| femtowatt | 1 fW | 2 fW | 3 fW | 4 fW | 5 fW | 6 fW | 7 fW | 8 fW | 9 fW | 10 fW | 11 fW | 12 fW | 13 fW | 14 fW | 15 fW | 16 fW | 17 fW | 18 fW | 19 fW | 20 fW | 21 fW | 22 fW | 23 fW | 24 fW | 25 fW | 26 fW | 27 fW | 28 fW | 29 fW | 30 fW | 31 fW | 32 fW | 33 fW | 34 fW | 35 fW | 36 fW | 37 fW | 38 fW | 39 fW | 40 fW | 41 fW | 42 fW | 43 fW | 44 fW | 45 fW | 46 fW | 47 fW | 48 fW | 49 fW | 50 fW | 51 fW | 52 fW | 53 fW | 54 fW | 55 fW | 56 fW | 57 fW | 58 fW | 59 fW | 60 fW | 61 fW | 62 fW | 63 fW | 64 fW | 65 fW | 66 fW | 67 fW | 68 fW | 69 fW | 70 fW | 71 fW | 72 fW | 73 fW | 74 fW | 75 fW | 76 fW | 77 fW | 78 fW | 79 fW | 80 fW | 81 fW | 82 fW | 83 fW | 84 fW | 85 fW | 86 fW | 87 fW | 88 fW | 89 fW | 90 fW | 91 fW | 92 fW | 93 fW | 94 fW | 95 fW | 96 fW | 97 fW | 98 fW | 99 fW | 100 fW |
| megawatt | 1.0 × 10-21 MW | 2.0 × 10-21 MW | 3.0 × 10-21 MW | 4.0 × 10-21 MW | 5.0 × 10-21 MW | 6.0 × 10-21 MW | 7.0 × 10-21 MW | 8.0 × 10-21 MW | 9.0 × 10-21 MW | 1.0 × 10-20 MW | 1.1 × 10-20 MW | 1.2 × 10-20 MW | 1.3 × 10-20 MW | 1.4 × 10-20 MW | 1.5 × 10-20 MW | 1.6 × 10-20 MW | 1.7 × 10-20 MW | 1.8 × 10-20 MW | 1.9 × 10-20 MW | 2.0 × 10-20 MW | 2.1 × 10-20 MW | 2.2 × 10-20 MW | 2.3 × 10-20 MW | 2.4 × 10-20 MW | 2.5 × 10-20 MW | 2.6 × 10-20 MW | 2.7 × 10-20 MW | 2.8 × 10-20 MW | 2.9 × 10-20 MW | 3.0 × 10-20 MW | 3.1 × 10-20 MW | 3.2 × 10-20 MW | 3.3 × 10-20 MW | 3.4 × 10-20 MW | 3.5 × 10-20 MW | 3.6 × 10-20 MW | 3.7 × 10-20 MW | 3.8 × 10-20 MW | 3.9 × 10-20 MW | 4.0 × 10-20 MW | 4.1 × 10-20 MW | 4.2 × 10-20 MW | 4.3 × 10-20 MW | 4.4 × 10-20 MW | 4.5 × 10-20 MW | 4.6 × 10-20 MW | 4.7 × 10-20 MW | 4.8 × 10-20 MW | 4.9 × 10-20 MW | 5.0 × 10-20 MW | 5.1 × 10-20 MW | 5.2 × 10-20 MW | 5.3 × 10-20 MW | 5.4 × 10-20 MW | 5.5 × 10-20 MW | 5.6 × 10-20 MW | 5.7 × 10-20 MW | 5.8 × 10-20 MW | 5.9 × 10-20 MW | 6.0 × 10-20 MW | 6.1 × 10-20 MW | 6.2 × 10-20 MW | 6.3 × 10-20 MW | 6.4 × 10-20 MW | 6.5 × 10-20 MW | 6.6 × 10-20 MW | 6.7 × 10-20 MW | 6.8 × 10-20 MW | 6.9 × 10-20 MW | 7.0 × 10-20 MW | 7.1 × 10-20 MW | 7.2 × 10-20 MW | 7.3 × 10-20 MW | 7.4 × 10-20 MW | 7.5 × 10-20 MW | 7.6 × 10-20 MW | 7.7 × 10-20 MW | 7.8 × 10-20 MW | 7.9 × 10-20 MW | 8.0 × 10-20 MW | 8.1 × 10-20 MW | 8.2 × 10-20 MW | 8.3 × 10-20 MW | 8.4 × 10-20 MW | 8.5 × 10-20 MW | 8.6 × 10-20 MW | 8.7 × 10-20 MW | 8.8 × 10-20 MW | 8.9 × 10-20 MW | 9.0 × 10-20 MW | 9.1 × 10-20 MW | 9.2 × 10-20 MW | 9.3 × 10-20 MW | 9.4 × 10-20 MW | 9.5 × 10-20 MW | 9.6 × 10-20 MW | 9.7 × 10-20 MW | 9.8 × 10-20 MW | 9.9 × 10-20 MW | 1.0 × 10-19 MW |
The femtowatt (fW) is equal to one quadrillionth (10−15) of a watt. Technologically important powers that are measured in femtowatts are typically found in reference(s) to radio and radar receivers. For example, meaningful FM tuner performance figures for sensitivity, quieting and signal-to-noise require that the RF energy applied to the antenna input be specified. These input levels are often stated in dBf (decibels referenced to 1 femtowatt). This is 0.2739 microvolt across a 75-ohm load or 0.5477 microvolt across a 300-ohm load; the specification takes into account the RF input impedance of the tuner.
| 1 femtowatts = 1.0E-21 megawatts | 6 femtowatts = 6.0E-21 megawatts |
| 2 femtowatts = 2.0E-21 megawatts | 7 femtowatts = 7.0E-21 megawatts |
| 3 femtowatts = 3.0E-21 megawatts | 8 femtowatts = 8.0E-21 megawatts |
| 4 femtowatts = 4.0E-21 megawatts | 9 femtowatts = 9.0E-21 megawatts |
| 5 femtowatts = 5.0E-21 megawatts | 10 femtowatts = 1.0E-20 megawatts |
The megawatt (MW) is equal to one million (106) watts. Many events or machines produce or sustain the conversion of energy on this scale, including large electric motors; large warships such as aircraft carriers, cruisers, and submarines; large server farms or data centers; and some scientific research equipment, such as supercolliders, and the output pulses of very large lasers. A large residential or commercial building may use several megawatts in electric power and heat. On railways, modern high-powered electric locomotives typically have a peak power output of 5 or 6 MW, although some produce much more. The Eurostar, for example, uses more than 12 MW, while heavy diesel-electric locomotives typically produce/use 3 to 5 MW. U.S. nuclear power plants have net summer capacities between about 500 and 1300 MW.
| 1 megawatts = 1.0E+21 femtowatts | 6 megawatts = 6.0E+21 femtowatts |
| 2 megawatts = 2.0E+21 femtowatts | 7 megawatts = 7.0E+21 femtowatts |
| 3 megawatts = 3.0E+21 femtowatts | 8 megawatts = 8.0E+21 femtowatts |
| 4 megawatts = 4.0E+21 femtowatts | 9 megawatts = 9.0E+21 femtowatts |
| 5 megawatts = 5.0E+21 femtowatts | 10 megawatts = 1.0E+22 femtowatts |
| 1 femtowatts = 1.0 × 10-21 megawatts |
| 1 megawatts = 1.0 × 1021 femtowatts |