Quick Common Conversions & Formula Tables
These are 3 tables with quick common conversions and formulas for the following:
- Metric conversions for linear, torque, and force.
- Rules relative to the circle to find the circumference, diameter, radius, the side of an inscribed square, and the side of an equal square.
- Rules relative to the circle for a square, to find the area of a circle, and to find the surface of a sphere or globe.
We hope you find these useful.
Metric Conversions
| Linear | Multiply INCHES |
by 25.4 | to get MILLIMETERS (MM) |
|---|---|---|---|
| Multiply FEET |
by 0.3048 | to get METERS (M) | |
| Multiply INCHES |
by 2.54 | to get CENTIMETERS (CM) | |
| Multiply MILLIMETERS (MM) |
by 0.03937 | to get INCHES | |
| Multiply METERS (M) |
by 3.281 | to get FEET | |
| Multiply CENTIMETERS (CM) |
by 0.3937 | to get INCHES | |
| Torque | Multiply INCH-POUNDS |
by 0.11298 | to get NEWTON-METERS (Nm) |
| Multiply FOOT-POUNDS |
by 1.3558 | to get NEWTON-METERS (Nm) | |
| Multiply NEWTON-METERS |
by 8.851 | to get INCH-POUNDS | |
| Multiply NEWTON-METERS |
by 0.7376 | to get FOOT-POUNDS | |
| Force | Multiply POUNDS |
by 0.00445 | to get KILO-NEWTONS (kN) |
| Multiply KILO-NEWTONS |
by 224.72 | to get POUNDS |
Rules Relative to the Circle
| To Find Circumference | Multiply diameter by |
3.1416 |
|---|---|---|
| Or divide diameter by | 0.3183 | |
| To Find Diameter |
Multiply circumference by |
0.3183 |
| Or divide circumference by | 3.1416 | |
| To Find Radius | Multiply circumference by |
0.15915 |
| Or divide circumference by | 6.28318 | |
| To Find Side of an Inscribed Square | Multiply diameter by |
0.7071 |
| Or multiply circumference by |
0.2251 | |
| Or divide circumference by | 4.4428 | |
| To Find Side of an Equal Square | Multiply diameter by | 0.8862 |
| Or divide diameter by |
1.1284 | |
| Or multiply circumference by |
0.2821 | |
| Or divide circumference by | 3.545 |
Additional Rules
| Square | A side multiplied by 1.4142 equals diameter of its circumscribing circle |
|---|---|
| A side multiplied by 4.443 equals circumference of its circumscribing circle | |
| A side multiplied by 1.128 equals diameter of an equal side | |
| A side multiplied by 3.547 equals circumference of an equal circle | |
| To Find the area of a Circle |
Multiply the circumference by one-quarter of the diameter |
| Or multiply the square of diameter by 0.7854 | |
| Or multiply the square of circumference by 0.7958 | |
| Or multiply the square of 1/2 diameter by 3.1416 | |
| To Find the Surface of A Sphere or Globe |
Multiply the diameter by the circumference |
| Or multiply the square of a diameter by 3.1416 | |
| Or multiply four times the square of radius by 3.1416 |
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