The TradesCalcPro Unit Converter is designed to make quick, accurate conversions across a wide range of technical units.
Whether you’re estimating project materials, checking energy usage, or comparing measurements across systems, this tool provides an instant way to translate between metric and imperial values.

It supports categories such as Weight/Mass, Length, Area, Volume, Temperature, Speed, Energy, Power, and Pressure — covering most of the conversions needed by tradespeople, maintenance staff, engineers, and DIY users.
Every conversion is based on standardized SI relationships and verified constants.
This ensures consistent, trustworthy results across disciplines — whether you’re sizing conductors, planning HVAC layouts, or verifying torque and load calculations.

All categories except Temperature use linear scaling via a base unit.
Temperature uses affine transformations due to offset zero points.

1. Length
Base unit: meter (m)
To meters = value × scale factor
From meters = base value ÷ target scale

mm = × 0.001
cm = × 0.01
m = × 1
km = × 1000
in = × 0.0254
ft = × 0.3048
yd = × 0.9144
mi = × 1609.344

2. Area
Base unit: square meter (m²)
To m² = value × scale factor

mm² = × 0.000001
cm² = × 0.0001
m² = × 1
km² = × 1,000,000
in² = × 0.00064516
ft² = × 0.09290304
yd² = × 0.83612736
acre = × 4046.8564224

3. Volume
Base unit: cubic meter (m³)
To m³ = value × scale factor

mL = × 0.000001
L = × 0.001
m³ = × 1
in³ = × 0.000016387064
ft³ = × 0.028316846592
gal (US) = × 0.003785411784

4. Weight / Mass
Base unit: kilogram (kg)
To kg = value × scale factor

mg = × 0.000001
g = × 0.001
kg = × 1
tonne = × 1000
oz = × 0.028349523125
lb = × 0.45359237

5. Speed
Base unit: meters per second (m/s)

m/s = × 1
km/h = ÷ 3.6
mph = × 0.44704
ft/s = × 0.3048

6. Energy
Base unit: joule (J)

J = × 1
kJ = × 1000
Wh = × 3600
kWh = × 3,600,000
BTU = × 1055.05585262

7. Power
Base unit: watt (W)

W = × 1
kW = × 1000
hp (metric) = × 735.49875

8. Pressure
Base unit: pascal (Pa)

Pa = × 1
kPa = × 1000
bar = × 100,000
psi = × 6894.757293168

9. Temperature
Conversion formulas:

°C → °F = (°C × 9 / 5) + 32
°C → K = °C + 273.15
°F → °C = (°F − 32) × 5 / 9
°F → K = ((°F − 32) × 5 / 9) + 273.15
K → °C = K − 273.15
K → °F = ((K − 273.15) × 9 / 5) + 32