Deci (d)
The SI prefix deci (d): a factor of 10⁻¹, which is one tenth (10⁻¹).
What is a deci unit?
- Symbol
- d
- Quantity
- SI Prefixes
- Unit system
- SI
- Definition
- The SI prefix deci (d): a factor of 10⁻¹, which is one tenth (10⁻¹).
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for the decibel, deciliters in recipes and decimeters in school measurements. Rare in scientific work otherwise.
Deci in other si prefixes units
- 1 d = 1e-31 QQuetta
- 1 d = 1e-28 RRonna
- 1 d = 1e-25 YYotta
- 1 d = 1e-22 ZZetta
- 1 d = 1e-19 EExa
- 1 d = 1e-16 PPeta
- 1 d = 1e-13 TTera
- 1 d = 1e-10 GGiga
- 1 d = 1e-7 MMega
- 1 d = 0.0001 kKilo
- 1 d = 0.001 hHecto
- 1 d = 0.01 daDeca
- 1 d = 10 cCenti
- 1 d = 100 mMilli
- 1 d = 100000 µMicro
- 1 d = 100000000 nNano
- 1 d = 100000000000 pPico
- 1 d = 100000000000000 fFemto
- 1 d = 1e+17 aAtto
- 1 d = 1e+20 zZepto
- 1 d = 1e+23 yYocto
- 1 d = 1e+26 rRonto
- 1 d = 1e+29 qQuecto
- 1 d = 0.1 ×1Base unit (no prefix)
Deci quick reference
| Deci | Kilo | Milli | Quetta |
|---|---|---|---|
| 1 d | = 0.0001 k | = 100 m | = 1e-31 Q |
| 10 d | = 0.001 k | = 1000 m | = 1e-30 Q |
| 100 d | = 0.01 k | = 10000 m | = 1e-29 Q |
| 1000 d | = 0.1 k | = 100000 m | = 1e-28 Q |
Where the deci unit fits
The next smaller si prefixes unit is the centi unit (c). 1 d = 10 c, and 1 c = 0.1 d.
The next larger si prefixes unit is the base unit (×1). 1 d = 0.1 ×1, and 1 ×1 = 10 d.
Frequently asked questions
- How many kilo units are in one deci unit?
- One deci unit = 0.0001 k (kilo units).
- How many milli units are in one deci unit?
- One deci unit = 100 m (milli units).
- How many quetta units are in one deci unit?
- One deci unit = 1e-31 Q (quetta units).