Engineering Calculators
Free online calculators and tools for a range of engineering topics
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Electrical Engineering Calculators
Discover our collection of electrical engineering calculators designed to help engineers, students, and hobbyists quickly solve circuit problems. Calculate voltage, current, resistance, power, and frequency for both AC and DC circuits with precision and ease.
AC Power Calculator
Compute real, reactive, and apparent power in single-phase or three-phase AC circuits. Ideal for load analysis, electrical design, and energy calculations.
Cutoff Frequency Calculator
Calculate cutoff frequencies for RC and RL circuits to design low-pass, high-pass, and band-pass filters efficiently. Perfect for electronics design and signal processing.
Inductor Calculator
Calculate inductance for air-core or magnetic-core coils based on turns, coil length, cross-sectional area, and core permeability. Ideal for designing coils and inductors.
Ohm's Law Calculator
Use the Ohm's Law Calculator to determine voltage, current, or resistance in DC and AC circuits. Ideal for electrical engineering students and professionals analyzing simple and complex circuits.
Power Factor Calculator
Optimize AC circuit efficiency by calculating power factor. Minimize reactive power and improve energy efficiency in electrical systems.
RC / RL / RLC Circuit Calculator
Analyze series and parallel RC, RL, and RLC circuits to calculate impedance, phase angle, and resonance frequency. Useful for electrical engineers and circuit designers.
Resistor Color Code Calculator
Quickly identify resistor values from color bands or determine color codes for resistors. Essential for electronics projects and circuit assembly.
Resonant Frequency Calculator
Determine the resonant frequency of LC circuits accurately. Essential for designing oscillators, filters, and RF circuits in electrical engineering.
Series & Parallel Resistor / Capacitor Calculator
Compute equivalent resistance or capacitance for series and parallel configurations. Streamline the design of complex electronic circuits and networks.
Voltage Divider Calculator
Calculate output voltages in resistor voltage divider circuits accurately. Perfect for electronics design, prototyping, and learning fundamental circuit principles.
Voltage Drop Calculator
Calculate voltage drop across electrical conductors based on wire size, length, material, and current.
Wire Size Calculator
Determine the correct wire gauge based on current load, conductor material, cable length, and allowable voltage drop.
Fluid Dynamics Calculators
Explore advanced fluid dynamics calculators to analyze pipe flow, pressure drop, velocity, and energy losses in engineering systems.
Bernoulli Equation Calculator
Analyze fluid energy, pressure, and velocity changes in pipelines and channels with Bernoulli's principle for engineering applications.
Buoyancy Force Calculator
Estimate buoyant force on submerged objects for fluid mechanics, ship design, and marine engineering applications.
Darcy-Weisbach Calculator
Calculate pipe friction losses, flow rate, and velocity using the Darcy-Weisbach equation for accurate hydraulic system analysis.
Drag Force Calculator
Calculate drag force on objects in fluids to optimize design in engineering, aerodynamics, and fluid mechanics projects.
Hazen-Williams Pipe Flow Calculator
Estimate water flow, pipe velocity, and pressure drops in pipes with the Hazen-Williams formula for efficient pipeline design.
Hydraulic Radius Calculator
Determine hydraulic radius and flow efficiency in channels and pipes to improve water transport and system design.
Manning's Equation Calculator
Estimate open channel flow, velocity, and hydraulic radius using Manning's equation for irrigation, drainage, and water management systems.
Orifice Flow Calculator
Calculate flow rate through an orifice using discharge coefficient, head pressure, and orifice area. Essential for tank drainage, hydraulics, and fluid flow measurement.
Pipe Sizing Calculator
Determine optimal pipe diameter, flow rate, and velocity for residential, commercial, and industrial piping systems.
Pump Head Calculator
Compute pump head, flow rate, and system pressure to select the right pump for your hydraulic applications.
Reynolds Number Calculator
Calculate Reynolds number to predict laminar or turbulent flow and optimize fluid transport in pipes and channels.
Stack Effect Calculator
Estimate airflow, pressure difference, and chimney draft created by temperature-induced buoyancy in buildings, ventilation systems, and industrial exhaust stacks.
Geometric Calculators
Use a range of geometric calculators to quickly compute dimensions, areas, perimeters, volumes, and other essential measurements for engineering, construction, and design projects.
