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Engineering & Machining Calculators
Structural, mechanical, civil, fluid, machining and manufacturing calculators. 34 free tools that run in your browser, no sign-up needed.
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Gear Ratio CalculatorGear ratio, output rpm and torque for multi-stage gear trains, plus vehicle speed at rpm.BTU CalculatorEstimate air conditioner BTU, tons and heating BTU for a room from its size and conditions.Pipe Flow Rate CalculatorFlow rate from pipe diameter and velocity (GPM, L/s, m³/h), velocity from flow, or pipe size.Rebar CalculatorRebar for a slab grid: bars each way, total length, weight by bar size and stock bars.Beam Deflection CalculatorMax deflection, moment and shear for simply supported, cantilever or fixed beams.Sheet Metal Bend Allowance CalculatorBend allowance, bend deduction and flat blank length from thickness, radius, angle, K-factor.Bolt Torque CalculatorTightening torque for metric and UNC/UNF bolts from grade, lubrication and target preload.Duct Size CalculatorRound duct diameter and equivalent rectangular duct sizes from CFM and friction or velocity.Room Heat Loss CalculatorRoom heat loss in BTU/h and watts from walls, windows, ceiling, floor and air leakage.Moment of Inertia CalculatorMass moment of inertia of common shapes and area moment of beam sections, incl. I-beams.Pulley Belt and Speed CalculatorDriven RPM, belt length, belt speed and ratio from pulley diameters and center distance.Steel Weight CalculatorWeight of steel plate, bar, pipe, tube and angle in kg and lb from dimensions and material.Tap Drill Size CalculatorTap drill size for metric, UNC and UNF threads at any thread %, with a full drill chart.Pipe Volume CalculatorWater volume in a pipe by NPS/schedule or inner diameter: gallons, liters, weight, fill time.Air Changes per Hour CalculatorCalculate ACH from CFM and room size, CFM for a target ACH, ACH50 or ASHRAE ventilation.Aviation Fuel CalculatorFlight fuel required with taxi, reserves and alternate, in gallons, liters and pounds.Bearing CalculatorInitial and final bearing, compass direction and great-circle distance between two coordinates.Belt Length CalculatorBelt length from two pulley diameters and center distance, or center distance from a belt.Bolt Circle CalculatorX/Y coordinates for every hole on a bolt circle, with a drawing and CSV export.Drone Flight Time CalculatorEstimate drone flight time from battery mAh, voltage, discharge, weight and amp draw.E6B Flight ComputerOnline E6B: wind correction, heading, ground speed, time-speed-distance, fuel and conversions.G-Code ViewerPreview 3D printer and CNC G-code in 2D or 3D with layers, size and estimated time.Hydraulic Cylinder CalculatorPush and pull force, extend and retract speed, cycle time and oil volume from bore, rod and pressure.ISO Fits and Tolerances CalculatorHole and shaft limits, clearance or interference and fit type for ISO 286 fits like H7/g6.Map Distance CalculatorClick points on a map to measure a path in km, miles or nautical miles, with GPX export.Pipe Schedule ChartOD, wall thickness, ID, weight per foot and volume for any NPS and pipe schedule.Pump Power CalculatorHydraulic, shaft and motor power in kW and HP from flow, head, specific gravity and efficiency.Section Modulus CalculatorSection modulus, moment of inertia, centroid and radius of gyration for beams and shapes.Shear and Moment Diagram CalculatorDraw shear force and bending moment diagrams with reactions and max values for any beam.Spur Gear CalculatorPitch, outside and root diameters, center distance and tooth sizes from module or DP.Stress and Strain CalculatorStress, strain and Young's modulus from force, area and length change, with material checks.Tension CalculatorRope tension for a hanging mass on one or two angled ropes, a pulled object or a pulley.Screw Thread CalculatorUNC, UNF and metric thread dimensions: major, pitch and minor diameters, tap drill and limits.Aircraft Weight and Balance CalculatorAircraft weight and balance: total weight, moment and CG, plotted against your CG envelope.
About Engineering & Machining Calculators
Engineering and workshop calculators for gear ratios, beam deflection, pipe flow, rebar, BTU sizing and sheet-metal bending. They are meant for estimates and checks; follow your local codes and a qualified engineer for final designs.
Most used here: Gear Ratio Calculator, BTU Calculator and Pipe Flow Rate Calculator.