Enzyme units (U)
The enzyme unit (U) is the amount of enzyme that converts one micromole of substrate per minute under specified conditions.
Convert enzyme units to any catalytic activity unit
1 enzyme unit = 1.6666667 × 10-8 katals
Quick facts
- Unit
- Enzyme unit (plural: enzyme units)
- Symbol
- U
- Measures
- Catalytic Activity
- System
- Units
- Equals
- 1.6666667 × 10-8 katals
- Definition
- One micromole per minute (1/60 µkat).
- Also written
- IU (enzyme), international unit of enzyme activity
1 enzyme unit in other units
| Katals | 1.6666667 × 10-8 kat |
| Microkatals | 0.01666666667 µkat |
| Nanokatals | 16.66666667 nkat |
What is an enzyme unit?
The enzyme unit (U) is the amount of enzyme that converts one micromole of substrate per minute under specified conditions. Clinical enzyme tests are reported in U/L.
Where the enzyme unit sits among catalytic activity units
The enzyme unit is number 3 of 7 on our scale of catalytic activity units, ordered from smallest to largest.
Enzyme units in real life
- Normal ALT in adults is about 7–56 U/L
Top enzyme unit conversions
Common amounts of enzyme units
- 0.1 U
- 0.2 U
- 0.3 U
- 0.4 U
- 0.5 U
- 0.6 U
- 0.7 U
- 0.8 U
- 0.9 U
- 1 U
- 1.5 U
- 2 U
- 2.5 U
- 3 U
- 3.5 U
- 4 U
- 4.5 U
- 5 U
- 6 U
- 7 U
- 7.5 U
- 8 U
- 9 U
- 10 U
- 11 U
- 12 U
- 13 U
- 14 U
- 15 U
- 16 U
- 17 U
- 18 U
- 19 U
- 20 U
- 21 U
- 22 U
- 23 U
- 24 U
- 25 U
- 26 U
- 27 U
- 28 U
- 29 U
- 30 U
- 31 U
- 32 U
- 33 U
- 34 U
- 35 U
- 36 U
- 37 U
- 38 U
- 39 U
- 40 U
- 41 U
- 42 U
- 43 U
- 44 U
- 45 U
- 46 U
- 47 U
- 48 U
- 49 U
- 50 U
- 51 U
- 52 U
- 53 U
- 54 U
- 55 U
- 56 U
- 57 U
- 58 U
- 59 U
- 60 U
- 61 U
- 62 U
- 63 U
- 64 U
- 65 U
- 66 U
- 67 U
- 68 U
- 69 U
- 70 U
- 71 U
- 72 U
- 73 U
- 74 U
- 75 U
- 76 U
- 77 U
- 78 U
- 79 U
- 80 U
- 81 U
- 82 U
- 83 U
- 84 U
- 85 U
- 86 U
- 87 U
- 88 U
- 89 U
- 90 U
- 91 U
- 92 U
- 93 U
- 94 U
- 95 U
- 96 U
- 97 U
- 98 U
- 99 U
- 100 U
- 110 U
- 120 U
- 130 U
- 140 U
- 150 U
- 160 U
- 170 U
- 180 U
- 190 U
- 200 U
- 210 U
- 220 U
- 230 U
- 240 U
- 250 U
- 260 U
- 270 U
- 280 U
- 290 U
- 300 U
- 310 U
- 320 U
- 330 U
- 340 U
- 350 U
- 360 U
- 370 U
- 380 U
- 390 U
- 400 U
- 410 U
- 420 U
- 430 U
- 440 U
- 450 U
- 460 U
- 470 U
- 480 U
- 490 U
- 500 U
- 600 U
- 700 U
- 800 U
- 900 U
- 1,000 U
- 1,200 U
- 1,500 U
- 2,000 U
- 2,500 U
- 3,000 U
- 4,000 U
- 5,000 U
- 10,000 U
Convert enzyme units to all 6 other units
Units
Convert to enzyme units
Frequently asked questions
What is an enzyme unit?
The enzyme unit (U) is the amount of enzyme that converts one micromole of substrate per minute under specified conditions.
How is the enzyme unit defined?
One micromole per minute (1/60 µkat).
How many katals are in an enzyme unit?
One enzyme unit equals 1.6666667e-8 katals.
How many microkatals are in an enzyme unit?
One enzyme unit equals 0.01666666667 microkatals.
How many nanokatals are in an enzyme unit?
One enzyme unit equals 16.66666667 nanokatals.