Utilities
Unit Converter
Convert length, mass, pressure, temperature, volume, area, speed, force, energy, and power units.
Open calculator →Mechanical engineering calculators
Tools that actually work
84 calculators for pneumatics, GD&T, sheet metal, CNC, and heat transfer. Open any tool, get your answer, and move on.
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Featured calculators
Our most searched tools for beam design, gears, bolts, hydraulics, and everyday engineering math.
Utilities
Scientific Calculator
Full working calculator with sin, cos, tan, log, powers, and a running history.
Open calculator →Mechanical
Gear Ratio Calculator
Gear ratio, output RPM, and output torque for a two-gear drive with optional efficiency.
Open calculator →Mechanical
Bolt Torque Calculator
Tightening torque from nominal diameter, lubrication, and target clamp load using T = K x F x d.
Open calculator →Mechanical
Beam Stress and Deflection Calculator
Bending moment, stress, and deflection for a simply supported beam with a central point load.
Open calculator →Mechanical
Spring Calculator
Compression spring rate, deflection, shear stress, and solid height in metric units.
Open calculator →Manufacturing
Metal Weight and Price Calculator
Stock weight and material cost from shape, dimensions, density, and quantity.
Open calculator →Sheet Metal
Sheet Metal Bend Allowance Calculator
Flat pattern length from bend angle, inside radius, K-factor, and leg lengths.
Open calculator →Fluid Power
Hydraulic Cylinder Force Calculator
Extend and retract forces from hydraulic pressure and cylinder geometry.
Open calculator →Machining & CNC
Cutting Speed and RPM Calculator
Spindle RPM and table feed from cutting speed, tool diameter, and chip load.
Open calculator →Machining & CNC
CNC Feeds and Speeds Calculator
Spindle speed, feed rate, MRR, and cutting power for milling or turning.
Open calculator →Machining & CNC
Machining Time Estimator
Turning, milling, and drilling cycle time from length, feed, and RPM.
Open calculator →Fluid Power
Pneumatic Cylinder Force Calculator
Extend and retract forces from pressure, bore, and rod diameter in SI or Imperial units.
Open calculator →Machining & CNC
Lathe RPM and Cutting Speed Calculator
Spindle RPM and achieved peripheral speed from work diameter and cutting speed.
Open calculator →Mechanical
Motor Gearbox Selector Calculator
Motor power from torque, output speed, and service factor.
Open calculator →Mechanical
Mohr's Circle Calculator
Principal stresses, maximum shear stress, and principal angle from plane stress.
Open calculator →Mechanical
Bearing Life (L10) Calculator
L10 life, adjusted life, and reliability-adjusted hours from ISO-style factors.
Open calculator →Mechanical
Press Fit and Shrink Fit Calculator
Contact pressure, hoop stress, torque capacity, and axial force for interference fits.
Open calculator →Mechanical
Conveyor Power and Tension Calculator
Effective tension, drive power, throughput, and belt side tensions for conveyors.
Open calculator →Fixture & Tooling
Tolerance Stack-Up Calculator
Worst-case and RSS gap analysis for a four-component dimensional loop.
Open calculator →GD&T & Metrology
GD&T True Position Calculator
True position deviation and pass or fail for 2D or 3D feature location.
Open calculator →GD&T & Metrology
ISO 286 Tolerance Calculator
Hole and shaft limits with fit classification from ISO tolerance classes.
Open calculator →GD&T & Metrology
Surface Roughness Converter
Convert Ra, Rz, Rq, Rt, micro-inch, and ISO N-grade roughness values.
Open calculator →Thermal & Fluids
Reynolds Number Calculator
Reynolds number and flow regime for pipe, flat plate, or sphere geometry.
Open calculator →Thermal & Fluids
Rankine Cycle Efficiency Calculator
Thermal efficiency, work terms, and back-work ratio for a steam power cycle.
Open calculator →Thermal & Fluids
Heat Exchanger LMTD Calculator
LMTD, heat duty, required area, and UA for counterflow or parallel flow.
Open calculator →Thermal & Fluids
Heat Transfer Calculator (Conduction)
Conduction heat rate, thermal resistance, and heat flux through a plane wall.
Open calculator →EV & Renewable
EV Battery Pack Sizing Calculator
Pack energy, cell count, configuration, and thermal load from range and cell specs.
Open calculator →Mechanical
Material Property Database
Yield strength, tensile strength, density, and more for common engineering metals.
Open calculator →Browse by category
Mechanical Calculators
Beams, bolts, springs, gears, bearings, and core ME calculations.
Fluid Power Calculators
Pneumatic and hydraulic cylinder forces and system sizing.
Manufacturing Calculators
Welding, stamping, punch and die tooling, 3D printing, material weight, and production automation.
Machining & CNC Calculators
Cutting speed, feeds, RPM, cycle time, and tap drill charts.
Fixture & Tooling Calculators
Clamping, locating pins, tolerance stack-up, and gauge R&R.
GD&T & Metrology Calculators
True position, fits, ISO tolerances, and surface roughness.
Sheet Metal Calculators
Bend allowance, K-factor, flat pattern length, and minimum bend radius.
Thermal & Fluids Calculators
Heat transfer, pipe flow, Reynolds number, and thermodynamic cycles.
EV & Renewable Calculators
Battery sizing, solar panel tilt, wind turbine performance, and EV drivetrain estimates.
Utilities Calculators
Scientific calculator, unit converter, and general engineering reference tools.
Who uses TaskJunction
Students, designers, toolmakers, and maintenance staff all reach for the same quick checks during the day.
Students
Verify beam deflection, gear ratios, and Reynolds number homework before you submit the sheet.
Design engineers
Screen belt drives, bolt torque, and tolerance stacks during layout reviews and BOM checks.
Manufacturing & tooling
Quote punch tonnage, weld heat input, and machining time without leaving the browser tab.
Maintenance & reliability
Check cylinder force, wire rope capacity, and bearing life against nameplate data on the floor.
What engineers are saying
Feedback from students and working engineers who use the tools for homework, reviews, and floor checks.
“I used the beam deflection calculator the night before my machine design viva. Clean page, correct formula, no sign-up wall. Exactly what I needed.”
Arjun K.
Final-year mechanical engineering student
“We run punch tonnage and bend allowance checks on TaskJunction during NPI reviews. Faster than digging through old spreadsheets on the shared drive.”
Priya M.
Tooling design engineer, sheet metal
“Maintenance asked for extend force on a replacement air cylinder before the PO went out. I had the number in under a minute on my phone next to the line.”
Marcus T.
Reliability engineer, discrete manufacturing
“The GD&T true position and ISO tolerance tools save me from flipping PDF standards when a supplier drawing lands with mixed callouts.”
Elena R.
Quality engineer, automotive supplier
Built by a mechanical engineer
Need a calculator that is not here yet?
TaskJunction is maintained by Vaibhav Dhokpande, a design engineer who builds tools from real shop and office problems. Browse 84 free calculators now, or suggest one for the roadmap.