Circumference Calculator
Find the circumference of circles, wheels, or pipes by entering radius or diameter with our easy-to-use circumference calculator.
Cross-Sectional Area Calculator
Calculate the cross-sectional area of geometric shapes such as circles, rectangles, and polygons for engineering and design purposes.
Perimeter Calculator
Determine the perimeter of squares, rectangles, triangles, and polygons accurately to support construction and design planning.
Second Moment of Area Calculator
Compute the second moment of area (area moment of inertia) for beams and structural elements to analyze bending and stability.
Surface Area Calculator
Quickly calculate the surface area of 3D shapes like spheres, cylinders, and prisms for manufacturing, packaging, or engineering tasks.
Volume Calculator
Find the volume of cubes, cylinders, spheres, and other solids for material estimation, storage planning, or engineering projects.
Material Properties Calculators
Access free online material property calculators to evaluate key engineering parameters such as bulk modulus, density, ductility, tensile strength, and thermal properties for accurate design and analysis.
Bulk Modulus Calculator
Calculate the bulk modulus of elasticity to determine a material’s resistance to uniform compression, essential for fluid mechanics and structural engineering applications.
Density Calculator
Compute material density to analyze mass-to-volume relationships, vital for fluid flow, buoyancy, and structural performance calculations.
Ductility Calculator
Evaluate ductility to measure how much a material can stretch or deform before fracture, critical in assessing toughness and forming processes.
Elastic Modulus Calculator
Determine Young’s modulus (elastic modulus) to understand a material’s stiffness and ability to deform under stress, widely used in mechanical and civil engineering design.
Fracture Toughness Calculator
Calculate fracture toughness to predict material resistance against crack propagation, crucial in aerospace, automotive, and structural applications.
Hardness (Brinell) Calculator
Find Brinell hardness values to assess a material’s resistance to indentation and wear, commonly used for metals and alloys in engineering analysis.
Poisson's Ratio Calculator
Calculate Poisson’s ratio to measure the ratio of lateral strain to axial strain, an important parameter in elasticity and structural mechanics.
Shear Modulus Calculator
Determine shear modulus to evaluate a material’s response to shear stress, vital for analyzing rigidity in shafts, beams, and mechanical components.
Thermal Diffusivity Calculator
Evaluate thermal diffusivity to analyze how quickly heat spreads through a material, important in thermal engineering and heat transfer studies.
Thermal Expansion Calculator
Calculate thermal expansion coefficients to determine how materials change in size with temperature, crucial for designing systems exposed to heat variations.
Ultimate Tensile Strength Calculator
Compute ultimate tensile strength (UTS) to measure the maximum stress a material can withstand before breaking, critical in mechanical design and safety analysis.
Yield Strength Calculator
Calculate yield strength to identify the stress point at which a material begins to plastically deform, essential in load-bearing structural analysis.
Mathematical Calculators
Access free online mathematical tools for performing matrix operations, percentage computations, ratio evaluations and more used for engineering, science, and data analysis.
Average Calculator
Quickly calculate the arithmetic mean of multiple numbers. Ideal for students, engineers and anyone needing fast, accurate average calculations.
Decimal to Fraction Calculator
Convert any decimal into a simplified fraction instantly. Ideal for math students, engineers, and precise measurement conversions.
Fraction Calculator
Add, subtract, multiply, and divide fractions with automatic simplification and decimal results.
Fraction Conversion Calculator
Convert between mixed numbers and improper fractions instantly, with automatic simplification for accurate mathematical results.
Fraction to Decimal Calculator
Convert any fraction into a decimal value quickly and accurately, with support for improper and mixed fractions.
Matrix Calculator
Perform matrix operations, transformations and engineering computations with ease.
Median Calculator
Find the middle value of a set of numbers instantly. Perfect for students, data analysts, and anyone analyzing datasets with even or odd counts of numbers.
Mixed Numbers Calculator
Convert, simplify, and perform operations with mixed numbers and improper fractions effortlessly.
Mode Calculator
Determine the most frequently occurring number(s) in a dataset quickly. Useful for statistics, business analysis, and identifying common values in data.
Percentage Calculator
Compute percentage values, percent change, and comparisons instantly. Useful for engineering tolerances, efficiency analysis, scaling, and general math applications.
