| picometer | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm | 12 pm | 13 pm | 14 pm | 15 pm | 16 pm | 17 pm | 18 pm | 19 pm | 20 pm | 21 pm | 22 pm | 23 pm | 24 pm | 25 pm | 26 pm | 27 pm | 28 pm | 29 pm | 30 pm | 31 pm | 32 pm | 33 pm | 34 pm | 35 pm | 36 pm | 37 pm | 38 pm | 39 pm | 40 pm | 41 pm | 42 pm | 43 pm | 44 pm | 45 pm | 46 pm | 47 pm | 48 pm | 49 pm | 50 pm | 51 pm | 52 pm | 53 pm | 54 pm | 55 pm | 56 pm | 57 pm | 58 pm | 59 pm | 60 pm | 61 pm | 62 pm | 63 pm | 64 pm | 65 pm | 66 pm | 67 pm | 68 pm | 69 pm | 70 pm | 71 pm | 72 pm | 73 pm | 74 pm | 75 pm | 76 pm | 77 pm | 78 pm | 79 pm | 80 pm | 81 pm | 82 pm | 83 pm | 84 pm | 85 pm | 86 pm | 87 pm | 88 pm | 89 pm | 90 pm | 91 pm | 92 pm | 93 pm | 94 pm | 95 pm | 96 pm | 97 pm | 98 pm | 99 pm | 100 pm |
| metric inch | 2.5 × 10-9 in (metric) | 5.0 × 10-9 in (metric) | 7.5 × 10-9 in (metric) | 1.0 × 10-8 in (metric) | 1.25 × 10-8 in (metric) | 1.5 × 10-8 in (metric) | 1.75 × 10-8 in (metric) | 2.0 × 10-8 in (metric) | 2.25 × 10-8 in (metric) | 2.5 × 10-8 in (metric) | 2.75 × 10-8 in (metric) | 3.0 × 10-8 in (metric) | 3.25 × 10-8 in (metric) | 3.5 × 10-8 in (metric) | 3.75 × 10-8 in (metric) | 4.0 × 10-8 in (metric) | 4.25 × 10-8 in (metric) | 4.5 × 10-8 in (metric) | 4.75 × 10-8 in (metric) | 5.0 × 10-8 in (metric) | 5.25 × 10-8 in (metric) | 5.5 × 10-8 in (metric) | 5.75 × 10-8 in (metric) | 6.0 × 10-8 in (metric) | 6.25 × 10-8 in (metric) | 6.5 × 10-8 in (metric) | 6.75 × 10-8 in (metric) | 7.0 × 10-8 in (metric) | 7.25 × 10-8 in (metric) | 7.5 × 10-8 in (metric) | 7.75 × 10-8 in (metric) | 8.0 × 10-8 in (metric) | 8.25 × 10-8 in (metric) | 8.5 × 10-8 in (metric) | 8.75 × 10-8 in (metric) | 9.0 × 10-8 in (metric) | 9.25 × 10-8 in (metric) | 9.5 × 10-8 in (metric) | 9.75 × 10-8 in (metric) | 1.0 × 10-7 in (metric) | 1.025 × 10-7 in (metric) | 1.05 × 10-7 in (metric) | 1.075 × 10-7 in (metric) | 1.1 × 10-7 in (metric) | 1.125 × 10-7 in (metric) | 1.15 × 10-7 in (metric) | 1.175 × 10-7 in (metric) | 1.2 × 10-7 in (metric) | 1.225 × 10-7 in (metric) | 1.25 × 10-7 in (metric) | 1.275 × 10-7 in (metric) | 1.3 × 10-7 in (metric) | 1.325 × 10-7 in (metric) | 1.35 × 10-7 in (metric) | 1.375 × 10-7 in (metric) | 1.4 × 10-7 in (metric) | 1.425 × 10-7 in (metric) | 1.45 × 10-7 in (metric) | 1.475 × 10-7 in (metric) | 1.5 × 10-7 in (metric) | 1.525 × 10-7 in (metric) | 1.55 × 10-7 in (metric) | 1.575 × 10-7 in (metric) | 1.6 × 10-7 in (metric) | 1.625 × 10-7 in (metric) | 1.65 × 10-7 in (metric) | 1.675 × 10-7 in (metric) | 1.7 × 10-7 in (metric) | 1.725 × 10-7 in (metric) | 1.75 × 10-7 in (metric) | 1.775 × 10-7 in (metric) | 1.8 × 10-7 in (metric) | 1.825 × 10-7 in (metric) | 1.85 × 10-7 in (metric) | 1.875 × 10-7 in (metric) | 1.9 × 10-7 in (metric) | 1.925 × 10-7 in (metric) | 1.95 × 10-7 in (metric) | 1.975 × 10-7 in (metric) | 2.0 × 10-7 in (metric) | 2.025 × 10-7 in (metric) | 2.05 × 10-7 in (metric) | 2.075 × 10-7 in (metric) | 2.1 × 10-7 in (metric) | 2.125 × 10-7 in (metric) | 2.15 × 10-7 in (metric) | 2.175 × 10-7 in (metric) | 2.2 × 10-7 in (metric) | 2.225 × 10-7 in (metric) | 2.25 × 10-7 in (metric) | 2.275 × 10-7 in (metric) | 2.3 × 10-7 in (metric) | 2.325 × 10-7 in (metric) | 2.35 × 10-7 in (metric) | 2.375 × 10-7 in (metric) | 2.4 × 10-7 in (metric) | 2.425 × 10-7 in (metric) | 2.45 × 10-7 in (metric) | 2.475 × 10-7 in (metric) | 2.5 × 10-7 in (metric) |
The picometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the metric system, equal to 1×10−12 m, or one trillionth ( 1 / 1000000000000 ) of a metre, which is the SI base unit of length.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| picometer | pm | ≡ 1×10-12 m | ≡ 1×10-12 m | Metric system SI |
| picometers | metric inches | picometers | metric inches |
|---|---|---|---|
| 1 | = 2.5E-9 | 4 | = 1.0E-8 |
| 1.5 | = 3.75E-9 | 4.5 | = 1.125E-8 |
| 2 | = 5.0E-9 | 5 | = 1.25E-8 |
| 2.5 | = 6.25E-9 | 5.5 | = 1.375E-8 |
| 3 | = 7.5E-9 | 6 | = 1.5E-8 |
A metric inch is a nickname for a preferred 1⁄4 subdivision of an ISO 2848 basic module, or 1⁄12 of a metric foot measuring 25 millimetres (0.984 in). A metric inch is 0.4 millimetres (0.016 in) shorter than an inch.
The term was similarly used to refer to the historical Soviet Bloc practice of spacing integrated circuit pins at 1⁄10 of a 25 mm "metric inch" length, instead of the western practice of 1⁄10 of an imperial inch.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| metric inch | in (metric) | = 0.016 in | = 0.0004 m | Metric system SI |
| metric inches | picometers | metric inches | picometers |
|---|---|---|---|
| 1 | = 400000000 | 4 | = 1600000000 |
| 1.5 | = 600000000 | 4.5 | = 1800000000 |
| 2 | = 800000000 | 5 | = 2000000000 |
| 2.5 | = 1000000000 | 5.5 | = 2200000000 |
| 3 | = 1200000000 | 6 | = 2400000000 |
| picometers | metric inches |
|---|---|
| 1 | = 2.5 × 10-9 |
| 400 000 000 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |