Inches of Mercury to Pounds per Square Inch Converter
Convert Inches of Mercury to Pounds per Square Inch with the exact conversion factor, a worked example and a quick-reference table. Runs entirely in your browser.
This converter turns Inches of Mercury into Pounds per Square Inch instantly using the standard definition of both units. It includes the formula, a worked example, and a quick table for common amounts, and it works for any value you type — including decimals and negatives where they make sense.
Quick reference — Inches of Mercury to Pounds per Square Inch
How to use this calculator
- Enter the value in Inches of Mercury in the input box.
- Read the result in Pounds per Square Inch — it updates as you type.
- Use the Swap button to convert in the opposite direction.
- Check the quick-reference table for common Inches of Mercury amounts.
The formula
Pounds per Square Inch = Inches of Mercury × 0.491154
Worked example
30 inHg = 14.7346 psi — in full, 30 Inches of Mercury converts to 14.7346 Pounds per Square Inch. Tyre pressure, weather maps and diving are the everyday jobs for this conversion.
Frequently Asked Questions
How do I convert Inches of Mercury to Pounds per Square Inch?
Multiply the value in Inches of Mercury by 0.491154. For example, 30 Inches of Mercury × 0.491154 = 14.7346 Pounds per Square Inch. To go the other way, divide by 0.491154 instead — or press Swap in the converter above.
How many Pounds per Square Inch are in one Inch of Mercury?
One Inch of Mercury equals 0.491154 Pounds per Square Inch. Scaling up, 10 Inches of Mercury = 4.91154 Pounds per Square Inch and 100 Inches of Mercury = 49.1154 Pounds per Square Inch. The converter uses the full-precision factor, so typed values are more precise than the rounded figure quoted here.
Which is bigger, a Inch of Mercury or a Pound per Square Inch?
A Pound per Square Inch is bigger. One Pound per Square Inch equals 2.03602 Inches of Mercury, while one Inch of Mercury is only 0.491154 Pounds per Square Inch. So a measurement that looks smaller in Pounds per Square Inch is reflecting the scale difference, not an error.
What is 30 Inches of Mercury in Pounds per Square Inch?
30 Inches of Mercury is 14.7346 Pounds per Square Inch. The math is 30 × 0.491154 = 14.7346. Try any other amount in the converter above and the result updates as you type.