Standard atmosphere to Bar Converter
Enter the value that you want to convert Standard atmosphere (atm) to bar or bar to Standard atmosphere.
1 Standard atmosphere = 1.0132500 bar
Formula: bar = Standard atmosphere value × 1.0132500
Standard atmosphere to bar
10 Standard atmosphere = 10.13250 bar
Popular Pressure Converters:
How Standard atmosphere Relates to Bar
About the Standard atmosphere
Standard atmosphere (atm) is a unit of pressure measurement. 1 Standard atmosphere is equal to 1.0132500 bar.
The Bar in Engineering
Bar (bar) is a unit of pressure measurement. 1 bar is equal to 0.9869233 Standard atmosphere.
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.
Standard atmosphere to bar metric conversion table
| 0.01 atm | = | 0.01013 bar |
| 0.1 atm | = | 0.10132 bar |
| 1 atm | = | 1.01325 bar |
| 2 atm | = | 2.02650 bar |
| 3 atm | = | 3.03975 bar |
| 4 atm | = | 4.05300 bar |
| 5 atm | = | 5.06625 bar |
| 6 atm | = | 6.07950 bar |
| 7 atm | = | 7.09275 bar |
| 8 atm | = | 8.10600 bar |
| 9 atm | = | 9.11925 bar |
| 10 atm | = | 10.13250 bar |
| 11 atm | = | 11.14575 bar |
| 12 atm | = | 12.15900 bar |
| 13 atm | = | 13.17225 bar |
| 14 atm | = | 14.18550 bar |
| 15 atm | = | 15.19875 bar |
| 16 atm | = | 16.21200 bar |
| 17 atm | = | 17.22525 bar |
| 18 atm | = | 18.23850 bar |
| 19 atm | = | 19.25175 bar |
| 20 atm | = | 20.26500 bar |
| 30 atm | = | 30.39750 bar |
| 40 atm | = | 40.53000 bar |
| 50 atm | = | 50.66250 bar |
| 60 atm | = | 60.79500 bar |
| 70 atm | = | 70.92750 bar |
| 80 atm | = | 81.06000 bar |
| 90 atm | = | 91.19250 bar |
| 100 atm | = | 101.32500 bar |
| 200 atm | = | 202.65000 bar |
| 300 atm | = | 303.97500 bar |
| 400 atm | = | 405.30000 bar |
| 500 atm | = | 506.62500 bar |
| 600 atm | = | 607.95000 bar |
| 700 atm | = | 709.27500 bar |
| 800 atm | = | 810.60000 bar |
| 900 atm | = | 911.92500 bar |
| 1000 atm | = | 1013.25000 bar |
How to Convert Standard atmosphere to Bar?
We can convert Standard atmosphere to bar by using an example.
Example:
Convert 20 Standard atmosphere to Bar?
We know 1 Standard atmosphere = 1.0132500 bar; 1 Bar = 0.9869233 Standard atmosphere.
20 Standard atmosphere = ___bar
20 × 1.0132500 = 20.26500 bar (we know 1 Standard atmosphere = 1.0132500 bar)
Answer:
20 Standard atmosphere = 20.26500 bar
How to Convert Atmospheres to Bar (Step-by-Step)
Converting atmospheres to bar is common in diving equipment calibration and when transitioning between chemistry (atm) and industrial (bar) pressure scales. The conversion factor is 1 atm = 1.01325 bar.
- Write down the pressure value in atmospheres (atm).
- Multiply the atm value by 1.01325.
- The result is the equivalent pressure in bar.
- For quick estimation, atm ≈ bar (the difference is only 1.3%).
Common Atmosphere to Bar Conversions
Diving depths, gas pressures, and process values converted from atm to bar.
| Standard atmosphere | Bar |
|---|---|
| 1 atm | 1.01325 bar |
| 2 atm | 2.02650 bar |
| 3 atm | 3.03975 bar |
| 4 atm | 4.05300 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 200 atm | 202.650 bar |
Solved Examples: Atmospheres to Bar
Question 1: A dive plan calculates pressure at 40 m as 5 atm (absolute). Express in bar for the dive computer.
