Engineering Calculators
Free calculators for the numbers that decide whether a part is manufacturable. No sign-up, no email, and the sheet metal limits come from the same rule set our automated DFM review runs.
Bend Allowance Calculator
Calculate bend allowance, bend deduction and flat length from thickness, inside radius, angle and k-factor. Checks the radius against forming limits.
Open the calculatorTap Drill Size Calculator
Find the tap drill for any metric or unified thread at a target percent of thread, with the nearest stocked drill and minimum thread depth by material.
Open the calculatorSurface Finish Converter
Convert Ra between micrometers and microinches, and cross-reference RMS, Rz, VDI 3400 and SPI mold grades, with the processes that reach each value.
Open the calculatorISO Fits and Tolerances Calculator
Compute ISO 286 hole and shaft limits at any nominal size, with max and min clearance and whether the fit is clearance, transition or interference.
Open the calculatorWritten guides on the same subjects
Each calculator answers one number. The design guides work through the reasoning behind it, including what the number costs you when it is wrong.
Browse the engineering guides