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Inventor add-in

Calculeaf user guide · Updated 2026-08-16

The Autodesk Inventor add-in links Calculeaf math to 3D model parameters — lengths, diameters, constraints, and feature dimensions — so a change in the worksheet can update the part, and a change in Inventor can push back into the sheet. It is free, runs on Windows 64-bit, and supports Inventor 2025, 2026, and 2027. You need a Calculeaf account.

Install it from the Autodesk Marketplace (search for Calculeaf, then Get). After install, Inventor shows a Calculeaf tab with Calculeaf and Parameters.

Autodesk Inventor with the Calculeaf Parameters dialog open, showing Inputs that push width and diameter into Calculeaf and an Output that reads a value back.
Parameters in Inventor. Inputs push model values into the sheet. Outputs read a Calculeaf result back into Inventor.

Connect the add-in

  1. Open a part in Inventor and choose Calculeaf on the ribbon, then Parameters (or Calculeaf to sign in first).
  2. The add-in opens a browser window. Sign in (or create an account) and choose Authorize.
  3. That grants the add-in permission to read your worksheets and values, and to update math regions.
  4. The dialog shows Connected as your machine name. Use Disconnect there, or revoke it later under Account settings → Connected Applications.

Only one computer can be connected at a time. Authorising a new machine disconnects the previous one. Other apps on the same computer stay connected. Disconnecting immediately revokes access — reconnect from the add-in.

Copy a variable address

Each link uses the address of a saved math assignment on the sheet. In Calculeaf (browser or desktop):

  1. Sign in and save the worksheet.
  2. Right-click a math assignment (:=) and choose Copy variable address.
  3. Paste that address into the add-in’s Inputs or Outputs table.

Inputs — Inventor into Calculeaf

The Inputs table is labelled push Inventor parameters to Calculeaf. Each row is one model parameter:

  • Document — the part file (for example Part5.ipt).
  • Parameter — the Inventor name (width, diameter, and so on).
  • Current Value — the live value and unit from the model (for example 3 in).
  • Calculeaf Math Region Address — the address you pasted from the sheet.

When you refresh, Inventor writes those values into the linked assignments so the rest of the worksheet can use them.

Outputs — Calculeaf into Inventor

The Outputs table is labelled read Calculeaf values back. Add a row, give it a title, and paste an address. Inventor shows the current result and unit (for example 1873.41 lbf*ft). Use this for a reaction, a required thickness, or any other result that should drive the model.

  • Read values — pull the latest results from the sheet.
  • Remove selected — drop a row from the table.
  • Open Calculeaf — jump to the web editor.
  • Refresh — reload the connection and values.
  • Close — dismiss the dialog.

A typical loop

  1. Build the calculation in Calculeaf with named assignments for the dimensions you care about.
  2. Connect the add-in and open Parameters.
  3. Map Inventor parameters to those assignments under Inputs.
  4. Map result assignments under Outputs if the model should follow a calculated size or load.
  5. Change a value on either side, then Refresh or Read values so the other side updates.

Units travel with the number. Keep the unit system on the sheet consistent with the part (SI or USCS) so you are not converting by hand.

The same address is used by the HTTP API if you are not going through Inventor — see API tokens and Region context menu.

Walkthrough videos and the installer live on the Calculeaf Autodesk Marketplace listing. For install, account, or parameter issues, include your Inventor version, add-in version if you know it, and any error text.