Engineering Tools

Field-ready calculators for engineers: HVAC loads, flows, pressures, materials and more—reliable results, instant outputs.

42 tools available

Calculators 42

HDD & CDD Calculator

Calculate heating degree days (HDD) and cooling degree days (CDD) from temperature data. Estimate annual energy consumption for buildings.

Calculators › HVAC Calculators
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.

Calculators › HVAC Calculators
Ventilation Calculator

Calculate required ventilation airflow based on room area, occupancy, and ASHRAE standards. Free tool for HVAC engineers and designers.

Calculators › HVAC Calculators
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.

Calculators › HVAC Calculators
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.

Calculators › Wire Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
Dew Point & RH Calculator

Free online calculator to convert between temperature, relative humidity, and dew point. Calculate psychrometric properties for HVAC applications.

Calculators › HVAC Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › HVAC Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Wire Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
Three-phase voltage drop

Calculate three-phase voltage drop for Delta and Wye configurations with power factor. Professional electrical engineering calculator for industrial systems.

Calculators › Wire Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Wire Calculators
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.

Calculators › Engineering Calculators
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.

Calculators › Wire Calculators
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.

Calculators › Wire Calculators
Wire resistance calculator

Calculate electrical wire resistance with temperature compensation. Supports copper, aluminum, and other materials. Free online wire resistance calculator.

Calculators › Wire Calculators