Conversion Tables & References
Conversion Factors
| From (Imperial) | To (Metric) | Multiply by |
|---|---|---|
| Inches (in) | Millimeters (mm) | 25.4 |
| Feet (ft) | Meters (m) | 0.305 |
| Yards (yd) | Meters (m) | 0.914 |
| Miles (m) | Kilometers (km) | 1.609 |
| Square inches (sq.in.) | Square centimeters (cm2) | 6.452 |
| Square feet (sq.ft.) | Square meters (m2) | 0.093 |
| Square yards (sq.yds.) | Square meters (m2) | 0.836 |
| Square miles (sq.m.) | Square kilometers (km2) | 2.590 |
| Cubic inches (in3) | Cubic centimeters (cm3) | 16.387 |
| Cubic feet (ft3) | Cubic meters (m3) | 0.028 |
| Cubic yards (yd3) | Cubic meters (m3) | 0.765 |
| Pints (pt) | Litres (l) | 0.568 |
| Imperial gallons (imp gal) | Litres (l) | 4.546 |
| Ounces (oz) | Grams (g) | 28.35 |
| Pounds (lb) | Kilograms (kg) | 0.454 |
| Tons (t) | Tonnes (t) | 1.016 |
| Pound per square inch (lb/sq.in.) | Kilogram per square meter (kg/m3) | 703.07 |
| Cubic feet/min (ft3/min) | Litres/min (l/min) | 28.32 |
| Pounds per foot (lb.ft) | Nanometer (nm) | 1.36 |
| Pounds per square inch (psi) | Bar (bar) | 0.0689 |
Socket Size Conversions
| Imperial | Metric |
|---|---|
| 5/32" | 4mm |
| 7/32" | 5.5mm |
| 5/16" | 8mm |
| 3/8" | 10mm |
| 7/16" | 11mm |
| 1/2" | 13mm |
| 9/16" | 14mm |
| 5/8" | 16mm |
| 3/4" | 19mm |
| 13/16" | 21mm |
| 7/8" | 22mm |
| 15/16" | 24mm |
| 1" | 25mm |
| 1-1/16" | 27mm |
| 1-1/8" | 29mm |
| 1-3/16" | 30mm |
| 1-1/4" | 32mm |
| 1-5/16" | 33mm |
| 1-3/8" | 35mm |
| 1-1/2" | 38mm |
| Imperial | Metric |
|---|---|
| 1-9/16" | 40mm |
| 1-5/18" | 41mm |
| 1-11/16" | 43mm |
| 1-3/4" | 45mm |
| 1-13/16" | 46mm |
| 1-7/8" | 48mm |
| 2" | 50mm |
| 2-1/16" | 52mm |
| 2-1/8" | 54mm |
| 2-3/16" | 55mm |
| 2-1/4" | 57mm |
| 2-3/8" | 60mm |
| 2-1/2" | 63mm |
| 2-9/16" | 65mm |
| 2-5/8" | 67mm |
| 2-3/4" | 70mm |
| 2-13/16" | 71mm |
| 2-15/16" | 75mm |
| 3" | 76mm |
| 3-1/8" | 80mm |
Tap Drills & Screw Threads
| Nominal diameter of threads in MM | Pitch in MM | Tapping drill diameter in MM |
|---|---|---|
| M2.0 | 0.25 | 1.75 |
| M2.0 | 0.40 | 1.60 |
| M2.2 | 0.25 | 1.95 |
| M2.2 | 0.45 | 1.75 |
| M2.5 | 0.35 | 2.15 |
| M2.5 | 0.45 | 2.05 |
| M3.0 | 0.35 | 2.65 |
| M3.0 | 0.50 | 2.50 |
| M3.5 | 0.35 | 3.15 |
