{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"pressure"},"result":{"entity_type":"calculator","id":"pressure","calculator_id":"pressure","canonical_url":"https://tttkmbb.com/conversion/pressure","name":"Pressure Converter","title":"Pressure Converter – Pascal, Bar, atm, psi, mmHg, Torr and Inches of Mercury","category":"conversion","category_name":"Unit Conversion","tool_name":"convert_pressure","featured_mcp_tool":false,"description":"Converts pressure between pascals (Pa to MPa), bar/millibar, standard atmospheres, psi and ksi, millimetres and inches of mercury, torr and technical atmospheres (kgf/cm²) using NIST factors (1 psi = 6894.757293168 Pa, 1 atm = 101325 Pa).","use_when":"You need tyre, weather, hydraulic, vacuum or blood pressure in another unit, e.g. psi to bar, atm to kPa or mmHg to kPa.","do_not_use_when":"You need to compute pressure from force and area (a physics calculation, not a unit conversion) or the gas law relation between pressure, volume and temperature (use ideal-gas-law).","inputs":[{"name":"value","label":"Value","type":"number","required":true,"description":"Amount to convert, expressed in from_unit.","example":1},{"name":"from_unit","label":"From unit","type":"enum","required":true,"values":[{"value":"Pa","label":"Pascal (Pa)","aliases":["pascal","pascals","n/m²","n/m2","n/m^2"]},{"value":"hPa","label":"Hectopascal (hPa)","aliases":["hectopascal","hectopascals"]},{"value":"kPa","label":"Kilopascal (kPa)","aliases":["kilopascal","kilopascals"]},{"value":"MPa","label":"Megapascal (MPa)","aliases":["megapascal","megapascals"]},{"value":"bar","label":"Bar (bar)","aliases":["bars"]},{"value":"mbar","label":"Millibar (mbar)","aliases":["millibar","millibars","mb"]},{"value":"atm","label":"Standard atmosphere (atm)","aliases":["standard atmosphere","standard-atmosphere","standardatmosphere","standard·atmosphere","standard_atmosphere","atmosphere","atmospheres","standard atmospheres","standard-atmospheres","standardatmospheres","standard·atmospheres","standard_atmospheres"]},{"value":"psi","label":"Pound per square inch (psi)","aliases":["pound per square inch","pound-per-square-inch","poundpersquareinch","pound·per·square·inch","pound_per_square_inch","pounds per square inch","pounds-per-square-inch","poundspersquareinch","pounds·per·square·inch","pounds_per_square_inch","lbf/in²","lbf/in2","lbf/in^2","lb/in²","lb/in2","lb/in^2"]},{"value":"ksi","label":"Kip per square inch (ksi)","aliases":["kip per square inch","kip-per-square-inch","kippersquareinch","kip·per·square·inch","kip_per_square_inch","kips per square inch","kips-per-square-inch","kipspersquareinch","kips·per·square·inch","kips_per_square_inch"]},{"value":"mmHg","label":"Millimetre of mercury (mmHg)","aliases":["millimetre of mercury","millimetre-of-mercury","millimetreofmercury","millimetre·of·mercury","millimetre_of_mercury","millimeter of mercury","millimeter-of-mercury","millimeterofmercury","millimeter·of·mercury","millimeter_of_mercury","millimetres of mercury","millimetres-of-mercury","millimetresofmercury","millimetres·of·mercury","millimetres_of_mercury","millimeters of mercury","millimeters-of-mercury","millimetersofmercury","millimeters·of·mercury","millimeters_of_mercury","mm hg","mm-hg","mm·hg","mm_hg"]},{"value":"torr","label":"Torr (torr)","aliases":["torrs"]},{"value":"inHg","label":"Inch of mercury (inHg)","aliases":["inch of mercury","inch-of-mercury","inchofmercury","inch·of·mercury","inch_of_mercury","inches of mercury","inches-of-mercury","inchesofmercury","inches·of·mercury","inches_of_mercury","in hg","in-hg","in·hg","in_hg"]},{"value":"kgf/cm2","label":"Kilogram-force per square centimetre (kgf/cm²)","aliases":["kgf/cm^2","kgf/cm²","kilogram-force per square centimetre","kilogram-force-per-square-centimetre","kilogram force per square centimetre","kilogramforcepersquarecentimetre","kilogram·force·per·square·centimetre","kilogram_force_per_square_centimetre","technical atmosphere","technical-atmosphere","technicalatmosphere","technical·atmosphere","technical_atmosphere","kg/cm²","kg/cm2","kg/cm^2","at"]}],"description":"Unit