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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.

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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.

15 of 15 calculators

Temperature & pressure15 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

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 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

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

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

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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Related comparisons

All Conversion comparisons →
Celsius vs Kelvin Temperature ConverterCompare the Celsius-to-Kelvin conversion with the Kelvin-to-Fahrenheit converter: the offset-only step into an absolute scale versus the full interval-and-offset bridge to Fahrenheit.Density vs Viscosity CalculatorCompare density, mass per volume converted among kg/m³, g/cm³, and lb/ft³, with viscosity, a fluid's resistance to flow converted among pascal-second, poise, centipoise, and millipascal-second.kPa to atm vs psi to atm ConversionCompare the kPa to atm and psi to atm converters: the same standard-atmosphere destination with different source units — SI kilopascals versus US customary psi.kPa to psi vs MPa to psi ConversionCompare the kPa to psi and MPa to psi converters: same US customary target, different SI source unit — kilopascals for tires, compressors, and weather versus megapascals for material strength and engineering stress.mmHg to atm vs Torr to atm ConversionCompare the mmHg to atm and Torr to atm conversions: one uses the conventional mercury-column factor, the other the exact 760-per-atmosphere definition — and when the near-equality matters.Pressure Converter vs Barometric PressureCompare the pressure converter's general Pa, kPa, bar, atm, psi, and mmHg hub with the barometric pressure conversion's weather-focused hPa, mbar, inHg, and full-precision mercury factors.

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