| 1 fW | = 9.4845165270003E-19 BTU/s TH |
| 2 fW | = 1.8969033054001E-18 BTU/s TH |
| 3 fW | = 2.8453549581001E-18 BTU/s TH |
| 4 fW | = 3.7938066108001E-18 BTU/s TH |
| 5 fW | = 4.7422582635002E-18 BTU/s TH |
| 6 fW | = 5.6907099162002E-18 BTU/s TH |
| 7 fW | = 6.6391615689002E-18 BTU/s TH |
| 8 fW | = 7.5876132216003E-18 BTU/s TH |
| 9 fW | = 8.5360648743003E-18 BTU/s TH |
| 10 fW | = 9.4845165270003E-18 BTU/s TH |
| 20 fW | = 1.8969033054001E-17 BTU/s TH |
| 30 fW | = 2.8453549581001E-17 BTU/s TH |
| 40 fW | = 3.7938066108001E-17 BTU/s TH |
| 50 fW | = 4.7422582635002E-17 BTU/s TH |
| 60 fW | = 5.6907099162002E-17 BTU/s TH |
| 70 fW | = 6.6391615689002E-17 BTU/s TH |
| 80 fW | = 7.5876132216003E-17 BTU/s TH |
| 90 fW | = 8.5360648743003E-17 BTU/s TH |
| 100 fW | = 9.4845165270003E-17 BTU/s TH |
| 200 fW | = 1.8969033054001E-16 BTU/s TH |
| 300 fW | = 2.8453549581001E-16 BTU/s TH |
| 400 fW | = 3.7938066108001E-16 BTU/s TH |
| 500 fW | = 4.7422582635002E-16 BTU/s TH |
| 600 fW | = 5.6907099162002E-16 BTU/s TH |
| 700 fW | = 6.6391615689002E-16 BTU/s TH |
| 800 fW | = 7.5876132216003E-16 BTU/s TH |
| 900 fW | = 8.5360648743003E-16 BTU/s TH |
| 1000 fW | = 9.4845165270003E-16 BTU/s TH |
| 2000 fW | = 1.8969033054001E-15 BTU/s TH |
| 4000 fW | = 3.7938066108001E-15 BTU/s TH |
| 5000 fW | = 4.7422582635002E-15 BTU/s TH |
| 7500 fW | = 7.1133873952503E-15 BTU/s TH |
| 10000 fW | = 9.4845165270003E-15 BTU/s TH |
| 25000 fW | = 2.3711291317501E-14 BTU/s TH |
| 50000 fW | = 4.7422582635002E-14 BTU/s TH |
| 100000 fW | = 9.4845165270003E-14 BTU/s TH |
| 1000000 fW | = 9.4845165270003E-13 BTU/s TH |
| 1000000000 fW | = 9.4845165270003E-10 BTU/s TH |