Engineering Tools
Field-ready calculators for engineers: HVAC loads, flows, pressures, materials and more—reliable results, instant outputs.
Calculators 45
Engineering Calculators 32
Area calculator
Free online area calculator for rectangle, triangle, circle, trapezoid, ellipse, sector, and parallelogram. Calculate surface area with step-by-step formulas for geometry and construction.
Asphalt calculator
Free online asphalt calculator to estimate the amount of asphalt needed for driveways, roads, and parking lots. Calculate cubic yards, tons, and cost based on area and thickness.
BTU calculator
Free online BTU calculator for air conditioning and heating. Calculate BTU requirements based on room size, insulation, climate, and occupancy. Determine the right AC or heater capacity in BTU, tons, and kW.
Beam load calculator
Free online beam load calculator for structural engineering. Calculate maximum deflection, bending moment, and shear force for simply supported and cantilever beams with point loads and distributed loads. Essential tool for engineers and designers.
Brick calculator
Free online brick calculator for construction. Calculate number of bricks and mortar needed for walls. Supports standard, modular, queen, and king brick sizes with mortar joints and waste percentage.
CFM calculator
Free online CFM (Cubic Feet per Minute) calculator for HVAC, ventilation, and air flow calculations. Calculate required air flow based on room size, air changes, or cooling/heating load.
Concrete calculator
Free online concrete calculator for slabs, columns, footings, and tubes. Calculate concrete volume in cubic meters, cubic yards, and cubic feet. Estimate weight and material needed for construction projects.
Drywall calculator
Free online drywall calculator to estimate the number of drywall sheets, screws, joint compound, and tape needed for walls and ceilings. Calculate based on room dimensions with waste factor included.
Duct pressure calculator
Free online duct pressure calculator for HVAC systems. Calculate static pressure drop, friction loss, and velocity pressure in air ducts based on CFM, duct size, and length.
Duct size calculator
Free online duct size calculator for HVAC systems. Calculate rectangular or round duct dimensions based on CFM and velocity. Essential for air conditioning and ventilation design.
Flow rate calculator
Free online flow rate calculator to calculate volumetric flow rate, velocity, and pipe area. Convert between m³/h, L/min, GPM, and CFM. Essential for plumbing, HVAC, and fluid systems.
Gear ratio calculator
Free online gear ratio calculator to calculate speed ratios, RPM, torque multiplication, and gear teeth for mechanical design. Essential tool for automotive, robotics, and mechanical engineering.
Grade calculator
Free online grade calculator for land grading, site work, and elevation changes. Calculate grade percentage, slope, and elevation differences for drainage, roads, and landscaping projects.
Gravel calculator
Free online gravel calculator to estimate the amount of gravel, stone, or aggregate needed for driveways, paths, and landscaping. Calculate cubic yards, tons, and bags based on area and depth.
Insulation calculator
Free online insulation calculator to estimate the amount of insulation material needed for walls, attics, and ceilings. Calculate based on area, R-value, and insulation type including fiberglass, foam, and cellulose.
Material weight calculator
Free online material weight calculator for steel, aluminum, copper, and other metals. Calculate weight based on dimensions and density for plates, bars, tubes, and sheets.
Mulch calculator
Free online mulch calculator for landscaping projects. Calculate mulch volume needed for rectangular, circular, and triangular garden beds. Determine bags needed and coverage area in cubic yards, cubic feet, and cubic meters.
Paint calculator
Free online paint calculator to estimate the amount of paint needed for walls, rooms, and surfaces. Calculate paint quantity in liters and gallons based on room dimensions, coats, and coverage rate. Perfect for home painting projects.
Pipe volume calculator
Free online pipe volume calculator to calculate internal volume, capacity, and water weight for circular pipes. Calculate based on diameter and length for plumbing and engineering.
Pressure drop calculator
Free online pressure drop calculator for pipes and ducts. Calculate pressure loss for water, air, and gas flow using Darcy-Weisbach equation. Essential for HVAC, plumbing, and fluid mechanics.
Psychrometric calculator
Free online psychrometric calculator for HVAC calculations. Calculate relative humidity, dew point, wet bulb temperature, enthalpy, and other air properties based on dry bulb temperature and humidity.
Pulley & belt calculator
Free online pulley and belt calculator to calculate speed ratio, RPM, belt length, and pulley sizes. Essential tool for mechanical engineering, conveyor systems, and motor drive calculations.
Rebar calculator
Free online rebar calculator to estimate the number of reinforcement bars needed for concrete slabs, beams, and columns. Calculate rebar quantity, length, and weight based on dimensions and spacing.
