| To Convert From | To | Multiply by |
| inch | meter (m) | .0254 |
| inch | millimeter (mm) | 25.4 |
| ounce mass | kilogram (kg) | .0283 |
| ounce force | newton (N) | .278 |
| pound mass | kilograms (kg) | .4536 |
| pound force | newton (N) | 4.4482 |
| pound force/inch | newton/millimeter (N/mm) | .1751 |
| pound force/inch2 (psi) | megapascal (MPa) | .006895 |
| pound force inch | newton-millimeter (N/mm) | 112.9848 |
| pound force foot | newton-meter (N/m) | 1.3558 |
| kilogram force | newton (N) | 9.8066 |
| degree (angle) | radian (rad) | .01745 |
| minute (angle) | radian (rad) | .0002908 |
| degree F | degree Celsius (C) | (F-32)/1.8 |
Circumference of a circle - multiply diameter by 3.1416
Diameter of a circle - multiply circumference by .31831
Area of a rectangle - multiply length by breadth
Area of a triangle - multiply base by 1/2 perpendicular height
Area of an ellipse - multiply product of both diameters by .7854
Area of a parallelogram - multiply base by altitude
Side of an inscribed square - multiply diameter by 0.7071 or multiply circumference by 0.2251 or divide circumference by 4.4428
Side of an Inscribed cube - multiply radius of sphere by 1.1547
Side of an equal square - multiply diameter by .8862
Surface of a sphere - square the diameter and multiply by 3.1416
Volume of a sphere - cube the diameter and multiply by .5236
*The side of a square multiplied by 1.4142 equals diameter of its circumscribing circle
*The side of a square multiplied by 4.443 equals circumference of its circumscribing circle
*The side of a square multiplied by 1.128 equals diameter of an equal circle
*The side of a square multiplied by 3.547 equals circumference of an equal circle
*To find the gallon capacity of tanks (given the dimensions of a cylinder is in inches): square the diameter of the cylinder, multiply by the length and by .0034.
| GIVEN | TO FIND | RULE |
| The taper per foot | The taper per inch | Divide the taper per foot by 12 |
| The taper per inch | The taper per foot | Multiply the taper per inch by 12 |
| End diameters and length of taper in inches | The taper per foot | Subtract small diameter from large;divide by length of taper, and multiply quotient by 12 |
| Large diameter and length of taper in inches, and taper per foot | Diameter at small end in inches | Divide taper per foot by 12; multiply by length of taper, and subtract result from large diameter |
| Small diameter and length of taper in inches, and taper per foot | Diameter at large end in inches | Divide taper per foot by 12; multiply by length of taper, and add result to small diameter |
| The taper per foot and two diameters in inches | Distance between two given diameters in inches | Subtract small diameter from large; divide remainder by taper per foot, and multiply quotient by 12 |
| The taper per foot | Amount of taper in a certain length given in inches | Divide taper per foot by 12; multiply by given length of tapered part |