Common construction conversions: 1 in = 25.4 mm, 1 m = 3.281 ft, 1 m² = 10.764 ft², 1 m³ = 1.308 yd³, 1 tonne = 1.102 US tons, 1 kip = 4.448 kN, and 1 MPa = 145.04 psi (1 N/mm² = 1 MPa). Pick a quantity and units below to convert any value.
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Construction Unit Converter
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1 metre (m) =
3.28084foot (ft)
millimetre (mm)
1,000
centimetre (cm)
100
kilometre (km)
0.001
inch (in)
39.3701
yard (yd)
1.09361
mile (mi)
0.000621371
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Construction Conversions at a Glance
From
To
Multiply by
inch
mm
25.4
foot
m
0.3048
m²
ft²
10.764
m³
yd³
1.308
m³
ft³
35.315
yd³
m³
0.7646
tonne
US short ton
1.1023
kN
lbf
224.81
kip
kN
4.448
tonne-force
kN
9.807
MPa (N/mm²)
psi
145.04
ksi
MPa
6.895
kPa (kN/m²)
psf
20.885
bar
psi
14.504
kgf/cm²
kPa
98.07
Worked Example
Convert a concrete strength of 30 MPa to psi:
1 MPa = 145.04 psi
30 × 145.04 = 4,351 psi
Convert a 12 kip column load to kN: 12 × 4.448 = 53.4 kN.
How the Converter Works
Every unit is stored as an exact factor to its SI base unit (metre, m², m³, kg, newton, pascal). The value is converted to SI and then to the target unit, so any pair converts with the same precision. Inches, feet, pounds and gallons use their exact international definitions; force units use standard gravity, 9.80665 m/s².
Frequently Asked Questions
How do I convert MPa to psi?
Multiply by 145.04. Concrete of 25 MPa is about 3,626 psi; 4,000 psi concrete is about 27.6 MPa.
How many cubic yards are in a cubic metre?
1.308 cubic yards. One cubic yard is 0.7646 m³.
How do I convert kN to tonnes?
Divide by 9.807 to get tonnes-force. 100 kN is about 10.2 tf. Many engineers round to 10 kN per tonne for quick checks.
How do I convert a column load from kips to kN?
Multiply by 4.448. A 12 kip column load is 12 × 4.448 = 53.4 kN. To go back, divide kN by 4.448.
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