Conversion Factors
Conversion Factors
Here we present two tables of the conversion factors for customary and SI units related to paper products.
CUSTOMARY UNITS TO SI UNITS
| QUANTITY | OTHER UNITS | MULTIPLY BY | FOR SI UNIT |
|---|---|---|---|
| Grammage (mass on ream basis) | Pounds per ream (lb/ream) per 3000 square feet (lb/3000 ft2) | 1.6275 | Grams per square meter (g/m2) |
| Grammage (mass in grams per square meter) | Pounds per 1000 square feet (lb/1000 ft²) | 4.8824 | Grams per square meter (g/m2) |
| Thickness | Millimetres (mm) Mils (or points or thousandths of an inch) |
1000 25.4 |
Micrometers (µm) |
| Apparent density | Kilograms per cubic centimetre (g/cm²)Pounds per cubic foot (lb/ft²) | 1000 16.01846 |
Kilograms per square meter (kg/m2) |
| Tensile strenght | Kilograms-force per 15 millimetre width (kgf/15 mm) Pounds-force per inch (lbf/in) |
0.65378 0.175127 |
Kilonewtons per meter (kN/m) |
| Tensile index (replaced breaking length) | Kilometres breaking length (Km) | 9.80665 | Newtonmeters per gram (N m/g) |
| Tensile energy absorption (TEA) | Kilograms-force meters per square meter (Kgf m/m2) Foot pinds-force per square foot (ft lbf/ft2) |
9.80665 14.5939 |
Joules per square meter (J/m²) |
| Tearing strenght | Grams-force (gf) | 9.80665 | Millinewtons (mN) |
| Tear index (replaced tear factor) | Computed as 100 grams-force per gram per square meter (100 gf(g/m²)) | 0.0980665 | Millinewtons sq. meters per gram (mN m²/g) |
| Bursting strength | Kilograms-force per square centimetre (kgf/cm²) Pounds-force per square inch – psi (lbf/in²) |
98.0665 6.89476 |
Kilopascals (kPa) |
| Burst index (replaced burst factor) | computed as grams-force per square centimetre per gram per square meter ((gf/cm² /(g/m²)) | 0.0980665 | Kilopascals sq. meters per gram (kPa m²/g) |
| Z-direction strength properties (unit as appropriate) | Kilograms-force per square centimetre (kgf/cm²) Pounds-force per square inch (lbf/in²) Foot pounds-force per square inch (ft lbf/in²) |
98.0665 6.89476 2101.5 |
Kilopascals (kPa) Kilopascals (kPa) Joules per square meter (J/m²) |
| Concora Medium Test (CMT) | Kilograms-force (kgf) Pounds-force (lbf) |
9.80665 4.44822 |
Newtons (N) |
| Ring Crush Test (RCT) | Kilograms-force per centimetre (kgf/cm) Pounds-force (for a 6-inch length) (lbf/6 in) |
0.9806650.02919 | Kilonewtons per meter (kN/m) |
| Edgewise compressive strength (ECT) | Pounds-force per inch (lbf/in) | 0.175127 | Kilonewtons per meter (kN/m) |
| Flat crush resistance of corrugated board (FCT) | Kilograms-force per square centimetre (kgf/cm²) | 98.0665 | Kilopascals (kPa) |
| QUANTITY | OTHER UNITS | MULTIPLY BY | FOR SI UNIT |
|---|---|---|---|
| Grammage (mass on ream basis) | Pounds per ream (lb/ream) per 3000 square feet (lb/3000 ft2) | 1.6275 | Grams per square meter (g/m2) |
| Grammage (mass in grams per square meter) | Pounds per 1000 square feet (lb/1000 ft²) | 4.8824 | Grams per square meter (g/m2) |
| Thickness | Millimetres (mm) Mils (or points or thousandths of an inch) |
1000 25.4 |
Micrometers (µm) |
| Apparent density | Kilograms per cubic centimetre (g/cm²)Pounds per cubic foot (lb/ft²) | 1000 16.01846 |
Kilograms per square meter (kg/m2) |
| Tensile strenght | Kilograms-force per 15 millimetre width (kgf/15 mm) Pounds-force per inch (lbf/in) |
0.65378 0.175127 |
Kilonewtons per meter (kN/m) |
| Tensile index (replaced breaking length) | Kilometres breaking length (Km) | 9.80665 | Newtonmeters per gram (N m/g) |
| Tensile energy absorption (TEA) | Kilograms-force meters per square meter (Kgf m/m2) Foot pinds-force per square foot (ft lbf/ft2) |
9.80665 14.5939 |
Joules per square meter (J/m²) |
| Tearing strenght | Grams-force (gf) | 9.80665 | Millinewtons (mN) |
| Tear index (replaced tear factor) | Computed as 100 grams-force per gram per square meter (100 gf(g/m²)) | 0.0980665 | Millinewtons sq. meters per gram (mN m²/g) |
| Bursting strength | Kilograms-force per square centimetre (kgf/cm²) Pounds-force per square inch – psi (lbf/in²) |
98.0665 6.89476 |
Kilopascals (kPa) |
| Burst index (replaced burst factor) | computed as grams-force per square centimetre per gram per square meter ((gf/cm² /(g/m²)) | 0.0980665 | Kilopascals sq. meters per gram (kPa m²/g) |
| Z-direction strength properties (unit as appropriate) | Kilograms-force per square centimetre (kgf/cm²) Pounds-force per square inch (lbf/in²) Foot pounds-force per square inch (ft lbf/in²) |
98.0665 6.89476 2101.5 |
Kilopascals (kPa) Kilopascals (kPa) Joules per square meter (J/m²) |
| Concora Medium Test (CMT) | Kilograms-force (kgf) Pounds-force (lbf) |
9.80665 4.44822 |
Newtons (N) |
| Ring Crush Test (RCT) | Kilograms-force per centimetre (kgf/cm) Pounds-force (for a 6-inch length) (lbf/6 in) |
0.9806650.02919 | Kilonewtons per meter (kN/m) |
| Edgewise compressive strength (ECT) | Pounds-force per inch (lbf/in) | 0.175127 | Kilonewtons per meter (kN/m) |
| Flat crush resistance of corrugated board (FCT) | Kilograms-force per square centimetre (kgf/cm²) | 98.0665 | Kilopascals (kPa) |
LENGTH
| 1 meter | 1.094 yards |
| 1 centimetre | 0.394 inches |
| 1 millimetre | 0.039 inches |
| 1 yard | 0.914 meters |
| 1 foot | 0.305 meters |
| 1 inch | 2.54 centimetres |
WEIGHT
| 1 metric tonne | 0.984 long tons1.102 short tons |
| 1 kilogram | 2.306 pounds35.274 ounces |
| 1 gram | 0.035 ounces |
| 1 pound | 453.6 grams |
| 1 ounce | 28.35 grams |
SURFACE
| 1 square meter | 1.196 square yards10.764 square feet1550 square inches |
| 1 square centimetre | 0.155 square inches |
| 1 square millimetre | 0.002 square inches |
| 1 acre | 0.4046 hectare |
| 1 square yard | 0.836 square meters |
| 1 square foot | 929 square centimetres0.0929 square meters |
| 1 square inch | 6.452 square centimetres |