Refrigerant charge calculator
Free online refrigerant charge calculator for HVAC and air conditioning systems. Estimate the correct amount of refrigerant needed based on system capacity, line set length, and pipe diameter. Supports R-410A, R-32, R-22, and more.
Refrigeration capacity calculator
Free online refrigeration capacity calculator for cold storage, freezers, and cooling systems. Calculate required cooling capacity in BTU/hr, tons, and kW based on heat load and temperature.
Roofing calculator
Free online roofing calculator to estimate roof area and materials needed. Calculate by roof pitch or angle, including eaves overhang. Get estimates for shingles, felt, and roofing materials.
Slope calculator
Free online slope calculator to calculate slope percentage, angle, rise over run for roofs, ramps, stairs, drainage, and roads. Convert between degrees, percent, and ratio formats.
Square footage calculator
Free online square footage calculator for rectangles, circles, triangles, trapezoids, parallelograms, rings, and sectors. Calculate area in square meters, square feet, square inches, and square centimeters.
Stair calculator
Free online stair calculator for construction and renovation. Calculate number of steps, rise, run, total length, and angle. Verify against building codes for safe and comfortable staircase design.
Tile calculator
Free online tile calculator to estimate the number of tiles needed for floor and wall projects. Calculate by area or room dimensions, includes grout spacing and waste percentage. Get accurate tile estimates.
Torque calculator
Free online torque calculator to calculate torque from force and distance. Convert between N·m, lb·ft, and lb·in. Essential tool for mechanical engineering, automotive, and physics calculations.
Volume calculator
Free online volume calculator for sphere, cone, cube, cylinder, rectangular tank, capsule, pyramid, ellipsoid, and more. Calculate volume with step-by-step formulas for geometry and engineering.
HVAC Calculators 6
HDD & CDD Calculator
Calculate heating degree days (HDD) and cooling degree days (CDD) from temperature data. Estimate annual energy consumption for buildings.
U-value & R-value Converter
Convert between U-value and R-value for building insulation. Calculate total thermal resistance for multi-layer assemblies. Free HVAC tool.
Ventilation Calculator
Calculate required ventilation airflow based on room area, occupancy, and ASHRAE standards. Free tool for HVAC engineers and designers.
ACH Calculator
Free ACH calculator to determine air changes per hour based on room volume and airflow rate. Essential for HVAC design, ventilation, and indoor air quality.
Dew Point & RH Calculator
Free online calculator to convert between temperature, relative humidity, and dew point. Calculate psychrometric properties for HVAC applications.
HVAC load calculator
Free online HVAC load calculator to estimate heating and cooling requirements for buildings. Calculate sensible and latent heat loads for proper HVAC system sizing.
Wire Calculators 7
AWG to mm converter
Convert AWG wire gauge to millimeters instantly. Free online AWG to mm converter with diameter and cross-sectional area calculations. Professional electrical engineering tool.
SWG to mm converter
Convert SWG (Standard Wire Gauge) to millimeters instantly. Free online SWG to mm converter with diameter and cross-sectional area calculations. British wire gauge converter.
Three-phase voltage drop
Calculate three-phase voltage drop for Delta and Wye configurations with power factor. Professional electrical engineering calculator for industrial systems.
Voltage drop calculator
Calculate voltage drop in electrical circuits. Free online voltage drop calculator for DC and AC circuits with multiple wire types and materials.
Wire ampacity estimator
Estimate wire ampacity with derating factors for temperature and conduit fill. Reference tool based on NEC guidelines. Always consult local electrical codes.
Wire gauge calculator
Free online wire gauge calculator for AWG wires. Calculate diameter, cross-sectional area, and electrical resistance. Support for copper, aluminum, and other wire materials.
Wire resistance calculator
Calculate electrical wire resistance with temperature compensation. Supports copper, aluminum, and other materials. Free online wire resistance calculator.
Conversion 4
Electric Charge Conversion 1
All Charge Units
Convert electric charge units instantly. Coulombs, milliCoulombs, microCoulombs, nanoCoulombs, picoCoulombs, Amp-hours, milliamp-hours.
Flow Rate Conversion 1
All Flow Rate Units
Convert all flow rate units instantly. Liters per second, minute, hour, cubic meters, gallons per minute, cubic feet in one tool.
Power Conversion 1
All Power Units
Convert all power units instantly. Watts, kilowatts, megawatts, horsepower, BTU per hour, foot-pounds per second in one tool.
Voltage Conversion 1
All Voltage Units
Convert all voltage units instantly. Volts, millivolts, microvolts, kilovolts, megavolts in one tool.