Ratio Calculator
Calculate simplified ratios, find equivalent ratios, or compare quantities for engineering design, scaling and system performance analysis.
Standard Deviation Calculator
Calculate population and sample standard deviation, variance, and mean to analyze data variability for statistics, engineering, and scientific applications.
Mechanical Calculators
Access free online mechanical calculators to evaluate key parameters such as gear ratios, torque, and mechanical power for accurate system design and analysis.
Belt Length Calculator
Calculate the required belt length for two-pulley systems using pulley diameters and center distance. Ideal for machinery design, maintenance, and belt-drive optimization.
Gear Ratio Calculator
Quickly determine output speed and torque in gear trains by entering input speed, input torque, and gear ratio. Ideal for mechanical engineers and automotive designers.
Torque Calculator
Calculate torque for rotating shafts and mechanical systems. Useful for designing transmissions, motors, and gear assemblies with precise torque requirements.
Mechanical Power Calculator
Compute mechanical power based on torque and rotational speed to optimize machinery performance and ensure efficient energy usage in mechanical systems.
Propeller Thrust Calculator
Estimate thrust generated by a propeller using diameter, velocity and air density.
Pulley Ratio Calculator
Determine pulley speed ratios, output RPM, and torque changes based on pulley diameters.
Spring Constant Calculator
Compute spring constant, force, or displacement using Hooke’s Law with full metric and imperial unit support.
Taylor's Tool Life Calculator
Calculate tool life using Taylor’s equation to optimize cutting speeds, improve machining efficiency, and reduce tool wear in manufacturing processes.
Miscellaneous Calculators
Access free online calculators for various practical applications, helping engineers to make accurate calculations for performance quickly and efficiency.
Age Calculator
Calculate exact age in years, months, days, and even hours. Useful for personal records, planning, and time-related calculations.
Air Changes Per Hour (ACPH) Calculator
Determine the number of times air is replaced in a room or building per hour. Useful for HVAC design, ventilation planning, and maintaining healthy indoor air quality.
Fuel Cost Calculator
Estimate fuel expenses for vehicles or machinery based on fuel consumption, distance, and price per unit. Ideal for budgeting and optimizing fuel usage in transportation and operations.
Hours Calculator
Compute total hours between two times or sum multiple time entries. Ideal for schedules, payroll, shift planning, and project tracking.
GPA Calculator
Determine grade point average using course credits and grades. Essential for students monitoring academic performance and planning goals.
Roman Numerals Calculator
Convert numbers to and from Roman numerals instantly. Helpful for history, design, clocks, numbering systems, and academic references.
Square Footage Calculator
Measure area in square feet based on length and width. Ideal for real estate, construction planning, room layout, and material estimation.
Test Grade Calculator
Quickly calculate your test or exam grade based on scored points and total possible points. Ideal for students and educators to assess performance instantly.
Time Calculator
Add, subtract, and compute differences between times easily. Useful for scheduling, time management, work logs, and travel planning.
Time Until Calculator
Find the amount of time remaining until a specific date and time. Useful for planning deadlines, events, or countdowns for projects and personal milestones.
Structural Engineering Calculators
Use our free structural engineering calculators to analyze stress, strain, deflection, buckling, axial load, and joint capacity. These tools help engineers quickly verify designs and ensure safety in mechanical and civil structures.
Axial Load Calculator
Compute axial stress, deformation, and load capacity for structural members under direct tension or compression.
Beam Bending Calculator
Calculate beam deflection, bending stress, and moment capacity for simply supported and cantilever beams under various loading conditions.
Bolt Shear & Tension Calculator
Evaluate bolt shear strength, tensile capacity, and combined loading performance in structural connections.
Column Buckling Calculator
Determine Euler’s critical buckling load, slenderness ratio, and safety factor for structural columns under axial compression.
Hertzian Contact Stress Calculator
Calculate contact pressure, contact radius, and subsurface stresses between curved surfaces using Hertzian contact theory for bearings, gears, and rollers.
Hoop Stress Calculator
Calculate hoop stress and radial stress in thin-walled and thick-walled pressure vessels under internal and external pressure.
Mohr's Circle Calculator
Calculate hoop stress and radial stress in thin-walled and thick-walled pressure vessels under internal and external pressure.
