APIs › Petroleum Engineering Calculators › Pressure Converter

Pressure Converter

Converts among psi, bar, kPa, MPa, atm, kg/cm², inH₂O and mmHg, and between gauge and absolute with a stated atmospheric reference.

POST /v1/petroleum/pressure-convert $0.005 per call

Specification

Endpoint

POST /v1/petroleum/pressure-convert

Price

$0.005 per call · tier basic_data

Payment

x402 on X Layer (chain 196) · settled in USDG or USDT0 · schemes exact, aggr_deferred

Data source

Published petroleum-engineering correlations, cited per endpoint

Timeout

15 seconds

Max request

64 KB

Version

1.0.0

Calling it

The first call returns a 402 with the payment challenge. Retry with a signed authorisation in the X-PAYMENT header — see the payment guide for the exact shape.

curl -i -X POST "https://api.dana-edu.pp.ua/v1/petroleum/pressure-convert" \
  -H "content-type: application/json" \
  -d '{ ... }'

Response

Real output, captured by running this endpoint at build time — not written by hand. Volatile fields such as timestamps are elided. Captured 2026-07-30.

{
  "input": {
    "value": 3500,
    "unit": "psi"
  },
  "output": {
    "value": 241.316505,
    "unit": "bar"
  },
  "value_in_pa": 24131650.5261,
  "all_units": {
    "pa": 24131650.526088,
    "kpa": 24131.650526,
    "mpa": 24.131651,
    "bar": 241.316505,
    "psi": 3500,
    "atm": 238.160874,
    "kg_cm2": 246.074353,
    "inh2o": 96879.670375,
    "mmhg": 181002.238214
  },
  "gauge_absolute_conversion": "none",
  "atmospheric_reference_kpa": 101.325,
  "note": "Conversions use exact SI-defined factors. 1 psi = 6894.757293168 Pa exactly; 1 atm = 101325 Pa exactly."
}

Every response is wrapped in the same envelope: data plus warnings, sources, confidence, informational_only and a measured processing_ms. See the envelope reference.

Related endpoints