1013 hPa is approximately equal to 29.91 inHg.
The conversion from hectopascals (hPa) to inches of mercury (inHg) involves multiplying by a specific factor that relates these pressure units. Since 1 hPa equals about 0.02953 inHg, multiplying 1013 by this factor gives the equivalent pressure in inHg.
Conversion Tool
Result in inhg:
Conversion Formula
The formula converts hPa to inHg by multiplying the hPa value by 0.02953. This conversion factor comes from the relation between the pascal (Pa) and inHg. Since 1 hPa equals 100 Pa, and 1 inHg equals 3386.39 Pa, the formula is:
inHg = hPa × (100 Pa / 3386.39 Pa)
Breaking it down:
- 1 hPa = 100 Pa
- 1 inHg = 3386.39 Pa
- So, 1 hPa = 100 / 3386.39 inHg ≈ 0.02953 inHg
Example:
Convert 1013 hPa to inHg:
- 1013 × 0.02953 = 29.90689 inHg
- Rounded to 2 decimal places: 29.91 inHg
Conversion Example
- Convert 1000 hPa to inHg:
• Multiply 1000 × 0.02953 = 29.53 inHg
• So, 1000 hPa equals 29.53 inHg. - Convert 1020 hPa to inHg:
• Multiply 1020 × 0.02953 = 30.11 inHg
• Result: 30.11 inHg. - Convert 995 hPa to inHg:
• Multiply 995 × 0.02953 = 29.38 inHg
• Therefore, 995 hPa is 29.38 inHg. - Convert 1015 hPa to inHg:
• Multiply 1015 × 0.02953 = 29.95 inHg
• The converted value is 29.95 inHg. - Convert 980 hPa to inHg:
• Multiply 980 × 0.02953 = 28.93 inHg
• Result: 28.93 inHg.
Conversion Chart
| hPa | inHg |
|---|---|
| 988.0 | 29.16 |
| 993.0 | 29.31 |
| 998.0 | 29.46 |
| 1003.0 | 29.61 |
| 1008.0 | 29.75 |
| 1013.0 | 29.91 |
| 1018.0 | 30.06 |
| 1023.0 | 30.21 |
| 1028.0 | 30.36 |
| 1033.0 | 30.51 |
| 1038.0 | 30.66 |
This chart shows the pressure in hPa and the corresponding value in inHg. To use it, find the hPa value closest to your measurement, then look right to see the inHg equivalent. The values are rounded to two decimals for easier reading.
Related Conversion Questions
- How many inHg are in 1013 hPa?
- What is the formula to convert 1013 hPa to inHg?
- Is 1013 hPa equal to 29.91 inHg?
- What pressure in inHg corresponds to 1013 hPa?
- How to convert 1013 hectopascals into inches of mercury?
- Can 1013 hPa be converted directly to inHg without calculator?
- Why does 1013 hPa equal about 29.91 inHg in weather reports?
Conversion Definitions
hPa: Hectopascal is a unit of pressure commonly used in meteorology, equal to 100 pascals. It measures atmospheric pressure and is derived from the SI unit pascal, which quantifies force per square meter. The hPa scale is convenient for reporting weather conditions like barometric pressure.
inHg: Inches of mercury is a pressure unit based on the height of mercury column in a barometer. It measures pressure by how high mercury rises in a tube, with one inch of mercury equal to 3386.39 pascals. This unit is often used in aviation and weather forecasting in the United States.
Conversion FAQs
Why does 1013 hPa equal about 29.91 inHg?
The equivalence comes from the physical relationship between pascals and inHg. Since 1 inHg equals 3386.39 pascals and 1 hPa equals 100 pascals, multiplying 1013 hPa by 0.02953 (100/3386.39) gives roughly 29.91 inHg. This conversion is standard for atmospheric pressure measurements.
Can I use a rough estimate instead of exact formula for hPa to inHg?
You can approximate by multiplying hPa by 0.03, but this will give a small error. The factor 0.02953 is more precise, so for scientific or aviation use, use the exact formula. For casual purposes, the rough estimate is fine but less accurate.
Is the conversion affected by temperature or altitude?
The conversion between hPa and inHg is a fixed mathematical relation and does not change with temperature or altitude. However, atmospheric pressure itself varies with altitude and temperature, so readings in hPa or inHg change depending on environmental conditions.
Why do some weather stations use hPa and others inHg?
Different countries and industries prefer different units. Many countries use hPa as part of the metric system, while the United States often uses inHg due to historical reasons. Both measure pressure, but users must convert values for comparison or analysis.
How precise is the inHg value after conversion from hPa?
The precision depends on the decimal places used. The conversion factor is exact to five decimals, but practical pressure measurements usually round to two or three decimals, as atmospheric pressure fluctuates. So, converted values are accurate enough for most applications.