Bar to Millibar Converter
Enter the value that you want to convert bar to millibar (mbar) or millibar to bar.
1 bar = 1000.0000000 millibar
Formula: millibar = bar value × 1000.0000000
bar to millibar
10 bar = 10000.00000 millibar
Popular Pressure Converters:
Bar to Millibar: The Essentials
The Bar in Engineering
Bar (bar) is a unit of pressure measurement. 1 bar is equal to 1000.0000000 millibar.
The Millibar in Engineering
Millibar (mbar) is a unit of pressure measurement. 1 millibar is equal to 0.0010000 bar.
Pressure Units Across Industries
Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.
bar to millibar metric conversion table
| 0.01 bar | = | 10.00000 mbar |
| 0.1 bar | = | 100.00000 mbar |
| 1 bar | = | 1000.00000 mbar |
| 2 bar | = | 2000.00000 mbar |
| 3 bar | = | 3000.00000 mbar |
| 4 bar | = | 4000.00000 mbar |
| 5 bar | = | 5000.00000 mbar |
| 6 bar | = | 6000.00000 mbar |
| 7 bar | = | 7000.00000 mbar |
| 8 bar | = | 8000.00000 mbar |
| 9 bar | = | 9000.00000 mbar |
| 10 bar | = | 10000.00000 mbar |
| 11 bar | = | 11000.00000 mbar |
| 12 bar | = | 12000.00000 mbar |
| 13 bar | = | 13000.00000 mbar |
| 14 bar | = | 14000.00000 mbar |
| 15 bar | = | 15000.00000 mbar |
| 16 bar | = | 16000.00000 mbar |
| 17 bar | = | 17000.00000 mbar |
| 18 bar | = | 18000.00000 mbar |
| 19 bar | = | 19000.00000 mbar |
| 20 bar | = | 20000.00000 mbar |
| 30 bar | = | 30000.00000 mbar |
| 40 bar | = | 40000.00000 mbar |
| 50 bar | = | 50000.00000 mbar |
| 60 bar | = | 60000.00000 mbar |
| 70 bar | = | 70000.00000 mbar |
| 80 bar | = | 80000.00000 mbar |
| 90 bar | = | 90000.00000 mbar |
| 100 bar | = | 100000.00000 mbar |
| 200 bar | = | 200000.00000 mbar |
| 300 bar | = | 300000.00000 mbar |
| 400 bar | = | 400000.00000 mbar |
| 500 bar | = | 500000.00000 mbar |
| 600 bar | = | 600000.00000 mbar |
| 700 bar | = | 700000.00000 mbar |
| 800 bar | = | 800000.00000 mbar |
| 900 bar | = | 900000.00000 mbar |
| 1000 bar | = | 1000000.00000 mbar |
How to Convert Bar to Millibar?
We can convert bar to millibar by using an example.
Example:
Convert 20 Bar to Millibar?
We know 1 Bar = 1000.0000000 millibar; 1 Millibar = 0.0010000 bar.
20 bar = ___mbar
20 × 1000.0000000 = 20000.00000 mbar (we know 1 bar = 1000.0000000 millibar)
Answer:
20 bar = 20000.00000 millibar
How to Convert Bar to Millibar (Step-by-Step)
Converting bar to millibar (mbar) is essential in meteorology and aviation. Since "milli" means one-thousandth, the conversion is 1 bar = 1000 mbar exactly. Weather forecasts and altimeter settings use millibar (also called hectopascal, hPa).
- Write down the pressure value in bar.
- Multiply the bar value by 1000.
- The result is the pressure in millibar (mbar).
Common Bar to Millibar Conversions
Barometric pressures encountered in weather forecasting, aviation, and atmospheric science.
| Bar | Millibar |
|---|---|
| 0.870 bar | 870 mbar |
| 0.960 bar | 960 mbar |
| 0.990 bar | 990 mbar |
| 1.000 bar | 1000 mbar |
| 1.01325 bar | 1013.25 mbar |
| 1.030 bar | 1030 mbar |
| 1.050 bar | 1050 mbar |
| 1.084 bar | 1084 mbar |
Solved Examples: Bar to Millibar
Question 1: A weather station reports barometric pressure of 1.023 bar. Express in millibar for the forecast.
