---
title: G43, G43.1, G49 (Tool Length Offset)
slug: g43-g431-g49-tool-length-offset
docTags: 
createdAt: 2023-04-18T11:15:28.000Z
---

1. To use the tool offset of the tool in the spindle use `G43`. This assures that always the tool length of the tool in the spindle is compensated.
2. To use a tool length offset from the tool table, program `G43 H...`, where the H number is the desired index in the tool table. ( H = 1-99)
3. To use dynamic tool compensation (not from the tool table), use `G43.1 I... K...` where `I...` gives the tool X offset (turning) and `K...` gives the tool Z offset (for turning and milling)

:::hint{type="warning"}
Warning: If you use option 2 or 3, the tool-length compensation will not adapt to the new tool after `M6T…`
:::

To have no tool length offset compensation, program `G49`

[Variables](docId\:oqHjs3LLCfQkSac_cemc2) `#5401` to `#5499` is the tool length of tool 1-99

Variables `#5501` to `#5599` is the tool diameter of tool 1-99

Variables `#5601` to `#5699` is the tool x-offset (width for turning) offset.

The variables can be modified runtime (in the G-Code file) if needed to compensate for tool-wear.