Engineering Tools
Practical calculators and references for engineers working through drawings, screenshots, specifications, and review packets.
Transparent PNG builder
Build a feature control frame with a GD&T symbol, tolerance, modifiers, and datum references.
Copy or download a transparent PNG with customizable color, size, and line weight for PDF redlines.
GD&T references
Reference-only GD&T tools for approximating tolerance zones, position with MMC/LMC bonus examples, profile, perpendicularity, and related drawing review concepts.
Start with the plus-minus tolerance approximation converter. It is for reference only and is not exactly correct.
Unit converter
Convert common mechanical engineering units for length, force, mass, stress, temperature, power, and torque.
Includes mm to inches, lbf to N and kgf, GPa to ksi, deg C to deg F, W to BTU/hr, N*m to lbf*in, and more.
Fits and limits
Estimate hole and shaft limits, minimum clearance, maximum clearance, and fit type for ISO-style mechanical fits such as H7/g6.
Reference-only approximation for common fits including H7/g6, H7/h6, H7/f7, H7/k6, and H7/p6.