Check the current barometric pressure where you are, whether it is rising, falling or steady over the last 3 hours, and how it has changed over the past 48 hours, with the next 24 hours of forecast. Switch between inHg, hPa (millibars), mmHg and kPa, and between sea-level and actual station pressure.
Last updated:
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Loading pressure data…
Pressure now (sea level)
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3-hour trend
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24 h change–
48 h high–
48 h low–
Next 12 h–
Past 48 hours and next 24 hours
Measured / analysed Forecast Now
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How to use the Barometric Pressure Today
Choose a place: the last place you used (or New York) loads automatically. Search a city or postcode, type lat, lon, or press Use my location.
Read the current pressure: the big number is the pressure now, with the same value in the other units and a low, normal or high label.
Check the trend: the arrow card shows whether pressure is rising, falling or steady over the last 3 hours and by how much.
Explore the chart: hover or tap the chart (or use the arrow keys) to read any hour; the dashed part is the forecast.
Switch units or type: pick inHg, hPa, mmHg or kPa, and Sea level or Station (actual) pressure. Your choice is remembered.
Reading the pressure trend
A single pressure reading tells you less than the direction it is moving. Meteorologists describe the pressure tendency as the change over the last 3 hours, and this tool uses the same wording as the UK Met Office shipping forecasts:
3-hour change
In inHg
Described as
What it often means
less than 0.1 hPa
< 0.003
Steady
Little change in the weather for now
0.1 to 1.5 hPa
0.003 to 0.044
Rising / falling slowly
Gradual change over a day or more
1.6 to 3.5 hPa
0.047 to 0.103
Rising / falling
A front or pressure system moving through
3.6 to 6.0 hPa
0.106 to 0.177
Rising / falling quickly
Windy, changeable weather is likely
more than 6.0 hPa
> 0.177
Rising / falling very rapidly
Possible gales or a strong storm nearby
Pressure levels and unit conversions
hPa (mb)
inHg
mmHg
Typical situation (sea level)
1050
31.01
787.6
Very strong winter high, cold and clear
1030
30.42
772.6
High pressure, settled and dry
1013.25
29.92
760.0
Standard atmosphere average
1000
29.53
750.1
Low pressure, unsettled, rain likely
980
28.94
735.1
Deep low, stormy and windy
950
28.05
712.6
Severe storm or hurricane centre
Conversions: inHg = hPa ÷ 33.8639; mmHg = hPa × 0.750062; kPa = hPa ÷ 10; 1 hPa = 1 millibar. Station pressure falls with height: at 1,600 m (Denver, about 5,280 ft) normal station pressure is only about 835 hPa (24.7 inHg), while the sea-level value reported on the news is still near 1013 hPa.
Tips
Setting a home barometer: use the sea-level value shown here for your town and adjust the barometer's reference needle or calibration screw to match.
Pressure and headaches or joint pain: many people track rapid falls. Watch the 3-hour trend card and the chart's steep sections rather than the absolute number.
Fishing and outdoor plans: anglers often prefer steady or slowly falling pressure ahead of a front; a rapid fall is a cue to check the official forecast for storms.
Frequently asked questions
What is a normal barometric pressure?
Standard sea-level pressure is 1013.25 hPa, which equals 29.92 inHg or 760 mmHg. Day-to-day readings usually stay between about 980 and 1040 hPa (28.9 to 30.7 inHg). Readings above roughly 1020 hPa (30.12 inHg) are considered high pressure, and below about 1005 hPa (29.68 inHg) low pressure.
How do I know if barometric pressure is rising or falling?
The tool compares the pressure now with the value 3 hours ago, the standard period used by weather services. Using the UK Met Office scale, a change under 0.1 hPa is steady, 0.1 to 1.5 hPa is slowly, 1.6 to 3.5 hPa is rising or falling, 3.6 to 6 hPa is quickly and more than 6 hPa is very rapidly.
What is the difference between sea-level and station pressure?
Station pressure is the actual weight of the air above the ground where you are, so it drops by roughly 12 hPa for every 100 m (about 1 inHg per 1,000 ft) of elevation. Sea-level pressure adjusts that reading to what it would be at sea level, which lets places at different heights be compared. Weather reports, maps and home barometers set to local conditions use sea-level pressure.
What does falling barometric pressure mean for the weather?
Falling pressure usually means a low-pressure system or front is approaching, which often brings clouds, rain and wind. A fast fall of several hPa in 3 hours can come before a storm. Rising pressure generally signals clearing, drier weather. These are rules of thumb: always check an official forecast for important plans.
Where does the pressure data come from?
Values come from the free Open-Meteo weather API, which combines national weather service models (such as NOAA GFS and HRRR in the US and ECMWF and DWD models elsewhere) for the nearest model grid point. Past hours are model analyses rather than readings from a specific weather station, so they can differ from a nearby airport report by about 1 hPa.
How do I convert hPa to inHg?
Divide hectopascals by 33.8639 to get inches of mercury, or multiply inHg by 33.8639 to get hPa. For example, 1013.25 hPa ÷ 33.8639 = 29.92 inHg. One hectopascal is exactly one millibar, 1 kPa is 10 hPa, and 1 mmHg is about 1.3332 hPa.
Is my location stored or shared?
Your chosen place is saved only in your browser so the page opens on it next time. To fetch the data, the page sends just the latitude and longitude (rounded to 4 decimals) to the Open-Meteo API; place names you search are sent to Open-Meteo's geocoding service. Nothing else about you is sent.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.