of the input value. Accepted symbols: Pa, hPa, kPa, MPa, bar, mbar, atm, psi, ksi, mmHg, torr, inHg, kgf/cm2; spelled-out names and common abbreviations are accepted too.","example":"atm"},{"name":"to_unit","label":"To unit","type":"enum","required":true,"values":[{"value":"Pa","label":"Pascal (Pa)","aliases":["pascal","pascals","n/m²","n/m2","n/m^2"]},{"value":"hPa","label":"Hectopascal (hPa)","aliases":["hectopascal","hectopascals"]},{"value":"kPa","label":"Kilopascal (kPa)","aliases":["kilopascal","kilopascals"]},{"value":"MPa","label":"Megapascal (MPa)","aliases":["megapascal","megapascals"]},{"value":"bar","label":"Bar (bar)","aliases":["bars"]},{"value":"mbar","label":"Millibar (mbar)","aliases":["millibar","millibars","mb"]},{"value":"atm","label":"Standard atmosphere (atm)","aliases":["standard atmosphere","standard-atmosphere","standardatmosphere","standard·atmosphere","standard_atmosphere","atmosphere","atmospheres","standard atmospheres","standard-atmospheres","standardatmospheres","standard·atmospheres","standard_atmospheres"]},{"value":"psi","label":"Pound per square inch (psi)","aliases":["pound per square inch","pound-per-square-inch","poundpersquareinch","pound·per·square·inch","pound_per_square_inch","pounds per square inch","pounds-per-square-inch","poundspersquareinch","pounds·per·square·inch","pounds_per_square_inch","lbf/in²","lbf/in2","lbf/in^2","lb/in²","lb/in2","lb/in^2"]},{"value":"ksi","label":"Kip per square inch (ksi)","aliases":["kip per square inch","kip-per-square-inch","kippersquareinch","kip·per·square·inch","kip_per_square_inch","kips per square inch","kips-per-square-inch","kipspersquareinch","kips·per·square·inch","kips_per_square_inch"]},{"value":"mmHg","label":"Millimetre of mercury (mmHg)","aliases":["millimetre of mercury","millimetre-of-mercury","millimetreofmercury","millimetre·of·mercury","millimetre_of_mercury","millimeter of mercury","millimeter-of-mercury","millimeterofmercury","millimeter·of·mercury","millimeter_of_mercury","millimetres of mercury","millimetres-of-mercury","millimetresofmercury","millimetres·of·mercury","millimetres_of_mercury","millimeters of mercury","millimeters-of-mercury","millimetersofmercury","millimeters·of·mercury","millimeters_of_mercury","mm hg","mm-hg","mm·hg","mm_hg"]},{"value":"torr","label":"Torr (torr)","aliases":["torrs"]},{"value":"inHg","label":"Inch of mercury (inHg)","aliases":["inch of mercury","inch-of-mercury","inchofmercury","inch·of·mercury","inch_of_mercury","inches of mercury","inches-of-mercury","inchesofmercury","inches·of·mercury","inches_of_mercury","in hg","in-hg","in·hg","in_hg"]},{"value":"kgf/cm2","label":"Kilogram-force per square centimetre (kgf/cm²)","aliases":["kgf/cm^2","kgf/cm²","kilogram-force per square centimetre","kilogram-force-per-square-centimetre","kilogram force per square centimetre","kilogramforcepersquarecentimetre","kilogram·force·per·square·centimetre","kilogram_force_per_square_centimetre","technical atmosphere","technical-atmosphere","technicalatmosphere","technical·atmosphere","technical_atmosphere","kg/cm²","kg/cm2","kg/cm^2","at"]}],"description":"Unit to convert into (same symbols as from_unit).","example":"psi"}],"outputs":[{"name":"result","label":"Result","type":"number","decimals":6,"description":"Converted value expressed in to_unit (rounded to 6 decimals; see result_text for very small or very large values)."},{"name":"result_text","label":"Conversion","type":"string","decimals":4,"description":"The conversion as text with 6 significant figures, e.g. \"5 mi = 8.04672 km\"."},{"name":"formula","label":"Unit relation","type":"string","decimals":4,"description":"Relation used, e.g. \"1 mi = 1.609344 km\"."},{"name":"factor","label":"Factor","type":"number","decimals":12,"description":"Multiplier from from_unit to to_unit (result = value × factor); absent for non-linear conversions."},{"name":"conversion_table","label":"Conversion table","type":"object","decimals":12,"description":"The input value expressed in every supported pressure unit (6 significant figures), keyed by unit symbol."