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Inches of mercury to Hectopascals (inHg to hPa)
Convert inches of mercury to hectopascals: 1 inHg = 33.8639 hPa. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 inHg = 33.8639 hPa
hectopascals = inches of mercury × 33.8638864 — reverse: inches of mercury = hectopascals × 0.0295299833
The factor is derived from the SI definitions of both units (base unit: Pa) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 inHg = 169.319 hPa
- 12.5 inHg = 423.299 hPa
- 100 inHg = 3386.39 hPa
Inches of mercury to hectopascals conversion table
| Inches of mercury (inHg) | Hectopascals (hPa) |
|---|---|
| 1 | 33.8639 |
| 2 | 67.7278 |
| 3 | 101.592 |
| 4 | 135.456 |
| 5 | 169.319 |
| 6 | 203.183 |
| 7 | 237.047 |
| 8 | 270.911 |
| 9 | 304.775 |
| 10 | 338.639 |
| 15 | 507.958 |
| 20 | 677.278 |
| 25 | 846.597 |
| 30 | 1015.92 |
| 40 | 1354.56 |
| 50 | 1693.19 |
| 75 | 2539.79 |
| 100 | 3386.39 |
| 200 | 6772.78 |
| 250 | 8465.97 |
| 500 | 16931.9 |
| 1000 | 33863.9 |
FAQ
How many hectopascals are in one inch of mercury?
1 inHg = 33.8639 hPa. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert inches of mercury to hectopascals?
Multiply the value in inches of mercury by 33.8638864: hectopascals = inches of mercury × 33.8638864. For example, 5 inHg = 169.319 hPa.
How do I convert hectopascals back to inches of mercury?
Multiply by the inverse factor 0.0295299833 (inches of mercury = hectopascals × 0.0295299833), or use the hectopascals-to-inches of mercury page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=inHg&to_unit=hPa - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"inHg","to_unit":"hPa"} - Markdown: https://tttkmbb.com/conversion/inhg-to-hpa.md · JSON: https://tttkmbb.com/conversion/inhg-to-hpa.json (add
?value=for a result) · Units: /api/v1/units?quantity=pressure - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.