Engineering Calculators
Applied technical calculations: structures and practical electricity.
HVAC Air Duct Sizing & Velocity Calculator (CFM / m³/h)
Calculate circular duct diameter ($D$) or rectangular section required from airflow in CFM or m³/h and recommended velocity.
Beam Deflection Calculator (Uniform & Center Load)
Calculate maximum deflection (δ_max) for simply supported beams subjected to a central point load.
BTU Calculator for Air Conditioners & HVAC
Calculate required cooling capacity in BTU/h for air conditioning based on room area and occupancy.
Gear Ratio & Output Speed Calculator
Calculate gear transmission ratio ($i = Z_2 / Z_1$) and rotational output speed ($N_2 = N_1 / i$) in RPM.
Conduction Heat Transfer Calculator (Fourier's Law)
Calculate conduction heat transfer rate ($q = (k \cdot A \cdot (T_1 - T_2)) / L$) through solid walls and thermal insulation.
Hydraulic & Pneumatic Cylinder Force Calculator (F = P A)
Calculate push (extension) and pull (retraction) forces in Newtons and tons for hydraulic or pneumatic cylinders ($F = P \cdot A$).
Ohm's Law Calculator (Voltage, Current, Resistance & Power)
Calculate Voltage ($V$), Current ($I$), Resistance ($R$), and Power ($P$) using fundamental Ohm's Law formulas.
Pipe Flow Rate & Fluid Velocity Calculator (Q = A v)
Calculate volumetric flow rate ($Q = A \cdot v = (\pi \cdot d^2 / 4) \cdot v$) and fluid velocity in pressurized circular pipes.
Resistor Color Code Calculator (4-Band)
Compute resistance value in Ohms (Ω) and tolerance of an axial resistor using 4-band color coding.
Reynolds Number & Flow Regime Calculator (Re)
Calculate dimensionless Reynolds number ($Re = (\rho \cdot v \cdot D) / \mu$) to classify fluid flow into laminar, transitional, or turbulent regimes.
Mechanical Stress & Strain Calculator (Hooke's Law σ = E ε)
Calculate axial stress ($σ = F / A$), unit strain ($\epsilon = \Delta L / L_0$), and elongation using Hooke's Law ($σ = E \cdot \epsilon$).
Linear Thermal Expansion Calculator (ΔL = α L₀ ΔT)
Calculate thermal elongation or contraction of solid materials ($\Delta L = \alpha \cdot L_0 \cdot \Delta T$) under temperature shifts.
Electrical Transformer Turns Ratio & Voltage Calculator
Calculate secondary voltage ($V_2$), secondary current ($I_2$), or turns ratio ($a = N_1 / N_2 = V_1 / V_2$) of ideal transformers.
Voltage Drop Calculator (AWG Cable & Distance)
Calculate voltage loss in volts and percentage (%) for electrical wiring based on distance and AWG wire gauge.