Conversion method
Heat capacity per unit mass. Specify the material and conditions separately; this converter changes units only. Calories are thermochemical; BTU is International Table.
kJ/(kg·K) = x × 0.001
10 J/(kg·K) = 0.01 kJ/(kg·K).
| J/(kg·K) | kJ/(kg·K) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
Unit definitions and sources
Heat capacity per unit mass. Specify the material and conditions separately; this converter changes units only. Calories are thermochemical; BTU is International Table.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Joule per kilogram kelvin (J/(kg·K)); si | Common units | Joule per kilogram kelvin: base (j-kg-k) = value × 1. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilojoule per kilogram kelvin (kJ/(kg·K)); si | Common units | Kilojoule per kilogram kelvin: base (j-kg-k) = value × 1000. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Joule per gram kelvin (J/(g·K)); si | Specialist units | Joule per gram kelvin: base (j-kg-k) = value × 1000. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Thermochemical calorie per gram kelvin (cal th/(g·K)); si | Specialist units | Thermochemical calorie per gram kelvin: base (j-kg-k) = value × 4184. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| BTU (IT) per pound Fahrenheit (BTU IT/(lb·°F)); si | Specialist units | BTU (IT) per pound Fahrenheit: base (j-kg-k) = value × 4186.8. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Joule/kilogram/K (J/(kg)/(K)); other | Specialist units | joule/kilogram/K = 1.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Joule/kilogram/°C (J/(kg)/(K)); other | Specialist units | joule/kilogram/°C = 1.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Joule/gram/°C (J/(g)/(K)); other | Specialist units | joule/gram/°C = 1000.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilojoule/kilogram/K (kJ/(kg)/(K)); other | Specialist units | kilojoule/kilogram/K = 1000.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilojoule/kilogram/°C (kJ/(kg)/(K)); other | Specialist units | kilojoule/kilogram/°C = 1000.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Calorie (IT)/gram/°C (cal IT/(g)/(K)); other | Specialist units | calorie (IT)/gram/°C = 4186.8 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Calorie (IT)/gram/°F (cal IT/(g)/(Δ°F)); other | Specialist units | calorie (IT)/gram/°F = 7536.24 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Calorie (th)/gram/°C (cal th/(g)/(K)); other | Specialist units | calorie (th)/gram/°C = 4184.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocalorie (IT)/kilogram/°C (kcal IT/(kg)/(K)); other | Specialist units | kilocalorie (IT)/kilogram/°C = 4186.8 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocalorie (th)/kilogram/°C (kcal th/(kg)/(K)); other | Specialist units | kilocalorie (th)/kilogram/°C = 4184.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocalorie (IT)/kilogram/K (kcal IT/(kg)/(K)); other | Specialist units | kilocalorie (IT)/kilogram/K = 4186.8 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocalorie (th)/kilogram/K (kcal th/(kg)/(K)); other | Specialist units | kilocalorie (th)/kilogram/K = 4184.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilogram-force meter/kilogram/K (kgf·m/(kg)/(K)); other | Specialist units | kilogram-force meter/kilogram/K = 9.80665 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Pound-force foot/pound/°R (lbf·ft/(lb)/(Δ°R)); other | Specialist units | pound-force foot/pound/°R = 5.380320455999999 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (IT)/pound/°F (BTU IT/(lb)/(Δ°F)); other | Specialist units | Btu (IT)/pound/°F = 4186.8 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (th)/pound/°F (BTU th/(lb)/(Δ°F)); other | Specialist units | Btu (th)/pound/°F = 4184.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (IT)/pound/°R (BTU IT/(lb)/(Δ°R)); other | Specialist units | Btu (IT)/pound/°R = 4186.8 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (th)/pound/°R (BTU th/(lb)/(Δ°R)); other | Specialist units | Btu (th)/pound/°R = 4184.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (IT)/pound/°C (BTU IT/(lb)/(K)); other | Specialist units | Btu (IT)/pound/°C = 2326.0 j-kg-k, derived from the component SI/customary definitions. Common use: Specific Heat Capacity. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of specific heat capacity conversions
All 24 specific heat capacity units convert through Joule per kilogram kelvin (J/(kg·K)). 24 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.