}],"input_schema":{"type":"object","properties":{"value":{"description":"Amount to convert, expressed in from_unit.","type":"number","examples":[1]},"from_unit":{"description":"Unit of the input value. Accepted symbols: Pa, hPa, kPa, MPa, bar, mbar, atm, psi, ksi, mmHg, torr, inHg, kgf/cm2; spelled-out names and common abbreviations are accepted too.","type":"string","enum":["Pa","hPa","kPa","MPa","bar","mbar","atm","psi","ksi","mmHg","torr","inHg","kgf/cm2"],"examples":["atm"]},"to_unit":{"description":"Unit to convert into (same symbols as from_unit).","type":"string","enum":["Pa","hPa","kPa","MPa","bar","mbar","atm","psi","ksi","mmHg","torr","inHg","kgf/cm2"],"examples":["psi"]}},"additionalProperties":false,"required":["value","from_unit","to_unit"]},"output_schema":{"type":"object","properties":{"result":{"description":"Converted value expressed in to_unit (rounded to 6 decimals; see result_text for very small or very large values).","type":"number"},"result_text":{"description":"The conversion as text with 6 significant figures, e.g. \"5 mi = 8.04672 km\".","type":"string"},"formula":{"description":"Relation used, e.g. \"1 mi = 1.609344 km\".","type":"string"},"factor":{"description":"Multiplier from from_unit to to_unit (result = value × factor); absent for non-linear conversions.","type":"number"},"conversion_table":{"description":"The input value expressed in every supported pressure unit (6 significant figures), keyed by unit symbol.","type":"object"}}},"formula":"result = value × factor, factor = (1 from_unit in Pa) / (1 to_unit in Pa)","method":"mmHg uses the conventional value 133.322387415 Pa (mercury density 13.5951 g/cm³ at 0 °C); torr is defined as exactly 1/760 atm, so 1 mmHg ≈ 1.000000142 torr. inHg = 25.4 mmHg.","sources":[{"name":"NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors","url":"https://www.nist.gov/pml/special-publication-811","type":"standard","retrieved_at":"2026-09-23"},{"name":"BIPM – The International System of Units (SI Brochure, 9th edition)","url":"https://www.bipm.org/en/publications/si-brochure","type":"standard","retrieved_at":"2026-09-23"},{"name":"Wikipedia – Conversion of units","url":"https://en.wikipedia.org/wiki/Conversion_of_units","type":"reference","retrieved_at":"2026-09-23"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"1 atm to psi","inputs":{"value":1,"from_unit":"atm","to_unit":"psi"},"expected":{"result":14.695949,"formula":"1 atm = 14.69594878 psi","conversion_table":{"bar":1.01325,"mmHg":760,"kPa":101.325,"torr":760}},"url":"https://tttkmbb.com/api/v1/calculate/pressure?value=1&from_unit=atm&to_unit=psi"},{"name":"32 psi to bar","inputs":{"value":32,"from_unit":"psi","to_unit":"bar"},"expected":{"result":2.206322,"conversion_table":{"kPa":220.632,"atm":2.17747}},"url":"https://tttkmbb.com/api/v1/calculate/pressure?value=32&from_unit=psi&to_unit=bar"}],"faq":[{"q":"Is bar the same as atmosphere?","a":"No. 1 bar = 100,000 Pa exactly; 1 atm = 101,325 Pa = 1.01325 bar = 14.6959 psi."},{"q":"Gauge or absolute pressure?","a":"The converter changes units only. Tyre gauges read pressure above atmospheric (psig); add 1 atm (14.6959 psi) for absolute pressure."}],"tags":["pressure converter","psi to bar","atm to kpa","mmhg to kpa","pascal to psi","torr"],"related":[{"calculator_id":"force","reason":"Convert the force units behind psi and kgf/cm²."},{"calculator_id":"ideal-gas-law","reason":"Pressure–volume–temperature of a gas."},{"calculator_id":"density","reason":"Hydrostatic pressure needs fluid density."}],"links":{"html":"https://tttkmbb.com/conversion/pressure","markdown":"https://tttkmbb.com/conversion/pressure.md","json":"https://tttkmbb.com/conversion/pressure.json","api":"https://tttkmbb.com/api/v1/calculate/pressure","schema":"https://tttkmbb.com/api/v1/calculators/pressure","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-23"},"timestamp":"2026-09-23T23:25:00Z","next_actions":[{"tool":"run_calculator","calculator_id":"pressure","reason":"Run Pressure Converter with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/conversion/pressure.md"}}