Fence Alignment Calculator: Dial Indicator Difference

Use this tool to convert front and back dial indicator readings into a clear fence alignment interpretation: parallel, slight toe-out, or a toe-in condition.

Calculator

How to measure fence alignment

1. Unplug the saw before setup work.
2. Confirm the blade is already aligned to the miter slot if you are using the miter slot as the reference.
3. Lock the rip fence in the position you want to check.
4. Mount the dial indicator so it rides consistently from one reference side.
5. Zero the indicator at the front measurement point.
6. Move to the back measurement point without changing reference sides.
7. Enter the front and back readings into the calculator.
8. Repeat the check after unlocking and relocking the fence to test fence repeatability.

Use the same reference side for both readings. Do not measure the front from the blade and the back from the miter slot. Mixed references make the result meaningless.

What the result means

Nearly parallel: The front and back readings are close enough that the calculator does not flag a meaningful alignment direction. This does not prove the saw is perfectly tuned; it only means the measured difference is small.

Slight toe-out: The back of the fence is slightly farther from the reference than the front. Some setup practices tolerate a very small amount of toe-out, but WoodGearLab should not recommend intentionally toeing the fence out unless the saw manual or fence manufacturer allows it.

Toe-in: The back of the fence is closer to the reference than the front. This is the reading to treat most seriously because it can reduce clearance as the board exits the cut and may increase the chance of pinching.

Related WoodGearLab guides

• Table Saw Fence Accuracy
• Table Saw Blade Alignment
• Kickback Mechanics