Engineering Tools — SmartUtilz | Civil, Electrical, Mechanical, Structural Calculators

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

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

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

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

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

Free Engineering Calculators