Engineering Calculators | Civil, Electrical,

⚡ Electrical 🏗️ Civil 🏛️ Structural 🔩 Mechanical 🛢️ Offshore

⚡ Electrical Engineering

Ohm's Law Calculator

Calculate Voltage, Current, Resistance or Power — enter any two values

Electrical

Enter any two values — the other two will be calculated automatically.

⚡ Voltage — V (Volts)

〰️ Current — I (Amperes)

🔁 Resistance — R (Ohms Ω)

💡 Power — P (Watts)

Ohm's Law Formulas:
V = I × R I = V / R R = V / I
P = V × I P = I² × R P = V² / R

Enter any 2 values to calculate the rest

Voltage Divider Calculator

Calculate output voltage across a resistor in a voltage divider circuit

Electrical

Input Voltage Vin (V)

Resistor R1 (Ω)

Resistor R2 (Ω)

Formula: Vout = Vin × R2 / (R1 + R2)
Used to reduce voltage and create reference voltages.

Enter values and click Calculate

Electrical Power Calculator

Calculate power consumption, units used and electricity bill

Electrical

Appliance Wattage (W)

Daily Usage (Hours)

Number of Days

Electricity Rate (₹ per kWh)

Enter appliance details to calculate bill

Resistor Color Code Calculator

Decode 4-band and 5-band resistor color codes

Electrical

Select band colors to read resistor value:

Band 1 (First Digit)

Band 2 (Second Digit)

Band 3 (Multiplier)

Band 4 (Tolerance)

Reading: (Band1 × 10 + Band2) × Multiplier ± Tolerance

Select band colors above

🏗️ Civil Engineering

Concrete Mix Calculator

Calculate cement, sand & aggregate quantities for different grades

Civil

Volume of Concrete (m³)

Grade of Concrete

Wastage Factor (%)

Dry Volume = Wet Volume × 1.54 (accounts for voids)
Results include wastage factor allowance.

Enter details and click Calculate

Steel Weight Calculator

Calculate weight of TMT bars, rods and structural steel sections

Civil

Section Type

Diameter (mm)

Length (m)

Number of Pieces

Formula (Round Bar): W = (D²/162) × L
Where D = diameter in mm, L = length in m
Density of Steel = 7850 kg/m³

Enter dimensions and click Calculate

Full Metal Weight Calculator — 15 Profile Types ↗

Steel sheets, pipes, beams, angles, channels, bars + 8 materials

Pipe Flow Calculator

Calculate flow rate, velocity and pipe sizing using Manning's formula

Civil

Pipe Diameter (mm)

Flow Velocity (m/s)

Pipe Material

Formula: Q = A × V (Flow = Area × Velocity)
A = π × (D/2)²

Enter pipe details and click Calculate

Area & Volume Calculator

Calculate area, perimeter and volume for common shapes

Civil

Shape

Select shape and enter dimensions

🏛️ Structural Engineering

Beam Load Calculator

Calculate reactions, max shear force and bending moment for simply supported beam

Structural

Beam Span L (m)

Load Type

UDL Intensity w (kN/m)

Point Load P (kN)

Simply Supported Beam:
UDL: Ra = Rb = wL/2 | Mmax = wL²/8
Point at mid: Ra = Rb = P/2 | Mmax = PL/4

Enter beam details and click Calculate

Beam Deflection Calculator

Calculate maximum deflection for simply supported and cantilever beams

Structural

Beam Type

Span L (m)

Load (kN or kN/m)

Young's Modulus E (GPa)

Moment of Inertia I (cm⁴)

Allowable Deflection: L/250 for floors, L/500 for sensitive structures
Steel E: 200 GPa Concrete E: ~30 GPa Wood E: ~12 GPa

Enter beam properties and click Calculate

Column Load Capacity Calculator

Estimate safe load capacity of RCC column (IS 456 method)

Structural

Column Width b (mm)

Column Depth d (mm)

Concrete Grade (fck MPa)

Steel Grade (fy MPa)

Steel % (Asc/Ag × 100)

Enter column dimensions and click Calculate

Wind Load Calculator

Calculate basic wind pressure on structures (IS 875 Part 3)

Structural

Basic Wind Speed Vb (m/s)

Risk Factor k1

Terrain Factor k2 (Height 10m)

Force Coefficient Cf

Tributary Area (m²)

Select zone and click Calculate

🔩 Mechanical Engineering

Motor Horsepower Calculator

Calculate required motor HP, torque and power for mechanical loads

Mechanical

Load Torque (N·m)

Speed (RPM)

Efficiency (%)

Safety Factor

Formula: P (kW) = T × N × 2π / 60
HP = P (kW) / 0.746
Include safety factor for actual motor selection.

Enter motor parameters and click Calculate

Torque Calculator

Calculate torque, force and arm length relationships

Mechanical

Enter any two values to find the third:

Torque τ (N·m)

Force F (N)

Arm Length r (m)

Angle θ (degrees, default 90°)

Formula: τ = F × r × sin(θ)

Enter any 2 values to calculate

Engineering Unit Converter

Convert pressure, stress, force, energy and temperature units

All Disciplines

Category

Value

From Unit

To Unit

Select category and units

🛢️ Offshore & Marine Engineering

Jacket Leg Weight Calculator

Estimate steel mass and weight of offshore jacket tubular members

Offshore

Outer Diameter OD (mm)

Wall Thickness WT (mm)

Member Length L (m)

Steel Density ρ (kg/m³, default 7850)

Formula: Mass = ρ × A×L, A = π/4×(OD²−ID²)

Enter tube dimensions to calculate weight

Wave Force (Morison Equation)

Calculate total wave force on a vertical cylinder using Morison's equation

Offshore

Cylinder Diameter D (m)

