# Rendering Units

## Content

The rendering APIs use two unit systems:

| API | Unit | Based on |
| --- | ---- | -------- |
| `Render` rectangle (`x`, `y`, `width`, `height`) | Points | 1/72 inch |
| `BitmapGraphicsRendering`, `SvgGraphicsRendering`, `SvgRendering` dimensions | Pixels | 1/96 inch |

Use `C1XLBook.TwipsToPixels` to convert points to pixels:

```csharp
int widthPx = C1XLBook.TwipsToPixels(20 * widthInPoints);
```

`C1XLBook.TwipsToPixels` is available in the `C1.Excel` namespace. In the .NET Standard build, it uses a fixed 96 DPI, so the conversion is `pixels = points × 96 / 72` (equivalently, `twips / 15`).

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