Conversion tool map
Temperature & pressure
Temperature scales and pressure units.
Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.
Latest update:
These tools translate temperature scales and pressure units between the languages different fields use. Start with the temperature converter for Celsius, Fahrenheit, and Kelvin, whether the reading comes from a forecast, an oven, or a lab note. For absolute-scale values, the kelvin converter reads a Kelvin source into Celsius, Fahrenheit, and Rankine. Pressure needs its own hub: the pressure converter handles pascals, kilopascals, bar, atmospheres, psi, and millimeters of mercury across tire gauges, weather reports, chemistry, and vacuum work. Pick the hub that matches the quantity you hold. See the rest of the family in the Conversion collection.
25 of 25 calculators
Temperature & pressure25 calculators
Bar to PSIG Converter
Convert absolute bar or gauge bar to PSIG with the atmospheric offset, formulas, worked examples, and tire, compressor, and vacuum-pressure cautions.
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Verified
Barometric Pressure Conversion
Convert barometric pressure readings among hPa, millibars, inHg, mmHg, kPa, Pa, bar, atm, and psi for weather, aviation, and lab records.
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Verified
Kelvin Converter
Convert Kelvin to Celsius, Fahrenheit, and Rankine with absolute-temperature formulas, science references, history, and offset pitfalls.
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Verified
Kelvin to Fahrenheit Converter
Convert Kelvin to Fahrenheit and Fahrenheit to Kelvin for physics and engineering with exact offset formulas, examples, and absolute-zero checks.
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Verified
kg/cm² to psi Converter
Convert kgf/cm² to psi and psi to kgf/cm² for tire, hydraulic, pump, and industrial pressure readings with a standards-derived factor.
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Verified
kPa Converter
Convert kilopascals to psi, bar, atm, mmHg, and pascals with reference tables, formulas, and pressure-context guidance for gauges, weather, HVAC, and lab work.
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Verified
kPa to atm Conversion
Convert kilopascals to standard atmospheres, or atmospheres back to kPa, using 101.325 kPa per atm for lab, weather, and equipment references.
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Verified
kPa to mmHg Conversion
Convert kPa to mmHg and mmHg to kPa for blood pressure, weather, vacuum, and laboratory pressure references using the calculator's displayed factors.
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Verified
kPa to psi Conversion
Convert kPa to psi or psi to kPa with tire, compressor, weather, and engineering guidance that distinguishes gauge and absolute pressure.
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Verified
KSI to MPa Converter
Convert ksi to MPa and MPa to ksi for material strength, tensile stress, yield stress, and high-pressure engineering specifications.
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Verified
KSI to PSI Conversion
Convert KSI to PSI and PSI to KSI for material stress, tensile strength, yield strength, and high-pressure engineering values.
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Verified
MmHg to Atm Conversion
Convert conventional millimeters of mercury at 0 °C to standard atmospheres, or atm back to mmHg, with the stated reference basis.
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Verified
MPa Conversion
Convert megapascals to psi, bar, atm, kPa, and pascals with engineering formulas, material-strength examples, reference tables, and pressure-versus-stress guidance.
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Verified
MPa to PSI Conversion
Convert MPa to psi or psi to MPa with engineering formulas, material-strength examples, reference tables, and precision notes for pressure and stress values.
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Verified
MPa to psig Conversion
Convert absolute megapascals to psig by first converting MPa to psia and then subtracting standard atmospheric pressure for a gauge reading.
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Verified
Pa to psi Converter
Convert pascals to pounds per square inch from the pound-force and exact-inch relationships, plus kPa, bar, and atm context.
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Verified
Pascal Conversion
Convert pascals into kPa, MPa, bar, atm, psi, and mmHg with SI definitions, engineering examples, weather context, and pressure pitfalls.
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Verified
Pressure Converter Calculator
Convert Pa, kPa, bar, atm, psi, and mmHg in one pressure hub with formulas, reference factors, and gauge-versus-absolute guidance.
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Verified
PSI Converter
Convert psi into kPa, bar, atm, MPa, mmHg, and Pa with tire, plumbing, compressor, vacuum, and engineering pressure guidance.
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Verified
psi to atm Conversion
Convert psi to standard atmospheres or atm to psi with formulas, gas-law examples, gauge-pressure cautions, and reference tables using 14.69595 psi per atm.
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Verified
psi to Inches of Water Conversion
Convert psi to inches of water column and back for low-pressure HVAC, gas appliance, fan, filter, and manometer readings.
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Verified
PSIG to PSIA Converter
Convert gauge pressure to absolute pressure, or PSIA back to PSIG, using the calculator's 14.6959 psi standard-atmosphere offset.
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Verified
Temperature Converter
Convert among Celsius, Fahrenheit, and Kelvin with absolute-zero validation, offset-aware formulas, scale history, reference tables, and worked examples.
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Verified
Torr to atm Conversion
Convert Torr to atmospheres or atm to Torr with vacuum-focused formulas, mmHg context, worked examples, reference tables, and pressure precision notes.
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Verified
Viscosity Converter Calculator
Convert dynamic viscosity among pascal-second, poise, centipoise, and millipascal-second with exact factors, formulas, examples, temperature context, and unit pitfalls.
