Tolerancer — tolerance stack-up checks inside Fusion 360

ToleranceCalc is an Autodesk Fusion 360 add-in that helps you quickly evaluate and compare tolerance stack-up scenarios so you can make better decisions before you commit to manufacturing.

What it does

• Calculates tolerance outcomes from the dimensions and tolerances you provide
• Supports common stack-up approaches (best‑case/worst‑case and statistical-style comparisons, where applicable)
• Shows clear results so you can see how variation affects fit, function, and assembly risk
• Speeds up iteration when you’re exploring different dimensioning strategies

Why it’s useful

When parts come off a machine, real dimensions vary. ToleranceCalc helps you understand what that variation means for your design—so you can:

• reduce surprises at assembly time
• choose tolerances that are achievable (and cost‑aware)
• document trade-offs confidently

Who it’s for

• Mechanical designers and engineers working in Fusion 360
• Makers and small shops validating fit-up before cutting parts
• Anyone doing quick tolerance checks without jumping to a separate tool

Typical use cases

• Fits & clearances (shafts/holes, sliding fits, press fits)
• Stack-ups across multiple features (spacers, brackets, fastener patterns)
• Assembly sensitivity checks (what dimension matters most)

Status

This add-in is actively maintained and will continue to improve with better workflows, clearer reporting, and expanded calculation options.