Engineering calculations
you can put your name on.
50 standards-based mechanical calculators — gears, bearings, shafts, beams, fatigue, welds, pipe flow. Every result cites the standard behind it, or says plainly when it is an engineering estimate. PDF report in one click.
No credit cardAll 50 tools during the trialCancel anytime
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Engines written to international standards
Why engineers keep it open
Built for the number you have to defend
A calculator is easy. A calculation someone else can check — with the clause, the assumptions and a report attached — is the hard part. That is the part this does.
The standard is named, every time
Each result says which clause it came from — ISO 6336 for gear tooth stress, ISO 281 for bearing life, VDI 2230 for preload. Where a panel is an engineering estimate rather than a coded standard, it says so on the panel instead of implying a standard it does not run.
A report you can hand over
One click turns any calculation into a branded PDF with inputs, results, the governing standard and the generated sketch — the deliverable your reviewer, client or file actually needs.
Answers while you type
No submit button, no waiting. Change a diameter and the stress, the safety factor and the chart all move together, so you can size by feel and still land on a defensible number.
Your work stays put
Save a calculation, group it into a project workspace, reopen it months later with every input restored, or hand a colleague a read-only share link.
50 tools · 9 domains
Everything a mechanical engineer sizes in a week
Open any of them right now — the first 30 minutes need no account and no card.
How it works
From blank input to signed-off report
Pick the calculator
50 of them, grouped by 9 engineering domains. Search by tool, by part or by standard.
Enter what you know
Sensible defaults, real material data and unit switching are already there — you fill in the geometry and the loads.
Take the result with you
Read the verdict, check the governing clause, then export the PDF, save it to a project or share the link.
An AI assistant that
already read your numbers.
Not a chatbot bolted onto a marketing page. It sits inside the calculator, sees the inputs and results in front of you, and answers in terms of your design and the standard governing it.
- Context-awareKnows your safety factor, your stresses, your material — so the answer is about this design, not an example.
- Standard-citedPoints at ISO 281, ISO 6336, VDI 2230 — whichever standard the tool you are in actually runs.
- Across the suiteShaft, bearings, gears, fatigue, pressure vessels, heat exchangers — it follows you tool to tool.
Fair use: Core 10, Pro 20, Expert 50 questions per hour.
6205 · 2 kN · 1450 rpm · L10 = 4 200 h
Is 4 200 h enough?
Typical industrial-machinery guidance is L10 ≥ 5 000 h. At 2 kN you are 16% short. Step up to a 6305 — C ≈ 23.4 kN takes L10 to roughly 18 000 h.
Your calculators,
inside your CAD.
The Copilot add-in reads the geometry you have selected, asks for the loads CAD cannot know, and runs the numbers through the same validated engines behind the calculators. Numbers only — your model never leaves your machine.
- Reads your selectionFaces, parameters, mass — as numbers, never as your file.
- Runs the real engineThe same server-side engines behind all 50 calculators.
- Numbers-onlyYour CAD model stays on your machine, by contract.
Selection read · Ø80.0 / L46.0 mm
Will this pin hold 12 kN?
Steady load, bronze bush? Running the bearing engine…
22.61 MPa vs 25.0 · SF 1.11× · thin margin
Pricing
One subscription, the whole suite
Every paid plan starts with a 14-day free trial of everything. No credit card to begin, and you can cancel from your account page at any time.
Structural references & GD&T tools
Free forever — no card, no expiry
Create free account- Unit converter & reference library
- Steel sections calculator
- GD&T calculator
- Tolerance stack-up
- Comparison mode
- Unlimited calculations
Every engineering calculator
or $15/mo billed annually ($180/yr)
Start free trial- Everything in Free
- All 50 engineering calculators
- AI Engineering Assistant (10 q/hr)
- Save calculations, project workspaces & history
- Branded PDF reports
- Public read-only share links
- Material database & sensitivity charts
Calculators + the Design Studio
or $29/mo billed annually ($348/yr)
Start free trial- Everything in Core
- Fluid-power, P&ID & electrical schematic editors
- AI Engineering Assistant (20 q/hr)
- Cross-tool workflow linking
- Email support
- Early access to new tools
API access & professional scale
or $49/mo billed annually ($588/yr)
Start free trial- Everything in Pro
- AI Engineering Assistant (50 q/hr)
- Full REST API access (self-serve keys)
- CAD add-in — Fusion 360 (coming soon), then Inventor & SolidWorks
- Dedicated priority support
Need the full feature-by-feature comparison? Open the pricing page
Questions
Before you sign up
Can I try it without a credit card?+
Yes — two ways, both card-free. Anyone can preview the whole suite for 30 minutes with no account at all. Create a free account and you get a 14-day trial of all 50 calculators and the schematic editors; nothing is charged when it ends.
What happens when the trial ends?+
You keep permanent access to the free-tier tools — unit converter, reference library, steel sections, GD&T, tolerance stack-up and comparison mode. Your saved calculations stay in your account whether or not you subscribe.
Which standards do the engines implement?+
39+ ISO, DIN, EN, ASME and IEC standards across the suite — ISO 6336 gears, ISO 281 bearing life, VDI 2230 bolted joints, EN 1993 steel and weld fatigue, ASME B31.3 pipe stress and more. Each panel names the standard it applied; where a calculation is an engineering estimate rather than a coded standard, it carries an estimate badge instead of implying one.
Is this a substitute for a professional engineer?+
No. The engines are built to be conservative and standards-traceable, and the reports are made to be reviewed — but the results are engineering aids, not a stamped design. Final responsibility stays with the qualified engineer signing the work.
Metric or imperial?+
Both. There is a global metric / US-customary toggle and every engine computes in SI internally, so the display unit never changes the answer. Imperial display is being rolled out calculator by calculator — a few panels still label their fields in SI only.
Can I cancel any time?+
Yes. Subscriptions are monthly or annual and are managed from your account page — cancel there whenever you like, no phone call and no retention maze.
More detail on the full FAQ.
Put the spreadsheet down.
14 days of every calculator, every schematic editor and the AI assistant. No credit card, nothing charged when it ends.