| femtosecond | 1 fs | 2 fs | 3 fs | 4 fs | 5 fs | 6 fs | 7 fs | 8 fs | 9 fs | 10 fs | 11 fs | 12 fs | 13 fs | 14 fs | 15 fs | 16 fs | 17 fs | 18 fs | 19 fs | 20 fs | 21 fs | 22 fs | 23 fs | 24 fs | 25 fs | 26 fs | 27 fs | 28 fs | 29 fs | 30 fs | 31 fs | 32 fs | 33 fs | 34 fs | 35 fs | 36 fs | 37 fs | 38 fs | 39 fs | 40 fs | 41 fs | 42 fs | 43 fs | 44 fs | 45 fs | 46 fs | 47 fs | 48 fs | 49 fs | 50 fs | 51 fs | 52 fs | 53 fs | 54 fs | 55 fs | 56 fs | 57 fs | 58 fs | 59 fs | 60 fs | 61 fs | 62 fs | 63 fs | 64 fs | 65 fs | 66 fs | 67 fs | 68 fs | 69 fs | 70 fs | 71 fs | 72 fs | 73 fs | 74 fs | 75 fs | 76 fs | 77 fs | 78 fs | 79 fs | 80 fs | 81 fs | 82 fs | 83 fs | 84 fs | 85 fs | 86 fs | 87 fs | 88 fs | 89 fs | 90 fs | 91 fs | 92 fs | 93 fs | 94 fs | 95 fs | 96 fs | 97 fs | 98 fs | 99 fs | 100 fs |
| helek | 3.0 × 10-16 helek | 6.0 × 10-16 helek | 9.0 × 10-16 helek | 1.2 × 10-15 helek | 1.5 × 10-15 helek | 1.8 × 10-15 helek | 2.1 × 10-15 helek | 2.4 × 10-15 helek | 2.7 × 10-15 helek | 3.0 × 10-15 helek | 3.3 × 10-15 helek | 3.6 × 10-15 helek | 3.9 × 10-15 helek | 4.2 × 10-15 helek | 4.5 × 10-15 helek | 4.8 × 10-15 helek | 5.1 × 10-15 helek | 5.4 × 10-15 helek | 5.7 × 10-15 helek | 6.0 × 10-15 helek | 6.3 × 10-15 helek | 6.6 × 10-15 helek | 6.9 × 10-15 helek | 7.2 × 10-15 helek | 7.5 × 10-15 helek | 7.8 × 10-15 helek | 8.1 × 10-15 helek | 8.4 × 10-15 helek | 8.7 × 10-15 helek | 9.0 × 10-15 helek | 9.3 × 10-15 helek | 9.6 × 10-15 helek | 9.9 × 10-15 helek | 1.02 × 10-14 helek | 1.05 × 10-14 helek | 1.08 × 10-14 helek | 1.11 × 10-14 helek | 1.14 × 10-14 helek | 1.17 × 10-14 helek | 1.2 × 10-14 helek | 1.23 × 10-14 helek | 1.26 × 10-14 helek | 1.29 × 10-14 helek | 1.32 × 10-14 helek | 1.35 × 10-14 helek | 1.38 × 10-14 helek | 1.41 × 10-14 helek | 1.44 × 10-14 helek | 1.47 × 10-14 helek | 1.5 × 10-14 helek | 1.53 × 10-14 helek | 1.56 × 10-14 helek | 1.59 × 10-14 helek | 1.62 × 10-14 helek | 1.65 × 10-14 helek | 1.68 × 10-14 helek | 1.71 × 10-14 helek | 1.74 × 10-14 helek | 1.77 × 10-14 helek | 1.8 × 10-14 helek | 1.83 × 10-14 helek | 1.86 × 10-14 helek | 1.89 × 10-14 helek | 1.92 × 10-14 helek | 1.95 × 10-14 helek | 1.98 × 10-14 helek | 2.01 × 10-14 helek | 2.04 × 10-14 helek | 2.07 × 10-14 helek | 2.1 × 10-14 helek | 2.13 × 10-14 helek | 2.16 × 10-14 helek | 2.19 × 10-14 helek | 2.22 × 10-14 helek | 2.25 × 10-14 helek | 2.28 × 10-14 helek | 2.31 × 10-14 helek | 2.34 × 10-14 helek | 2.37 × 10-14 helek | 2.4 × 10-14 helek | 2.43 × 10-14 helek | 2.46 × 10-14 helek | 2.49 × 10-14 helek | 2.52 × 10-14 helek | 2.55 × 10-14 helek | 2.58 × 10-14 helek | 2.61 × 10-14 helek | 2.64 × 10-14 helek | 2.67 × 10-14 helek | 2.7 × 10-14 helek | 2.73 × 10-14 helek | 2.76 × 10-14 helek | 2.79 × 10-14 helek | 2.82 × 10-14 helek | 2.85 × 10-14 helek | 2.88 × 10-14 helek | 2.91 × 10-14 helek | 2.94 × 10-14 helek | 2.97 × 10-14 helek | 3.0 × 10-14 helek |
Femtosecond is equal to 10-15second (unit of time), comes from a combination of the metric prefix femto (f) with the second (s). Plural name is femseconds with symbol is fs.
| 1 femtoseconds = 3.0E-16 heleks | 6 femtoseconds = 1.8E-15 heleks |
| 2 femtoseconds = 6.0E-16 heleks | 7 femtoseconds = 2.1E-15 heleks |
| 3 femtoseconds = 9.0E-16 heleks | 8 femtoseconds = 2.4E-15 heleks |
| 4 femtoseconds = 1.2E-15 heleks | 9 femtoseconds = 2.7E-15 heleks |
| 5 femtoseconds = 1.5E-15 heleks | 10 femtoseconds = 3.0E-15 heleks |
A helek is 3⅓ seconds or 1/18 minute.
| 1 heleks = 3.3333333333333E+15 femtoseconds | 6 heleks = 2.0E+16 femtoseconds |
| 2 heleks = 6.6666666666667E+15 femtoseconds | 7 heleks = 2.3333333333333E+16 femtoseconds |
| 3 heleks = 1.0E+16 femtoseconds | 8 heleks = 2.6666666666667E+16 femtoseconds |
| 4 heleks = 1.3333333333333E+16 femtoseconds | 9 heleks = 3.0E+16 femtoseconds |
| 5 heleks = 1.6666666666667E+16 femtoseconds | 10 heleks = 3.3333333333333E+16 femtoseconds |
| 1 femtoseconds = 3.0 × 10-16 heleks |
| 1 heleks = 3.3333333333333 × 1015 femtoseconds |