Solution:
Pressure in bar = Pressure in atm × 1.01325
= 5 × 1.01325
= 5.06625 bar
Answer: 5 atm = 5.066 bar — the dive computer will display approximately 5.1 bar absolute.
Question 2: A gas cylinder regulator is set for 150 atm. What does the bar gauge read?
Solution:
Pressure in bar = 150 × 1.01325
= 151.99 bar
Answer: 150 atm = 151.99 bar ≈ 152 bar.
Question 3: A hyperbaric oxygen chamber operates at 2.4 atm absolute. Express in bar.
Solution:
Pressure in bar = 2.4 × 1.01325
= 2.432 bar
Answer: 2.4 atm = 2.43 bar — standard treatment pressure for decompression illness.
Practice Questions: Atmospheres to Bar
Try solving these on your own to test your understanding:
- Convert 6 atm to bar. (Answer: 6.080 bar)
- A recompression chamber is pressurized to 6.0 atm. Express in bar. (Answer: 6.080 bar)
- Convert 0.5 atm to bar. (Answer: 0.507 bar)
- A tank is filled to 300 atm. What is this in bar? (Answer: 303.975 bar)
- Convert 1.5 atm to bar. (Answer: 1.520 bar)
Diving Pressure: Why atm and bar Are Nearly Interchangeable
In recreational diving, atm and bar are used almost interchangeably because 1 atm = 1.01325 bar — a difference of only 1.3%. Each 10 meters of seawater adds approximately 1 bar (actually 1.013 bar in saltwater). Dive computers display ambient pressure in bar, while decompression theory (Bühlmann model) uses atm. For recreational depths (<40 m), treating atm = bar introduces negligible error, but technical divers doing precise gas blending calculations use the exact 1.01325 factor.
Dive Computer Calibration and Gauge Readings
Modern dive computers display depth-derived pressure in bar (absolute) and tank pressure from the transmitter also in bar. The surface reads ~1.013 bar. At 30 m: ambient ≈ 4.05 bar. Nitrogen narcosis onset varies by individual but commonly around 3-4 bar (20-30 m). Understanding that these bar readings correspond closely to the same number of atm helps relate dive physics textbook values (usually in atm) to instrument readings (always in bar).
Key Takeaways
- Multiply atm by 1.01325 to get bar.
- For practical purposes: 1 atm ≈ 1 bar (only 1.3% difference).
- Each 10 m seawater depth adds ~1 bar (or ~1 atm) to ambient pressure.
- Dive computers display bar; decompression theory uses atm.
- A full SCUBA tank at 200 bar ≈ 197 atm.
- Hyperbaric medicine uses both units: 2.4 atm ≈ 2.43 bar treatment pressure.
Standard atmosphere to Bar Conversion Formula
bar = Standard atmosphere × 1.0132500
1 Standard atmosphere = 1.0132500 bar
1 bar = 0.9869233 Standard atmosphere
Reverse: Standard atmosphere = bar × 0.9869233
Frequently Asked Questions
How many bar are in 1 Standard atmosphere?
There are 1.0132500 bar in 1 Standard atmosphere. To convert Standard atmosphere to bar, multiply the value by 1.0132500.
How do I convert Standard atmosphere to bar?
Multiply your Standard atmosphere value by 1.0132500 to get the equivalent in bar. For example, 5 Standard atmosphere = 5 × 1.0132500 = 5.06625 bar.
How do I convert bar to Standard atmosphere?
Multiply your bar value by 0.9869233 to get the equivalent in Standard atmosphere. Alternatively, divide by 1.0132500.
What is 10 Standard atmosphere in bar?
10 Standard atmosphere is equal to 10.13250 bar.
What is 100 Standard atmosphere in bar?
100 Standard atmosphere is equal to 101.32500 bar.