SI prefix converter
Convert deci to milli
1 d = 100 m — to convert deci to milli, multiply by 100.
Deci to milli calculator
1 d = 100 m
Deci to milli at a glance
1 d = 100 m
× 100
2 places right
10⁻¹ → 10⁻³
Deci to milli formula and conversion factor
Every SI prefix is a whole power of ten. Deci is 10⁻¹ of the base unit and milli is 10⁻³, so the two are exactly 2 powers of ten apart. That makes the factor exactly 100 — not an approximation, and it never changes with the unit you are measuring.
m = d × 100
10⁻¹ ÷ 10⁻³ = 10² = 100
1 d = 100 m
5 d = 500 m
100 d = 10,000 m
1000 d = 100,000 mDeci to milli conversion table
The values people look up most often, converted exactly. Read down for deci (d), across for milli (m).
In words: 10 d is 1,000 m, 100 d is 10,000 m, 500 d is 50,000 m, 1000 d is 100,000 m, 2000 d is 200,000 m, and 5000 d is 500,000 m.
| Deci (d) | Milli (m) |
|---|---|
| 0.0009 d | 0.09 m |
| 0.001 d | 0.1 m |
| 0.005 d | 0.5 m |
| 0.008 d | 0.8 m |
| 0.01 d | 1 m |
| 0.02 d | 2 m |
| 0.05 d | 5 m |
| 0.1 d | 10 m |
| 0.2 d | 20 m |
| 0.4 d | 40 m |
| 0.5 d | 50 m |
| 1 d | 100 m |
| 2 d | 200 m |
| 5 d | 500 m |
| 7 d | 700 m |
| 10 d | 1,000 m |
| 20 d | 2,000 m |
| 50 d | 5,000 m |
| 100 d | 10,000 m |
| 200 d | 20,000 m |
| 250 d | 25,000 m |
| 300 d | 30,000 m |
| 400 d | 40,000 m |
| 500 d | 50,000 m |
| 800 d | 80,000 m |
| 1,000 d | 100,000 m |
| 2,000 d | 200,000 m |
| 5,000 d | 500,000 m |
How to convert deci to milli without a calculator
Move the decimal point 2 places to the right, padding with zeros if you run out of digits. Going to a smaller prefix always makes the number bigger, because it takes more of a smaller unit to describe the same quantity.
The check that catches almost every mistake: compare the two exponents before you write the answer. Deci is 10⁻¹, milli is 10⁻³. If the prefix you are moving to is smaller, the digits must grow. If your answer moved the wrong way, you divided when you should have multiplied — the failure mode behind more than one real unit-conversion incident.
Deci to milli FAQ
- How do you convert deci to milli?
- To convert deci to milli, multiply by 100. That is the same as moving the decimal point 2 places to the right. For example, 1 d = 100 m, and 5 d = 500 m.
- How many milli are in 1 deci?
- There are exactly 100 milli in 1 deci. Deci (d) is 10⁻¹ of the base unit and milli (m) is 10⁻³, so they sit 2 powers of ten apart — a factor of exactly 100, with no rounding.
- Is 1 deci equal to 1 milli?
- No. Deci and milli are different SI prefixes 2 powers of ten apart. Deci is 100 times larger than milli, so 1 d = 100 m.
- Is the deci to milli conversion exact?
- Yes. Every SI prefix is a whole power of ten, so deci to milli is exactly × 100 with no rounding. This calculator shifts the decimal exponent instead of multiplying in binary floating point, so a value like 1.001 d returns an exact result rather than one with a trailing rounding error.
- Is deci bigger or smaller than milli?
- Deci is bigger. Deci is 10⁻¹ and milli is 10⁻³, which makes deci 100 times larger. The number always moves the other way: a quantity written in the smaller unit uses the bigger number.