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Joule to Calorie

Professional J to cal conversion.

Joule
The SI unit of work or energy, equal to the work done by a force of one newton.
Calorie
Amount of heat needed to raise the temperature of 1g of water by 1°C.
Quick LinksLogic & FormulaFAQ
0.23900574
Unit
  • Electronvolt
    eV
  • Attojoule
    aJ
  • Rydberg energy
    Ry
  • Hartree energy
    Eh
  • Kiloelectron-volt
    keV
  • Megaelectron-volt
    MeV
  • Nanojoule
    nJ
  • Dyne-centimeter
    dyn·cm
  • Erg
    erg
  • Microjoule
    µJ
  • Gram-force centimeter
    gf·cm
  • Millijoule
    mJ
  • Inch-ounce
    in·ozf
  • Ounce-force inch
    ozf·in
  • Gram-force meter
    gf·m
  • Poundal foot
    pdl·ft
  • Kilogram-force centimeter
    kgf·cm
  • Inch-pound
    in·lbf
  • Pound-force inch
    lbf·in
  • Joule
    J
  • Newton-meter
    N·m
  • Watt-second
    W·s
  • Foot-pound
    ft·lbf
  • Pound-force foot
    lbf·ft
  • Calorie
    cal
  • Calorie (th)
    cal (th)
  • Calorie (IT)
    cal (IT)
  • Kilogram-force meter
    kgf·m
  • Kilopond meter
    kp·m
  • Kilojoule
    kJ
  • Kilowatt-second
    kW·s
  • BTU (th)
    Btu (th)
  • BTU (IT)
    Btu (IT)
  • BTU
    BTU
  • Watt-hour
    Wh
  • Food Calorie
    Cal
  • Kilocalorie
    kcal
  • Kilocalorie (th)
    kcal (th)
  • Calorie (nutritional, IT)
    Cal
  • Kilocalorie (IT)
    kcal (IT)
  • Megajoule
    MJ
  • Horsepower (Metric) hour
    PS·h
  • Horsepower hour
    hp·h
  • Kilowatt-hour
    kWh
  • Ton-hour (refrigeration)
    TR·h
  • Therm (US)
    therm (US)
  • Therm
    therm
  • Therm (EC)
    therm (EC)
  • Gigajoule
    GJ
  • Mega BTU (IT)
    MBtu (IT)
  • Megawatt-hour
    MWh
  • Ton (TNT)
    ton TNT
  • Fuel oil equivalent (barrel US)
    FOE/bbl
  • Fuel oil equivalent (kiloliter)
    FOE/kL
  • Gigawatt-hour
    GWh
  • Kiloton (TNT)
    kton
  • Megaton (TNT)
    Mton
  • Gigaton (TNT)
    Gton
Unit
  • Electronvolt
    eV
  • Attojoule
    aJ
  • Rydberg energy
    Ry
  • Hartree energy
    Eh
  • Kiloelectron-volt
    keV
  • Megaelectron-volt
    MeV
  • Nanojoule
    nJ
  • Dyne-centimeter
    dyn·cm
  • Erg
    erg
  • Microjoule
    µJ
  • Gram-force centimeter
    gf·cm
  • Millijoule
    mJ
  • Inch-ounce
    in·ozf
  • Ounce-force inch
    ozf·in
  • Gram-force meter
    gf·m
  • Poundal foot
    pdl·ft
  • Kilogram-force centimeter
    kgf·cm
  • Inch-pound
    in·lbf
  • Pound-force inch
    lbf·in
  • Joule
    J
  • Newton-meter
    N·m
  • Watt-second
    W·s
  • Foot-pound
    ft·lbf
  • Pound-force foot
    lbf·ft
  • Calorie
    cal
  • Calorie (th)
    cal (th)
  • Calorie (IT)
    cal (IT)
  • Kilogram-force meter
    kgf·m
  • Kilopond meter
    kp·m
  • Kilojoule
    kJ
  • Kilowatt-second
    kW·s
  • BTU (th)
    Btu (th)
  • BTU (IT)
    Btu (IT)
  • BTU
    BTU
  • Watt-hour
    Wh
  • Food Calorie
    Cal
  • Kilocalorie
    kcal
  • Kilocalorie (th)
    kcal (th)
  • Calorie (nutritional, IT)
    Cal
  • Kilocalorie (IT)
    kcal (IT)
  • Megajoule
    MJ
  • Horsepower (Metric) hour
    PS·h
  • Horsepower hour
    hp·h
  • Kilowatt-hour
    kWh
  • Ton-hour (refrigeration)
    TR·h
  • Therm (US)
    therm (US)
  • Therm
    therm
  • Therm (EC)
    therm (EC)
  • Gigajoule
    GJ
  • Mega BTU (IT)
    MBtu (IT)
  • Megawatt-hour
    MWh
  • Ton (TNT)
    ton TNT
  • Fuel oil equivalent (barrel US)
    FOE/bbl
  • Fuel oil equivalent (kiloliter)
    FOE/kL
  • Gigawatt-hour
    GWh
  • Kiloton (TNT)
    kton
  • Megaton (TNT)
    Mton
  • Gigaton (TNT)
    Gton
Precision: 8 decimal places

