Convert Milliseconds to Seconds
1 millisecond (ms) equals 0.001 seconds (s).
1 ms = 0.001 s
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millisecond to second converter to paste a column from Excel.
How to Convert Millisecond to Second
- 1 ms = 0.001 s
- 1 s = 1000 ms
- Example: convert 15 ms to s: 15 ms = 15 × 0.001 s = 0.015 s
Formula
s = ms ÷ 1000
Derivation from SI units:
- 1 ms = 10⁻³ s
- SI base unit: 9 192 631 770 periods of the caesium-133 hyperfine transition
Both units are defined exactly, so the factor is exact. Millisecond definition: millisecond; Second definition: second.
Worked examples
- A typical human reaction time of about 250 ms is 0.25 s.
250 ms × 0.001 = 0.25 s - One video frame at 60 fps lasts 16.7 ms, or 0.0167 s.
16.7 ms × 0.001 = 0.0167 s
Millisecond to Second conversion table
| Milliseconds (ms) | Seconds (s) |
|---|---|
| 1 ms | 0.001 s |
| 5 ms | 0.005 s |
| 10 ms | 0.01 s |
| 16.7 ms | 0.0167 s |
| 20 ms | 0.02 s |
| 33.3 ms | 0.0333 s |
| 50 ms | 0.05 s |
| 100 ms | 0.1 s |
| 150 ms | 0.15 s |
| 200 ms | 0.2 s |
| 250 ms | 0.25 s |
| 300 ms | 0.3 s |
| 500 ms | 0.5 s |
| 750 ms | 0.75 s |
| 1000 ms | 1 s |
| 1500 ms | 1.5 s |
| 2000 ms | 2 s |
| 5000 ms | 5 s |
| 10000 ms | 10 s |
| 30000 ms | 30 s |
| 60000 ms | 60 s |
| 3600000 ms | 3600 s |
Where it's used
Software, data loggers and control systems record time in milliseconds, while physics formulas and SI-derived units need seconds. The conversion is a division by 1000.
Millisecond to other time units
| Conversion | 1 ms equals |
|---|---|
| millisecond to second | 0.001 s |
| millisecond to minute | 0.00001666666667 min |
| millisecond to hour | 2.777777778 × 10⁻⁷ h |
| millisecond to day | 1.157407407 × 10⁻⁸ d |
Frequently asked questions
How do I convert ms to s?
Divide by 1000: 1500 ms = 1.5 s.
How many seconds are in 1 millisecond?
1 ms = 0.001 s.
How do I convert milliseconds to seconds?
Multiply the value in ms by 0.001, or divide it by 1000. For example, 15 ms × 0.001 = 0.015 s.
Is the ms to s conversion exact?
Yes. Both units are defined exactly, and 1 ms is exactly 0.001 s.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Milliseconds to Seconds. Retrieved October 17, 2026, from https://scientificconverters.com/time/milliseconds-to-seconds/
IEEE
Scientific Converters, "Convert Milliseconds to Seconds," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/time/milliseconds-to-seconds/