| M3.5 | 0.60 | 2.90 |
| M4.0 | 0.50 | 3.50 |
| M4.0 | 0.70 | 3.30 |
| M4.5 | 0.50 | 4.00 |
| M4.5 | 0.75 | 3.70 |
| M5.0 | 0.50 | 4.50 |
| M5.0 | 0.80 | 4.20 |
| M6.0 | 0.75 | 5.20 |
| M6.0 | 1.00 | 5.00 |
| M7.0 | 0.75 | 6.20 |
| M7.0 | 1.00 | 6.00 |
| M8.0 | 1.25 | 7.20 |
| M8.0 | 1.00 | 7.00 |
| Nominal diameter of threads in MM | Pitch in MM | Tapping drill diameter in MM |
|---|---|---|
| M8.0 | 1.25 | 6.80 |
| M9.0 | 0.75 | 8.20 |
| M9.0 | 1.00 | 8.00 |
| M9.0 | 1.25 | 7.80 |
| M10.0 | 1.00 | 9.00 |
| M10.0 | 1.25 | 8.80 |
| M10.0 | 1.50 | 8.50 |
| M11.0 | 1.00 | 10.00 |
| M11.0 | 1.50 | 9.50 |
| M12.0 | 1.00 | 11.00 |
| M12.0 | 1.25 | 10.80 |
| M12.0 | 1.50 | 10.50 |
| M12.0 | 1.75 | 10.20 |
| M14.0 | 1.00 | 13.00 |
| M14.0 | 1.25 | 12.80 |
| M14.0 | 1.50 | 12.50 |
| M14.0 | 2.00 | 12.00 |
| M16.0 | 1.00 | 15.00 |
| M16.0 | 1.50 | 14.50 |
| M16.0 | 2.00 | 14.00 |
| M18.0 | 1.00 | 17.00 |
| M18.0 | 1.50 | 16.50 |
| Nominal diameter of threads in MM | Pitch in MM | Tapping drill diameter in MM |
|---|---|---|
| M18.0 | 2.00 | 16.00 |
| M18.0 | 2.50 | 15.50 |
| M20.0 | 1.00 | 19.00 |
| M20.0 | 1.50 | 18.50 |
| M20.0 | 2.00 | 18.00 |
| M20.0 | 2.50 | 17.50 |
| M22.0 | 1.00 | 21.00 |
| M22.0 | 1.50 | 20.50 |
| M22.0 | 2.00 | 20.00 |
| M22.0 | 2.00 | 19.50 |
| M24.0 | 1.00 | 23.00 |
| M24.0 | 1.50 | 22.50 |
| M24.0 | 2.00 | 22.00 |
| M24.0 | 3.00 | 21.00 |
| M25.0 | 1.50 | 23.50 |
| M25.0 | 2.00 | 23.00 |
| M27.0 | 1.50 | 25.50 |
| M27.0 | 3.00 | 24.00 |
| M28.0 | 1.50 | 26.50 |
| M30.0 | 1.50 | 28.50 |
| M30.0 | 3.50 | 26.50 |
| M32.0 | 1.50 | 30.50 |
| Nominal diameter of threads in MM | Pitch in MM | Tapping drill diameter in MM |
|---|---|---|
| M33.0 | 2.00 | 31.00 |
| M33.0 | 3.50 | 29.50 |
| M36.0 | 3.00 | 33.00 |
| M36.0 | 4.00 | 32.00 |
| M39.0 | 3.00 | 36.00 |
| M39.0 | 4.00 | 35.00 |
| M40.0 | 1.50 | 37.50 |
| M40.0 | 3.00 | 37.00 |
| M42.0 | 4.00 | 38.00 |
| M42.0 | 4.50 | 37.50 |
| M45.0 | 4.00 | 41.00 |
| M45.0 | 4.50 | 40.50 |
| M48.0 | 4.00 | 44.00 |
| M48.0 | 5.00 | 43.00 |
| M52.0 | 4.00 | 48.00 |
| M52.0 | 5.00 | 47.00 |
| M56.0 | 4.00 | 52.00 |
| M56.0 | 5.50 | 50.50 |
| M60.0 | 4.00 | 56.00 |
| M60.0 | 5.50 | 54.50 |
Electric Power Calculation
