What you can calculate
Not a single-formula widget — a real gear design tool covering geometry, rating and AI-assisted design. The free tier includes a daily allowance of calculations across all three modes.
Gear geometry
Module, profile shift, addendum modification, tip and root diameters, centre distance and mesh — base geometry per DIN 3960 / ISO 21771.
ISO 6336 rating
Bending and pitting safety factors for spur and helical steel gears, Method B (2019), with the full K-factor breakdown.
VDI 2736 plastic rating
Root load capacity for thermoplastic gears with Method C and modified Method B, using temperature-dependent material strength.
AI design mode (limited)
Give targets and bounds and let the optimizer propose a standards-compliant geometry instead of hand-iterating.
What "free" means here
Straightforward and honest — no hidden install, no credit card to run a calculation. See the documentation for the full breakdown.
- Sign in in seconds. A quick sign-in keeps your calculations with you; there's nothing to download or license.
- Free tier calculation modules. Run real geometry and rating calculations on the free tier right away — not a locked demo.
- Upgrade only when you need more. The paid plan removes the daily limits and adds CSV/STEP export and 3D CAD generation; you move up only if and when it helps.
Why this gear design tool
Runs in your browser
No install, no license server — open a tab on any machine and start calculating.
Traceable to the standard
Every result maps to a clause of ISO 6336 or VDI 2736 — not an unlabelled black-box number.
Fast enough to iterate
A rating runs in about 100 ms with a live cross-section render, so you can tweak and recalculate freely.
Frequently asked questions
Is the gear design tool really free?+
Yes — there's a free tier with a daily allowance of calculations and project saving. Sign in in seconds and start right away; the paid plan removes the limits and adds CSV/STEP export and 3D CAD generation.
Do I need to install anything?+
No. It runs entirely in your browser — there's nothing to download and no license server to maintain.
What can it calculate?+
Gear geometry (DIN 3960 / ISO 21771), ISO 6336 bending and pitting rating for steel gears, and VDI 2736 rating for plastic gears — plus an AI mode that proposes a design from your targets.
Does it handle helical gears?+
Yes — external spur and helical cylindrical gear pairs, with profile shift and tip-diameter modifications. Internal gear pairs are on the roadmap.
Are the results standards-compliant?+
Yes. Ratings follow ISO 6336 (Method B, 2019) and VDI 2736, and every value maps to a clause of the standard.