Sheet Metal & Fabrication Calculators
Develop printable patterns for cones, reducers, transitions, elbows, branches, hoppers and screw flights. Bend and pipe-layout tools show the true lengths, angles and assumptions needed to mark material before cutting.
Choose a fabrication workflow
Start with the finished shape you need. Each calculator explains its measurement convention, development method, printable output, and the process allowances that remain yours to apply.
Reducers and transitions
Develop changes between round and rectangular sections using the method that matches the geometry.
Cones and hoppers
Create printable blanks for centered circular frustums and rectangular hopper faces.
Pipe layout
Mark orientation and calculate straight cut length from the references on the drawing and fittings in hand.
Bend Allowance Calculator
Calculate sheet-metal bend allowance, deduction and setback, or find K-factor from a measured test bend.
Cone Flat Pattern
Generate the flat (developed) pattern for a truncated cone from its top/bottom diameters and height.
Square to Round
Develop the flat-pattern panels for a square or rectangle-to-round duct or pipe transition by triangulation.
Reducer Layout
Develop the flat-pattern template for a pipe reducer, concentric or eccentric, including the fully flush case.
Flat-Oval to Round
Develop the flat-pattern template for a centered transition between flat-oval and round duct.
Box & Pan Pattern
Develop the one-piece flat-pattern blank for a four-flange sheet metal box, pan or tray, with corner relief.
Segmented Elbow
Lay out a gored/lobster-back elbow's miter angles and per-piece flat pattern from diameter, bend radius, angle and piece count.
Duct Rolled Offset
Calculate rolled-offset travel, advance and roll angle, with a printable mitered-elbow cut template.
Chain & Sprocket Calculator
Calculate roller-chain pitch length, adjusted center distance and sprocket speed ratio from tooth counts.
Metal Weight Calculator
Calculate the weight of plate, round bar, square bar, tube or angle stock from cross-section, density and cut list.
Surface Speed Calculator
Solve spindle RPM and feed rate from target cutting speed for turning or milling operations.
Tap Drill Calculator
Calculate the theoretical tap drill diameter for a metric or unified thread at a target percent of thread engagement.
V-Belt Length Calculator
Calculate V-belt pitch length from pulley diameters and center distance, or solve center distance from a selected belt length.
Screw Flight Pattern
Develop an annular-sector workshop blank for one screw-flight turn from outside diameter, shaft diameter and pitch.
Pipe Fitting Takeoff
Deduct user-supplied fitting center-to-end dimensions from field measurements to find a pipe cut length.
Offset Branch Template
Generate a full-wrap branch-pipe intersection profile with a signed axis offset and branch angle.
Pipe Offset Clocking
Convert vertical and lateral offsets into near/far-end clock positions and circumference marks from an established datum.
Offset Multiplier
Calculate travel and run for a same-plane pipe offset from the offset distance and fitting angle, with the standard multiplier chart.
Truncated Pyramid Pattern
Develop the four true-size trapezoid panels for a centered rectangular truncated pyramid.
Hopper Flat Pattern
Develop four printable trapezoid panels for a centered rectangular hopper inlet and outlet.
Oblique Cone Pattern
Triangulate an offset-apex circular cone into a printable developed blank with true generator lengths.
Duct Seam Allowance
Estimate rectangular or round duct blank girth with a shop-specified seam allowance, in millimetres or inches, plus strips per stock width.