Home Services Calculators Get in Touch
Technical Tools

Engineering
Calculators

Practical engineering calculators across geometry, electrical, conversions and friction welding.

Request a Calculator
Geometry

Circle Calculator

Enter any one value — all others calculate automatically.

r d C Area (A)
r = radius · d = diameter · C = circumference · A = area
mm
mm
mm
mm²

Tube Wall Area

Calculate cross-sectional wall area. Useful for weld force calculations.

OD/2 ID/2 Wall Area
Wall Area = π/4 × (OD² − ID²)
mm
mm
mm²
OD must be greater than ID.

Right-Angle Triangle

Enter any two known values to calculate the rest.

A B C α 90°
Enter any 2 known values · Angles in degrees
mm
mm
mm
deg
Please enter at least two known values.
Electrical

Ohm's Law

Enter any two values. V = IR  ·  P = VI

V
A
Ω
W
Please enter at least two values.

Single Phase — kW to Amps

Calculate current from power, voltage and power factor.

kW
V
—
A
Please check input values.

Three Phase — kW to Amps

Calculate per-phase current for three phase systems.

kW
V
—
A
Please check input values.

kVA Calculator

Calculate apparent power from voltage and current, or amps from kVA and voltage. Works in both directions.

—
V
A
kVA
kW
kW
Please enter voltage and either amps or kVA.

Horsepower to Kilowatts

Convert between HP and kW in both directions.

HP
kW

RMS ↔ Peak Voltage

Convert between RMS and peak voltage.

V
V
V DC
DC Bus Note: The DC bus voltage of a VFD is approximately equal to the peak of the incoming AC supply (RMS × √2 = ×1.414). For a 400V RMS supply the expected DC bus is approximately 565V DC. A DC bus reading significantly below this value may indicate supply issues, faulty rectifier diodes or a degraded capacitor bank. Drives will typically trip on undervoltage if the bus drops below approximately 85–90% of the nominal value.
Conversions

Length

Enter any value to convert between all units.

mm
cm
m
in
ft
thou

Temperature

Convert between Celsius, Fahrenheit and Kelvin.

°C
°F
K

Pressure

Convert between common pressure units.

bar
psi
kPa
MPa

Torque

Convert between common torque units.

Nm
ft·lb
in·lb
kgf·m
Friction Welding

In Development

Friction welding calculators including weld force, material area, pressure and flash allowance calculations are currently in development.

Check back soon, or use the request form below to suggest a specific calculator.