Knowing the precise content width (e.g., 144 mm after default margins) helps you choose appropriate font sizes, set column widths, and determine image placement without trial and error.
Custom Beamer theme development: Theme authors need dimension variables for positioning sidebars, footlines, and decorative elements. Use the generated \newlength definitions (\slideW, \slideH, \slideTextW, \slideTextH) directly in .sty files for consistent spacing across all aspect ratios.
Academic poster creation: Switch to Custom paper size (e.g., A0 at 841 × 1189 mm) with minimal margins to compute the poster content region. Copy the generated geometry settings into your poster preamble.
Debugging frame overflow: When content spills outside the Beamer frame, compare your current margins against the defaults (8 mm sides, 5 mm top/bottom). Reducing margins by 2-3 mm reclaims usable text area — for a 16:9 slide, shrinking side margins from 8 mm to 5 mm adds 6 mm of content width.
Multi-ratio slide deck preparation: Presenters who carry both 4:3 and 16:9 versions of their slides can calculate text area differences for each ratio and adjust layouts or image sizing across both formats.
The table below lists the physical dimensions Beamer assigns for each built-in aspect ratio. These are the default paper sizes used by the \documentclass[aspectratio=…]{beamer} option.
| Ratio | Beamer Option | Slide Size (mm) | Slide Size (pt) | Typical Use |
|---|---|---|---|---|
| 4:3 | aspectratio=43 | 128 × 96 | 364.20 × 273.15 | Beamer default and older projectors |
| 16:9 | aspectratio=169 | 160 × 90 | 455.24 × 256.08 | Widescreen monitors and modern TVs |
| 16:10 | aspectratio=1610 | 160 × 100 | 455.24 × 284.53 | Some laptops and older widescreen projectors |
| 3:2 | aspectratio=32 | Custom | — | Microsoft Surface and similar devices |
The output includes a \geometry{…} command for paperwidth, paperheight, and margins — place it in your preamble after \usepackage{geometry}. It also provides \newlength and \setlength definitions for \slideW, \slideH, \slideTextW, and \slideTextH that you can use throughout your document for precise spacing and layout.
Beamer's default margins are approximately 8 mm on the left and right sides and 5 mm on the top and bottom. The text area — the region available for your content — is calculated by subtracting all four margins from the slide dimensions.
For example, a standard 4:3 slide (128 × 96 mm) with default margins yields a text area of 112 × 86 mm, which is approximately 78.4% of the total slide surface. Increasing margins reduces the text area proportionally; the Area Ratio percentage in the results shows how much space remains.
You can adjust margins using the \setbeamersize{text margin left=…, text margin right=…} command or the \geometry{left=…, right=…, top=…, bottom=…} package. This calculator generates the geometry-based approach, which gives you independent control over all four sides.
Match aspect ratio to your display: Always select the aspect ratio that matches the screen or projector you will use. A 16:9 presentation shown on a 4:3 projector will be letterboxed, and vice versa. When in doubt, prepare both versions.
Theme-specific margins vary: Some Beamer themes (e.g., Berkeley, Hannover) add sidebars that consume additional horizontal space. The margins you set here apply to the paper geometry — your theme may further reduce the visible text area.
Use the generated lengths in TikZ: The \slideW, \slideH, \slideTextW, and \slideTextH definitions work directly in TikZ drawings. Reference them with \the\slideTextW to get the current value or use them in coordinate calculations.
mm vs. pt in LaTeX: Beamer internally uses points (pt) for most dimensions. The calculator shows mm, pt, and inches side by side — use mm for the geometry package inputs and pt when setting font sizes or TikZ coordinates.
Copy the full preamble block: The generated LaTeX code includes both the \geometry{…} command and the custom length definitions. Copy the entire block into your preamble after \documentclass to ensure all variables are available throughout your document.
Test with the visual preview: Before finalizing your margins, check the Slide Preview. If the text area (inner rectangle) appears too small relative to the slide, consider reducing margins by 1-2 mm to gain more content space.