Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Celsius Heat Units to Joules Converter (CHU to J)
joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
A Celsius heat unit is the heat to raise 1 pound of water by 1 °C — about 1,899 J. Old HVAC and process papers use CHU. If you expected BTU, you are on the Fahrenheit twin (1 lb × 1 °F). Do not mix them in a load calc.
Celsius heat units
CHU → J
1,899.1 J
1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
- You typed
- 1 CHU
- One J is
- 0 CHU
- How it’s calculated
- joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Celsius heat units
The “Celsius heat units” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
A Celsius heat unit is the heat to raise 1 pound of water by 1 °C — about 1,899 J. Old HVAC and process papers use CHU. If you expected BTU, you are on the Fahrenheit twin (1 lb × 1 °F). Do not mix them in a load calc. joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical). Example: 1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
Example: 1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
When to use this Celsius Heat Units to Joules
Common use cases
- A Celsius heat unit is the heat to raise 1 pound of water by 1 °C — about 1,899 J. Old HVAC and process papers use CHU. If you expected BTU, you are on the Fahrenheit twin (1 lb × 1 °F). Do not mix them in a load calc.
- Sanity-check with this case: 1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
- The relationship is: joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Celsius heat units
- joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
- Example on the page: 1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
How to Convert Celsius Heat Units to Joules Step-by-Step
- 1Enter Celsius heat units. Use the values you have, not a catalog average, unless that is all you know.
- 2joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
- 3Worked case: 1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).
1 CHU → 1,899 J. 10 CHU → 18.99 kJ. 1 CHU ≈ 1.8 BTU.
Example: set Celsius heat units = 1, then read the result.
Variable definitions
- value
Celsius heat units
The “Celsius heat units” field. Default 1; typical range 0–1000000000.
- The conversion (joules = CHU × 1,899.1005 (1 lb water × 1 °C, thermochemical).) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
A kcal raises 1 kg of water 1 °C (4,184 J). CHU raises 1 lb (0.4536 kg) 1 °C.
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- Appliance Running CostCost = watts × hours / 1000 × $/kWh. A 1,500 W space heater for 4 hours at $0.16/kWh is $0.96. The supply rate on the bill is the one that matters, not a national average.
- Astronomical Units to KilometersThe IAU 2012 astronomical unit is exactly 149,597,870,700 m — about 149.6 million km. Earth–Sun mean distance sits on that stick. Mars at 1.524 au is not a NASA press-round; it is that constant times 1.524.
- Atomic Mass Units to GramsDaltons (u) are how chemists weigh atoms. Carbon-12 is defined as 12 u. The gram is 6.022 × 10²³ of those, which is why a mole of carbon is 12 g. This page is for lab sheets, not grocery bags.
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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