Logic & Formula

To convert Joule to Calorie, we use the specific conversion ratio for this category. 1 J is equal to 0.23900574 cal.

Value in cal = (Value in J * 1) / 4.184

Unit Definitions

Joule

The SI unit of work or energy, equal to the work done by a force of one newton.

Calorie

Amount of heat needed to raise the temperature of 1g of water by 1°C.

Verified 2026 Standards
Industrial Precision

How to convert Joule to Calorie?

Enter the value in Joule, choose the target unit Calorie, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.

Formula: Value in cal = Value in J × 0.23900574

Common Conversions Table

Value (J)Result (cal)
10.23900574
102.39005736
255.9751434
5011.95028681
10023.90057361
1000239.00573614

FAQ

What is the conversion formula from J to cal?
Value in cal = Value in J × 0.23900574
What is the smallest unit in Energy?
The smallest unit (as defined on this site) is: Electronvolt (eV). For higher precision, convert using a smaller unit first.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

About this conversion

This page converts Joule to Calorie using verified ratios and includes tables, examples, and FAQs for quick verification.

Joule
The SI unit of work or energy, equal to the work done by a force of one newton.
Calorie
Amount of heat needed to raise the temperature of 1g of water by 1°C.

Formula and precision

Value in cal = Value in J × 0.23900574
1 J is equal to 0.23900574 cal.
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.
  • Use smaller units for higher precision, then convert back if needed.
  • Temperature and fuel categories can’t be reduced to one constant multiplier.
  • Symbols vary by region (US/UK gallons, metric vs. imperial abbreviations).
  • For engineering work, validate with a second reference and keep unit symbols.

Quick examples

Example: 1 J = 0.23900574 cal.

Value (J)Result (cal)
10.23900574
12.52.9875717
5011.95028681
10023.90057361

Common mistakes and definitions

  • Rounding too early (convert first, then round at the end).
  • Mixing similar-looking symbols (for example, “m” vs “mm”, or “b” vs “B”).
  • Copying values without the unit symbol, which makes validation harder.

Common Conversions Table

Joule (J)Calorie (cal)
10.23900574
20.47801147
30.71701721
51.19502868
102.39005736
255.9751434
5011.95028681
10023.90057361
25059.75143403
500119.50286807
1000239.00573614

Category facts

Smallest unit (on this site)
Electronvolt (eV)
Largest unit (on this site)
Gigaton (TNT) (Gton)

Popular conversions

Back to Energy category Browse more related converters below.

Joule → CalorieJoule → Kilowatt-hourKilojoule → KilocalorieCalorie → JouleBTU → JouleJoule → ElectronvoltJoule → Gram-force meterJoule → Kilojoule

Related conversions

Convert Joule to:
Watt-secondNewton-meterPound-force footFoot-poundCalorie (th)Calorie (IT)Pound-force inchInch-pound
Convert to Calorie from:
Kilogram-force meterKilopond meterKilogram-force centimeterPoundal footKilojouleKilowatt-secondBTU (th)BTU (IT)

FAQ

How to convert Joule to Calorie?
Enter the value in Joule, choose the target unit Calorie, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.
What is the conversion formula from J to cal?
Value in cal = Value in J × 0.23900574
What is the smallest unit in Energy?
The smallest unit (as defined on this site) is: Electronvolt (eV). For higher precision, convert using a smaller unit first.
Why can results differ between websites?
Different standards, rounding rules, and unit definitions can change results. This page shows the formula used for transparency.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

More Related Energy Tools

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Did you know?

Convert between Joules, Calories, BTU, and Watt-hours. Precision is the cornerstone of our platform. We utilize 15-digit floating-point arithmetic to ensure results meet 2026 industrial and academic verification standards. Looking for other types of calculations? Explore our Main Dashboard for 100,000+ precision permutations.