The Perk runs a development program for middle managers. I built their Middle Manager ROI Calculator as a HubSpot custom module on a dedicated landing page, with a gated report download behind a HubSpot form.
Page editor. Scoring and rate fields the marketing team edits directly in HubSpot, beside a live preview of the calculator.
The live calculator with the same formulas as the HubSpot module. Change the inputs, then run it to see the results update.