Stress Transformation Calculator
Apply general stress transformation equations to compute normal and shear stresses at any rotated angle θ.
Shear Force & Bending Moment Diagram Calculator
Generate shear force and bending moment diagrams to visualize internal forces in beams subjected to distributed and point loads.
Truss Analysis Calculator
Perform truss analysis using the method of joints or method of sections to find axial forces in truss members.
Von Mises Stress Calculator
Calculate Von Mises equivalent stress from biaxial normal and shear stresses to check yielding in ductile materials.
Wear Rate Calculator
Estimate material wear rate using Archard’s equation by inputting load, hardness, and sliding distance to predict surface wear in engineering applications.
Weld Strength Calculator
Estimate the load-carrying capacity of fillet and groove welds based on weld size, length, electrode strength, and safety factor.
Thermodynamics Calculators
Explore essential thermodynamics calculators to analyze gases, heat transfer, entropy, enthalpy, humidity, and energy efficiency. Perfect for engineering, physics, and HVAC applications.
Dew Point Temperature Calculator
Find the dew point at which air becomes saturated and condensation begins.
First Law of Thermodynamics Calculator
Apply energy conservation to calculate work, heat, and internal energy changes.
Entropy Calculator
Determine entropy changes for processes and assess system disorder.
Enthalpy Calculator
Calculate enthalpy changes to analyze heat transfer in constant-pressure systems.
Gibbs Free Energy Calculator
Evaluate ΔG to determine if a reaction is spontaneous using enthalpy, entropy, and temperature.
Heat Transfer Calculator
Evaluate conduction, convection, and radiation heat transfer rates.
Humidity Ratio Calculator
Determine the humidity ratio of moist air from temperature, relative humidity and atmospheric pressure.
Ideal Engine Cycle Efficiency Calculator
Compute theoretical efficiency of Carnot, Otto, Diesel, and Brayton engine cycles.
Ideal Gas Law Calculator
Compute pressure, volume, or temperature of an ideal gas using PV = nRT.
Relative Humidity Calculator
Calculate moisture content of air based on temperature and water vapor pressure.
Specific Heat Calculator
Find the heat required to change the temperature of a substance using its specific heat capacity.
Stagnation Temperature Calculator
Calculate stagnation temperature from flow velocity and specific heat to analyze compressible flows in turbines, compressors, and aerodynamic systems.
About EngLab Engineering Calculators
EngLab offers a comprehensive collection of free online engineering calculators for students, professionals, and hobbyists. These calculators cover electrical, fluid dynamics, geometric, material properties, structural, and thermodynamics topics, allowing you to quickly and accurately solve complex engineering problems.
Why Use EngLab Calculators
- Quick and Accurate: Perform precise calculations for circuits, beams, pipes, heat transfer, gas laws, and more.
- Wide Range of Applications: From electrical engineering and thermodynamics to structural analysis and material science.
- Unit Flexibility: Easily switch between units for energy, mass, length, temperature, pressure, and more.
- Educational & Professional Use: Ideal for students, researchers, engineers, and technicians working on academic or industrial projects.
Calculator Categories
- Electrical Engineering: Ohm’s Law, AC/DC power, voltage dividers, filters, inductors, and resistor color codes.
- Fluid Dynamics: Bernoulli, Darcy-Weisbach, Hazen-Williams, Reynolds number, pipe sizing, pump head, and drag forces.
- Geometric Calculations: Area, perimeter, circumference, volume, surface area, and second moment of area.
- Material Properties: Density, bulk modulus, ductility, tensile strength, Young’s modulus, thermal expansion, and hardness.
- Structural Engineering: Beam bending, axial load, column buckling, truss analysis, stress transformation, and weld strength.
- Thermodynamics: Heat transfer, specific heat, entropy, enthalpy, Gibbs free energy, relative humidity, and dew point temperature.
Using EngLab calculators, engineers and students can save time, improve accuracy, and streamline calculations for homework, lab work, research, or professional engineering tasks. The tools are intuitive, mobile-friendly, and designed for rapid problem-solving across multiple engineering disciplines.
Explore the full suite of calculators to enhance your understanding, optimize designs, and make precise engineering decisions with confidence.