Solution:
Pressure in mbar = 1.023 × 1000
= 1023 mbar
Answer: 1.023 bar = 1023 mbar — a high-pressure system indicating fair weather.
Question 2: A hurricane center pressure drops to 0.945 bar. What is this in millibar?
Solution:
Pressure in mbar = 0.945 × 1000
= 945 mbar
Answer: 0.945 bar = 945 mbar — Category 4 hurricane intensity.
Question 3: An aircraft altimeter is set to 1.013 bar (QNH). Express as millibar for the ATIS readback.
Solution:
Pressure in mbar = 1.013 × 1000
= 1013 mbar
Answer: 1.013 bar = 1013 mbar (standard day QNH setting).
Question 4: At cruising altitude (35,000 ft), cabin pressure is maintained at approximately 0.75 bar. What is this in mbar?
Solution:
Pressure in mbar = 0.75 × 1000
= 750 mbar
Answer: 0.75 bar = 750 mbar — equivalent to about 8,000 ft altitude.
Practice Questions: Bar to Millibar
Try solving these on your own to test your understanding:
- Convert 1.005 bar to millibar. (Answer: 1005 mbar)
- An approaching storm drops pressure to 0.985 bar. Express in mbar. (Answer: 985 mbar)
- Convert 0.5 bar to millibar. (Answer: 500 mbar — mid-troposphere level)
- A vacuum pump achieves 0.001 bar. What is this in mbar? (Answer: 1 mbar)
- Convert 1.040 bar to millibar. (Answer: 1040 mbar — strong winter high)
Weather Forecasting and the Millibar
Meteorologists track barometric pressure changes in millibar to predict weather. A pressure drop of 1-2 mbar/hour signals approaching storms; drops exceeding 3 mbar/hour indicate severe weather (bomb cyclones drop 24+ mbar in 24 hours). Surface analysis maps show isobars — lines of equal pressure in mbar — spaced 4 mbar apart. High pressure (>1020 mbar) brings clear skies; low pressure (<1000 mbar) brings clouds and rain.
Aviation Altimetry: QNH and QFE in Millibar
Pilots set altimeters using pressure in millibar (or inches of mercury in the US). QNH is sea-level-corrected pressure — when set, the altimeter reads altitude above sea level. QFE is airfield pressure — altimeter reads zero on the ground. Standard pressure (1013 mbar) is used above the transition altitude. A 1 mbar error causes ~27 feet (8 m) altitude error — critical for instrument approaches in low visibility.
Millibar vs. Hectopascal: Are They the Same?
Yes — 1 mbar = 1 hPa exactly. The World Meteorological Organization (WMO) officially adopted hectopascal in 1986 to align with SI, but millibar remains common in practice. Canadian weather uses kPa (divide mbar by 10), the US uses inches of mercury (inHg), and most of the world uses hPa/mbar. The numbers are identical: "1013 hPa" and "1013 mbar" convey the same pressure.
Key Takeaways
- 1 bar = 1000 mbar exactly — just multiply by 1000.
- Standard atmospheric pressure = 1013.25 mbar.
- Millibar and hectopascal (hPa) are numerically identical.
- Weather: >1020 mbar = fair, <1000 mbar = stormy.
- Aviation altimeter error: 1 mbar ≈ 27 feet altitude discrepancy.
- Hurricane central pressures: 920-960 mbar (Categories 3-5).
Bar to Millibar Conversion Formula
millibar = bar × 1000.0000000
1 bar = 1000.0000000 millibar
1 millibar = 0.0010000 bar
Reverse: bar = millibar × 0.0010000
Frequently Asked Questions
How many millibar are in 1 bar?
There are 1000.0000000 millibar in 1 bar. To convert bar to millibar, multiply the value by 1000.0000000.
How do I convert bar to millibar?
Multiply your bar value by 1000.0000000 to get the equivalent in millibar. For example, 5 bar = 5 × 1000.0000000 = 5000.00000 millibar.
How do I convert millibar to bar?
Multiply your millibar value by 0.0010000 to get the equivalent in bar. Alternatively, divide by 1000.0000000.
What is 10 bar in millibar?
10 bar is equal to 10000.00000 millibar.
What is 100 bar in millibar?
100 bar is equal to 100000.00000 millibar.