MechanixCalc is a web-based suite of 50 standards-based mechanical-engineering calculators — the bridge between a free single-answer calculator and a $10,000 desktop seat. Every tool runs the actual governing standard — ISO 6336 (gears), ISO 281 (bearings), VDI 2230 (bolted joints), DIN 743 (shafts), ASME VIII (pressure vessels), EN 1993 (structural steel & welds), ASME B31.3 (piping) and more — shows the formula and a worked example, and exports a branded PDF report a reviewer can actually follow. It's built for the people who size, check and quote mechanical designs every day — machine builders, CNC shops, design engineers and consultants — who need a defensible number now, not a simplified estimate they can't put in a design file. What's inside: • 50 calculators across 9 engineering domains • 40+ implemented standards (ISO · ASME · EN · DIN · VDI · AGMA) • 3 schematic editors — fluid power, P&ID, electrical • Branded, shareable PDF reports on every calculation • A REST API and a Fusion 360 design Copilot Conservative, standards-grade results are the product: no calculator ever claims a standard it doesn't implement. Try any tool free for 30 minutes — no signup. Then a 14-day trial, no credit card. Paid plans from $19/month. → https://www.mechanixcalc.com