Every engineering calculation. One platform.

ELE03

Ohm’s Law Calculator

Calculate voltage from current and resistance.

V = I × R

ELE04

Voltage Drop Calculator

Estimate DC or single-phase two-conductor voltage drop.

ΔV = 2 × L × I × ρ / A

ELE05

Wire / Cable Size Calculator

Estimate copper conductor area from current, length and allowable drop.

A = 2 × L × I × ρ / ΔV

STR06

Beam Deflection Calculator

Maximum deflection of a simply supported beam with a central point load.

δ = P L³ / (48 E I)

FLU07

Pipe Flow Calculator

Calculate volumetric flow from internal diameter and mean velocity.

Q = πD²v / 4

MEC08

Horsepower & Torque Calculator

Calculate metric power from torque and rotational speed.

P = T × RPM / 9549

ELE09

Electrical Power Calculator

Calculate DC electrical power.

P = V × I

ELE10

Three-Phase Power Calculator

Calculate balanced three-phase real power.

P = √3 × Vₗ × Iₗ × PF

MAT11

Weight of Steel Calculator

Calculate steel mass from volume and density.

m = L × W × T × ρ

Materials

GEN12

Pressure Converter

Convert bar to pascals.

Pa = bar × 100,000

General

GEN13

Power Converter

Convert kilowatts to mechanical horsepower.

hp = kW × 1.34102

General

FLU14

Reynolds Number Calculator

Determine pipe-flow regime using density, velocity, diameter and viscosity.

Re = ρvD / μ

FLU15

Pump Head & Power Calculator

Estimate hydraulic pump power from flow, head and efficiency.

P = ρgQH / η

HVC16

Heating Load Calculator

Estimate steady-state room heating load from U-value, area and temperature difference.

Q = U × A × ΔT

HVC17

Cooling Load Calculator

Estimate sensible cooling load from airflow and temperature change.

Q = ρ cₚ V̇ ΔT

MEC18

Gear Ratio Calculator

Calculate driven-to-driver gear ratio.

Ratio = N₂ / N₁

L = 2C + π(D+d)/2 + (D−d)²/(4C)

MEC19

Belt Length & Pulley Calculator

Estimate open-belt length from pulley diameters and centre distance.

MEC20

Bolt Torque Calculator

Estimate tightening torque from preload, diameter and nut factor.

T = K × F × d

MEC21

Stress Calculator

Calculate direct normal stress.

σ = F / A

STR22

Bending Stress Calculator

Calculate elastic bending stress from moment and section modulus.

σ = M / Z

STR23

Moment of Inertia Calculator

Second moment of area for a solid rectangle about its centroidal axis.

I = b h³ / 12

HVC24

Airflow & Duct Size Calculator

Calculate circular duct diameter from airflow and target velocity.

D = √(4Q / πv)

ELE25

Battery Runtime Calculator

Estimate battery runtime using usable capacity and load.

t = V × Ah × η / P

ELE26

AC Single-Phase Power Calculator

Calculate single-phase real power.

P = V × I × PF

ELE27

Power Factor Correction Calculator

Estimate capacitor reactive power required to improve power factor.

Qc = P(tan φ₁ − tan φ₂)

ELX28

Resistor Colour Code Calculator

Calculate resistance from the first two digits and multiplier.

R = (10a + b) × 10ᵐ

ELX29

Resistors in Series & Parallel

Equivalent resistance of two resistors in parallel.

R = R₁R₂ / (R₁ + R₂)

ELX30

Capacitors in Series & Parallel

Equivalent capacitance of two capacitors in series.

C = C₁C₂ / (C₁ + C₂)

ELX31

LED Resistor Calculator

Select a current-limiting resistor for an LED.

R = (Vₛ − Vƒ) / I

ELE32

Transformer Calculator

Calculate ideal secondary voltage from turns ratio.

V₂ = V₁ × N₂/N₁

ELE33

Motor Current Calculator

Estimate balanced three-phase motor line current.

I = P / (√3 V η PF)

ELE34

Generator Size Calculator

Estimate generator apparent power from real load and power factor.

S = P / PF

ELE35

Battery Bank Size Calculator

Estimate required amp-hour capacity.

Ah = Wh / (V × DoD × η)

NRG36

Solar Panel & Array Size Calculator

Estimate PV array power from daily energy and peak-sun hours.

P = E / (H × η)

Energy

ELE37

Cable Resistance Calculator

Calculate conductor resistance.

R = ρL/A

ELE38

Short-Circuit Current Calculator

Estimate symmetrical fault current from voltage and impedance.

