📐 Engineering Calculators
Free online tools for structural, mechanical, electrical, hydraulic, concrete, and construction engineering.
Engineering Categories
Structural
Analyze beams, columns, trusses and structural members with precision engineering calculators. Calculate deflection, buckling loads, moment of inertia, and more.
15 calculators 🧱Concrete
Design concrete structures with calculators for mix proportioning, volume estimation, rebar spacing, strength calculations, and slab thickness requirements.
15 calculators ⚙️Mechanical
Solve mechanical engineering problems including gear ratios, torque calculations, belt drive systems, spring constants, and thermal expansion analysis.
15 calculators 💧Hydraulics
Calculate pipe flow rates, open channel flow using Manning's equation, pressure head with Bernoulli's equation, rainfall-runoff, and head loss in piping systems.
15 calculators 🚜Construction
Estimate cut and fill volumes, earthwork quantities, soil compaction requirements, slope stability factors of safety, and retaining wall design parameters.
15 calculators ⚡Electrical
Calculate voltage, current and resistance with Ohm's law, power factor correction, voltage drop in conductors, wire sizing per NEC, and transformer ratios.
15 calculatorsFeatured Calculators
Beam Deflection Calculator
The Beam Deflection Calculator determines the maximum deflection of a simply supported beam carrying a concentrated point load at midspan, using Euler-Bernoulli beam theory, and checks the result against the L/360 serviceability limit.
Bolt Shear Capacity Calculator
The Bolt Shear Capacity Calculator determines the nominal shear strength of a single bolt in one shear plane, using the gross bolt area and the nominal shear stress from AISC 360 Table J3.2.
Concrete Anchor Capacity Calculator
The Concrete Anchor Capacity Calculator compares concrete breakout against steel capacity for an anchor in tension, including the edge distance effect.
Concrete Block Wall Calculator
The Concrete Block Wall Calculator determines block quantities, face-shell mortar and grout volume for reinforced or unreinforced blockwork.
Air Receiver Sizing Calculator
The Air Receiver Sizing Calculator determines stored free air, compressor cycling rate and duty cycle from receiver volume, pressure band, delivery and demand.
Bearing Life Calculator
The Bearing Life Calculator determines the ISO 281 basic rating life L10 from the dynamic load rating, equivalent load and rotational speed.
Bernoulli Equation Calculator
The Bernoulli Equation Calculator applies the energy equation between two points in a flow system, solving for the downstream pressure from the upstream conditions, velocity change, elevation change and head loss.
Catchment Runoff Calculator
The Catchment Runoff Calculator computes storm runoff depth and volume using the SCS Curve Number method, from rainfall depth, curve number and catchment area.
Asphalt Tonnage Calculator
The Asphalt Tonnage Calculator converts area and compacted thickness into tonnage, with the loose laying depth and estimated cost.
Brick Wall Calculator
The Brick Wall Calculator determines brick quantity and mortar volume from wall area, brick dimensions and joint thickness.
AWG Wire Size Converter
The AWG Wire Size Converter turns an American Wire Gauge number into conductor diameter, cross-sectional area, resistance per kilometre and voltage drop.
Battery Bank Sizing Calculator
The Battery Bank Sizing Calculator determines the storage capacity needed for a given daily load and autonomy period, allowing for depth of discharge and efficiency.
All Calculators (A–Z)
About EngiCalcul
EngiCalcul provides free, accurate engineering calculators for professionals, students, and enthusiasts. Our tools cover six major engineering disciplines: structural engineering, concrete design, mechanical engineering, hydraulics and hydrology, construction and earthworks, and electrical engineering.
Every calculator includes the underlying formula, variable definitions, step-by-step worked examples, engineering references, and frequently asked questions. All tools support both Metric (SI) and Imperial unit systems with real-time calculations and input validation.
Disclaimer: These calculators are intended for educational purposes and preliminary design estimates. Always verify results with a licensed professional engineer for critical design decisions.