Wave Height H (m)

Wave Period T (s)

Water Depth d (m)

Drag Coeff Cd (default 0.7)

Inertia Coeff Cm (default 2.0)

Morison: F = Fᵩ(drag) + Fᵢ(inertia) Fᵩ = ½ Cᵩ ρ D u|u|, Fᵢ = Cᵢ ρ πD²/4 × à

Enter wave and structure parameters

Mooring Line Tension (Catenary)

Estimate mooring line tension and scope using catenary equations

Offshore

Chain Weight in Water w (kN/m)

Horizontal Tension H (kN)

Water Depth d (m)

Departure Angle at Fairlead (deg)

Catenary: T = √(H²+V²), V = H×tan(α), a = H/w

Enter mooring line parameters

Cathodic Protection Anode Sizing

Calculate number of sacrificial anodes for offshore structure protection

Offshore

Surface Area SA (m²)

Current Density CD (mA/m²)

Design Life (years)

Anode Weight AW (kg)

Anode Capacity (A·h/kg, default 780)

Utilisation Factor (default 0.85)

Enter structure and anode parameters

Wind Drag Force on Cylinder

Calculate wind drag force on exposed offshore members or topsides

Offshore

Wind Speed V (m/s)

Member Diameter D (m)

Exposed Length L (m)

Drag Coefficient Cd (default 0.5)

Air Density ρ (kg/m³, default 1.225)

Formula: F = ½ ρ Cᵩ A V² (A = D × L)

Enter wind and member parameters

Current Drag Force on Cylinder

Calculate hydrodynamic drag force from ocean current on a tubular member

Offshore

Current Velocity Vc (m/s)

Member Diameter D (m)

Member Length L (m)

Drag Coeff Cd (default 0.7)

Water Density ρ (kg/m³, default 1025)

Formula: F = ½ ρ Cᵩ D L V²

Enter current and member parameters

Pile Axial Capacity (API RP 2A)

Calculate skin friction and end bearing capacity of driven piles

Offshore

Pile Diameter D (m)

Pile Length L (m)

Unit Skin Friction fs (kPa)

Unit End Bearing qb (kPa)

Qt = Qs + Qb Qs = fᵢ Aᵢ, Qb = qᢃ Aᢃ

Enter pile dimensions and soil parameters

Scour Depth Estimation

Estimate equilibrium scour depth around a vertical pile (Sumer & Fredsoe)

Offshore

Pile Diameter D (m)

Keulegan-Carpenter Number KC

Flow Type

Sumer & Fredsoe: Steady: S/D=1.3 Wave: S/D=0.1(KC–6) for KC>6

Enter pile and flow parameters

Pipeline / Spool Buoyancy Check

Check net buoyancy of a submerged pipeline or cylindrical structure

Offshore

Outer Diameter OD (m)

Length L (m)

Steel Weight (kN)

Content Weight (kN)

Coating Weight (kN)

Seawater Density ρ (kg/m³, default 1025)

Enter pipeline dimensions and weights

Pipeline Free Span VIV Check

Check vortex-induced vibration onset for free-spanning pipelines (DNV-RP-F105)

Offshore

Outer Diameter OD (m)

Free Span Length L (m)

Young's Modulus E (GPa)

Second Moment of Area I (m⁴)

Mass per Unit Length (kg/m)

Current Velocity Vc (m/s)

fn = C√(EI/mL⁴)/(2π) Vr = Vc/(fn×D) VIV onset: Vr = 1–10

Enter span dimensions and current velocity

Tubular Joint Classification

Classify jacket tubular joints as K, T/Y, X or KT per API RP 2A

Offshore

Chord OD (mm)

Brace 1 OD (mm)

Brace 2 OD (mm, 0 if single)

Brace 1 Angle (deg)

Brace 2 Angle (deg)

β₁ = d₁/D Classification: K (balanced), T/Y (unbalanced), X (through-brace)

Enter chord and brace dimensions

SCF Calculator (Efthymiou)

Stress Concentration Factor for T/Y tubular joints using Efthymiou equations

Offshore

Chord OD D (mm)

Chord Wall Thickness T (mm)

Brace OD d (mm)

Brace Wall Thickness t (mm)

Gap / Chord Length L (mm)

Brace Angle θ (deg)

Efthymiou (1988): β = d/D, γ = D/2T, τ = t/T, η = 2L/D

Enter joint dimensions to calculate SCF

Fatigue Life Estimator (S-N)

Estimate fatigue life of offshore joints using DNV-GL S-N curves and Palmgren-Miner rule

Offshore

Stress Range ΔS (MPa)

SCF (default 1.0)

S-N Curve

Annual Cycles (default 5× 10⁶)

N = 10^logΑ / (ΔS×SCF)^m DNV-GL RP-C203 S-N curves

Enter stress range and SCF

Rigging Load & Sling Tension

Calculate sling tensions and minimum WLL for offshore lifts per DNVGL-ST-N001

Offshore

Lift Weight W (tonnes)

Number of Sling Legs

Sling Angle from Vertical (deg)

Dynamic Amplification Factor DAF (default 1.3)

Safety Factor (default 3)

T = (W×DAF) / (n×cosθ) Min WLL = T × SF

Enter lift weight and rigging configuration

API RP 2A Unity Check

Unity Check for tubular members under combined axial and bending stresses (WSD)

Offshore

Axial Stress fa (MPa)

Bending Stress fb (MPa)

Shear Stress fv (MPa)

Yield Strength Fy (MPa, default 345)

Outer Diameter OD (mm)

Wall Thickness WT (mm)

Member Length L (m)

UC = fa/Fa + fb/Fb ≤ 1.0 API RP 2A-WSD §3.2

Enter member stresses and dimensions

⚠️

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