📐 REFERENCE TABLES

Conversion Tables

Unit converter & reference tables for piping professionals.
Based on Trouvay & Cauvin — Piping Equipment references.

📏Length
Area
🧊Volume
🔧Pressure
🌡️Temperature
💧Flow Cv/Kv
⚖️Weight
💎Hardness
Interactive Converter

mm inches

mm
in
1 in = 25.4 mm

m feet & inches

m
ft in
1 ft = 0.3048 m  |  1 m = 3.28084 ft

mm fractional inches

mm
in
Nearest 1/64" fraction
LENGTH — mm ↔ inches (excerpt) Source: Trouvay & Cauvin
inmminmminmminmm
Interactive Converter

mm² in²

mm²
in²
1 in² = 645.16 mm²

cm² in²

cm²
in²
1 in² = 6.4516 cm²

ft²

ft²
1 m² = 10.7639 ft²
Interactive Converter

ft³

ft³
1 m³ = 35.3147 ft³

litres US gallons

L
US gal
1 US gal = 3.78541 L

litres UK gallons

L
UK gal
1 UK gal = 4.54609 L

litres barrels (petroleum)

L
bbl
1 bbl = 158.987 L
Interactive Converter

bar psi

bar
psi
1 bar = 14.5038 psi

MPa psi

MPa
psi
1 MPa = 145.038 psi

MPa bar

MPa
bar
1 MPa = 10 bar

kg/cm² psi

kg/cm²
psi
1 kg/cm² = 14.2233 psi
PRESSURE — bar ↔ psi (reference table) Source: Trouvay & Cauvin
barpsibarpsibarpsibarpsi
Interactive Converter

°C °F

°C
°F
°F = °C × 9/5 + 32  |  °C = (°F − 32) × 5/9
-40°
600°

°C K (Kelvin)

°C
K
K = °C + 273.15
TEMPERATURE — °C ↔ °F (reference table) Source: Trouvay & Cauvin
°C°F°C°F°C°F°C°F
Interactive Converter

Cv Kv

Cv
Kv
Kv = Cv × 0.865  |  Cv = Kv × 1.156
Cv (US): Flow of water at 60°F in US gallons/min through a valve with 1 psi pressure drop.
Kv (EU): Flow of water at 16°C in m³/h through a valve with 1 bar pressure drop.
Interactive Converter

kg lb (pounds)

kg
lb
1 kg = 2.20462 lb

kg/m lb/ft

kg/m
lb/ft
1 kg/m = 0.67197 lb/ft

tonne long ton / short ton

tonne
long ton
short ton
1 t = 0.9842 long ton = 1.1023 short ton
Steel Hardness Conversion (approximate)
Approximate conversions between hardness scales for steel. Values are not exact — use official ASTM E140 tables for certification.
HARDNESS — HB ↔ HRB ↔ HRC ↔ HV ↔ MPa Source: Trouvay & Cauvin / ASTM E140
HB (Brinell)HRB (Rockwell B)HRC (Rockwell C)HV (Vickers)Rm (MPa)