Isc = V/Z

STR39

Beam Load & Reaction Calculator

Support reaction for a simply supported beam with a central point load.

R = P/2

STR40

Shear Force & Bending Moment Calculator

Maximum moment for a simply supported beam with central point load.

Mmax = PL/4

STR41

Column Buckling Calculator

Euler elastic critical load for an ideal column.

Pcr = π²EI/(KL)²

STR42

Section Modulus Calculator

Elastic section modulus of a solid rectangle.

Z = bh²/6

MAT43

Steel Beam Weight Calculator

Calculate beam mass from section area, length and steel density.

m = A L ρ

Materials

CIV44

Rebar Weight Calculator

Estimate reinforcement mass from bar diameter and length.

m ≈ d²L/162

CIV45

Concrete Mix Calculator

Estimate dry material volume using a selected dry-volume factor.

Vdry = Vwet × factor

CIV46

Retaining Wall Calculator

Estimate active lateral earth force per metre using Rankine theory.

Pa = ½KaγH²

GEO47

Foundation Bearing Capacity Calculator

Simple allowable bearing load from area and allowable pressure.

P = qallow × A

Geotechnical

CIV48

Drainage & Stormwater Runoff Calculator

Peak runoff using the Rational Method.

Q = 0.00278 C i A

FLU49

Pipe Pressure-Loss Calculator

Darcy–Weisbach pressure loss.

ΔP = f(L/D)ρv²/2

FLU50

Water Velocity Calculator

Calculate velocity from volumetric flow and pipe diameter.

v = 4Q/(πD²)

FLU51

Darcy–Weisbach Calculator

Calculate head loss in a circular pipe.

hf = f(L/D)v²/(2g)

hf = 10.67 L Q¹·⁸⁵²/(C¹·⁸⁵² d⁴·⁸⁷)

FLU52

Hazen–Williams Calculator

Estimate water head loss in SI units.

P₂ = P₁ + ρg(z₁−z₂) + ½ρ(v₁²−v₂²)

FLU53

Bernoulli Equation Calculator

Calculate pressure change from elevation and velocity changes.

HYD54

Hydraulic Cylinder Force Calculator

Calculate ideal extension force.

F = PπD²/4

Hydraulics

PNE55

Pneumatic Cylinder Force Calculator

Calculate ideal pneumatic extension force.

F = PπD²/4

Pneumatics

PRO56

Cv & Kv Valve Size Calculator

Estimate metric valve coefficient for liquids.

Kv = Q√(SG/ΔP)

Process

PRO57

Tank Volume Calculator

Volume of a vertical cylindrical tank.

V = πD²H/4

Process

PRO58

Tank Fill & Drain Time Calculator

Calculate fill time from usable volume and constant flow.

t = V/Q

Process

THM59

Heat Transfer Calculator

Steady heat transfer through a surface.

Q = U A ΔT

LMTD = (ΔT₁−ΔT₂)/ln(ΔT₁/ΔT₂)

THM60

Heat Exchanger LMTD Calculator

Log mean temperature difference for a two-end exchanger.

THM61

Thermal Expansion Calculator

Calculate unrestricted linear thermal expansion.

ΔL = αLΔT

THM62

Insulation Thickness & Heat-Loss Calculator

Planar conduction through insulation.

Q = kAΔT/t

THM63

Ideal Gas Law Calculator

Calculate absolute gas pressure.

P = nRT/V

FLU64

Air Density Calculator

Estimate dry-air density using the ideal gas law.

ρ = P/(RT)

HVC65

Relative Humidity & Dew Point Calculator

Approximate dew point using the Magnus equation.

Td = bγ/(a−γ)

HVC66

Psychrometric Calculator

Approximate moist-air humidity ratio.

W = 0.62198 Pv/(P−Pv)

HVC67

Fan Power Calculator

Estimate fan shaft power from airflow, pressure rise and efficiency.

P = QΔP/η

HVC68

Boiler Size Calculator

Add design margin to a calculated heating load.

Pboiler = Q × margin

FLU69

Pump Size Calculator

Estimate motor input power from flow, head and combined efficiency.

P = ρgQH/η

MEC70

Shaft Size Calculator

Size a solid circular shaft for pure torsion.

d = ∛(16T/πτ)

MEC71

Spring Rate Calculator

Rate of a close-coiled compression spring.

k = Gd⁴/(8D³n)

L10h = (C/P)³ × 10⁶/(60n)

MEC72

Bearing Life Calculator

Basic L10 life for a ball bearing.