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Verified
Bar to PSIG Converter
Convert absolute bar or gauge bar to PSIG with the atmospheric offset, formulas, worked examples, and tire, compressor, and vacuum-pressure cautions.
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Verified
Barometric Pressure Conversion
Convert barometric pressure readings among hPa, millibars, inHg, mmHg, kPa, Pa, bar, atm, and psi for weather, aviation, and lab records.
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Verified
Kelvin Converter
Convert Kelvin to Celsius, Fahrenheit, and Rankine with absolute-temperature formulas, science references, history, and offset pitfalls.
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Verified
Kelvin to Fahrenheit Converter
Convert Kelvin to Fahrenheit and Fahrenheit to Kelvin for physics and engineering with exact offset formulas, examples, and absolute-zero checks.
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Verified
kg/cm² to psi Converter
Convert kgf/cm² to psi and psi to kgf/cm² for tire, hydraulic, pump, and industrial pressure readings with a standards-derived factor.
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Verified
kPa Converter
Convert kilopascals to psi, bar, atm, mmHg, and pascals with reference tables, formulas, and pressure-context guidance for gauges, weather, HVAC, and lab work.
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Verified
kPa to atm Conversion
Convert kilopascals to standard atmospheres, or atmospheres back to kPa, using 101.325 kPa per atm for lab, weather, and equipment references.
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Verified
kPa to mmHg Conversion
Convert kPa to mmHg and mmHg to kPa for blood pressure, weather, vacuum, and laboratory pressure references using the calculator's displayed factors.
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Verified
kPa to psi Conversion
Convert kPa to psi or psi to kPa with tire, compressor, weather, and engineering guidance that distinguishes gauge and absolute pressure.
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Verified
KSI to MPa Converter
Convert ksi to MPa and MPa to ksi for material strength, tensile stress, yield stress, and high-pressure engineering specifications.
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Verified
KSI to PSI Conversion
Convert KSI to PSI and PSI to KSI for material stress, tensile strength, yield strength, and high-pressure engineering values.
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Verified
MmHg to Atm Conversion
Convert conventional millimeters of mercury at 0 °C to standard atmospheres, or atm back to mmHg, with the stated reference basis.
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Verified
MPa Conversion
Convert megapascals to psi, bar, atm, kPa, and pascals with engineering formulas, material-strength examples, reference tables, and pressure-versus-stress guidance.
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Verified
MPa to PSI Conversion
Convert MPa to psi or psi to MPa with engineering formulas, material-strength examples, reference tables, and precision notes for pressure and stress values.
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Verified
MPa to psig Conversion
Convert absolute megapascals to psig by first converting MPa to psia and then subtracting standard atmospheric pressure for a gauge reading.
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Verified
Pa to psi Converter
Convert pascals to pounds per square inch from the pound-force and exact-inch relationships, plus kPa, bar, and atm context.
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Verified
Pascal Conversion
Convert pascals into kPa, MPa, bar, atm, psi, and mmHg with SI definitions, engineering examples, weather context, and pressure pitfalls.
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Verified
Pressure Converter Calculator
Convert Pa, kPa, bar, atm, psi, and mmHg in one pressure hub with formulas, reference factors, and gauge-versus-absolute guidance.
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Verified
PSI Converter
Convert psi into kPa, bar, atm, MPa, mmHg, and Pa with tire, plumbing, compressor, vacuum, and engineering pressure guidance.
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Verified
psi to atm Conversion
Convert psi to standard atmospheres or atm to psi with formulas, gas-law examples, gauge-pressure cautions, and reference tables using 14.69595 psi per atm.
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Verified
psi to Inches of Water Conversion
Convert psi to inches of water column and back for low-pressure HVAC, gas appliance, fan, filter, and manometer readings.
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Verified
PSIG to PSIA Converter
Convert gauge pressure to absolute pressure, or PSIA back to PSIG, using the calculator's 14.6959 psi standard-atmosphere offset.
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Verified
Temperature Converter
Convert among Celsius, Fahrenheit, and Kelvin with absolute-zero validation, offset-aware formulas, scale history, reference tables, and worked examples.
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Verified
Torr to atm Conversion
Convert Torr to atmospheres or atm to Torr with vacuum-focused formulas, mmHg context, worked examples, reference tables, and pressure precision notes.
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Verified
Viscosity Converter Calculator
Convert dynamic viscosity among pascal-second, poise, centipoise, and millipascal-second with exact factors, formulas, examples, temperature context, and unit pitfalls.
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Verified
Frequently asked questions
- Which temperature scales can Kelvin be converted to?
- A Kelvin temperature can be converted to Celsius, Fahrenheit, and Rankine. Celsius and Fahrenheit make the value easier to read, while Rankine keeps an absolute scale with Fahrenheit-sized intervals.
- Why can Kelvin not be negative?
- Kelvin starts at absolute zero, so ordinary thermodynamic temperatures begin at 0 K. The calculator rejects negative Kelvin inputs because they would fall below the lower limit used by these conversion formulas.
- How do I convert Kelvin to Celsius?
- Subtract 273.15 from the Kelvin value. Kelvin and Celsius have equal interval sizes, so the conversion is an offset rather than a scaling factor.
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