Convert BTU per Pound to Calories per Gram
Instantly convert BTU per Pound (BTU/lb) to Calories per Gram (cal/g) with our free online calculator.
Formula: BTU/lb to cal/g — multiply by 0.555927
Reference Table
| BTU per Pound (BTU/lb) | Calories per Gram (cal/g) |
|---|---|
| 1 | 0.555927 |
| 5 | 2.77964 |
| 10 | 5.55927 |
| 25 | 13.8982 |
| 50 | 27.7964 |
| 100 | 55.5927 |
How to Convert BTU per Pound to Calories per Gram
Formula
To convert BTU per Pound (BTU/lb) to Calories per Gram (cal/g): multiply by 0.555927
Step-by-Step
- Start with your value in BTU per Pound (BTU/lb).
- Multiply by 0.555927 to perform the conversion.
- The result is your value expressed in Calories per Gram (cal/g).
Conversion Factor
1 BTU/lb = 0.555927 cal/g
Reverse Factor
1 cal/g = 1.7988 BTU/lb
Worked Example
Convert 25 BTU per Pound to Calories per Gram: 25 BTU/lb = 13.8982 cal/g
About BTU per Pound (BTU/lb)
An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055.06 J / 0.45359237 kg = 2,326.000 J/kg). BTU/lb is dominant on US steam tables, HVAC enthalpy/psychrometric calculations per ASHRAE Handbook Fundamentals chapter 1, heating-fuel and refining specific-energy reporting per API MPMS and GPSA Engineering Data Book, and natural-gas heating-value certification. Reference values: natural gas heating value (residential pipeline grade) ~22,000 BTU/lb HHV (higher heating value with water-vapor condensation credit); LNG 21,500 BTU/lb; #2 fuel oil ~19,500 BTU/lb; gasoline 19,500-20,000 BTU/lb LHV; coal anthracite 13,000-15,000 BTU/lb; bituminous 10,500-14,000 BTU/lb per ASTM D388 classification; sub-bituminous 8,500-13,000 BTU/lb; lignite 4,000-8,300 BTU/lb. Saturated liquid water at 70°F: h_f ≈ 38.1 BTU/lb; saturated steam at 14.7 psia: h_g ≈ 1,150.5 BTU/lb. Refrigerant enthalpy/entropy tables in US-edition ASHRAE Handbook and US-customary printings of Mollier h-s diagrams use BTU/lb throughout. Convert BTU/lb to kJ/kg by multiplying by 2.326.
About Calorie per Gram (cal/g)
A CGS specific-energy unit equal to exactly 4,184 J/kg (using the thermochemical calorie definition per NIST SP 811), numerically identical to kcal/kg. cal/g is the working unit for chemistry reaction enthalpies per unit mass (heats of combustion measured in bomb calorimeters per ASTM D240 / D5865), food science nutritional energy (1 dietary 'Calorie' = 1 kcal = 1,000 cal — a confusing convention that persists despite ISO 80000-5 deprecation), thermochemistry per the NIST WebBook and Linstrom-Mallard NIST Standard Reference Database 69, and DSC (Differential Scanning Calorimetry) integration output for biological and pharmaceutical samples (TA Instruments, Mettler Toledo, PerkinElmer instruments default to cal/g for some legacy methods). Reference values per Atkins Physical Chemistry: water heat of vaporization at 100°C ≈ 540 cal/g; ice heat of fusion ≈ 80 cal/g; sucrose heat of combustion ≈ 3,940 cal/g; protein heat of combustion ≈ 4,100 cal/g; fats/oils ≈ 9,200 cal/g (the basis of the '9 calories per gram' nutritional rule of thumb for fat). Food labels outside the US showing 'kcal per 100g' display this unit scaled to a 100-gram serving size.
Quick Facts
- 1 BTU per Pound equals 0.555927 Calories per Gram
- 1 Calorie per Gram equals 1.7988 BTU per Pound
- BTU per Pound is a unit of specific energy
- Calorie per Gram is a unit of specific energy
- This conversion is commonly used in fuel comparison, battery technology, and rocket propulsion
- The BTU per Pound belongs to the imperial system
- The Calorie per Gram belongs to the metric system
Common BTU per Pound to Calorie per Gram Conversions
| BTU per Pound (BTU/lb) | Calories per Gram (cal/g) |
|---|---|
| 0.01 | 0.00555927 |
| 0.1 | 0.0555927 |
| 0.25 | 0.138982 |
| 0.5 | 0.277964 |
| 1 | 0.555927 |
| 2 | 1.11185 |
| 3 | 1.66778 |
| 5 | 2.77964 |
| 10 | 5.55927 |
| 15 | 8.33891 |
| 20 | 11.1185 |
| 25 | 13.8982 |
| 50 | 27.7964 |
| 75 | 41.6946 |
| 100 | 55.5927 |
| 250 | 138.982 |
| 500 | 277.964 |
| 1000 | 555.927 |
| 5000 | 2779.64 |
| 10000 | 5559.27 |
Understanding BTU per Pound
The BTU per Pound (symbol: BTU/lb) is a unit of specific energy. An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055.06 J / 0.45359237 kg = 2,326.000 J/kg). BTU/lb is dominant on US steam tables, HVAC enthalpy/psychrometric calculations per ASHRAE Handbook Fundamentals chapter 1, heating-fuel and refining specific-energy reporting per API MPMS and GPSA Engineering Data Book, and natural-gas heating-value certification. Reference values: natural gas heating value (residential pipeline grade) ~22,000 BTU/lb HHV (higher heating value with water-vapor condensation credit); LNG 21,500 BTU/lb; #2 fuel oil ~19,500 BTU/lb; gasoline 19,500-20,000 BTU/lb LHV; coal anthracite 13,000-15,000 BTU/lb; bituminous 10,500-14,000 BTU/lb per ASTM D388 classification; sub-bituminous 8,500-13,000 BTU/lb; lignite 4,000-8,300 BTU/lb. Saturated liquid water at 70°F: h_f ≈ 38.1 BTU/lb; saturated steam at 14.7 psia: h_g ≈ 1,150.5 BTU/lb. Refrigerant enthalpy/entropy tables in US-edition ASHRAE Handbook and US-customary printings of Mollier h-s diagrams use BTU/lb throughout. Convert BTU/lb to kJ/kg by multiplying by 2.326.
It belongs to the imperial measurement system.
BTU per Pound are commonly used in fuel comparison, battery technology, and rocket propulsion.
Understanding Calories per Gram
The Calorie per Gram (symbol: cal/g) is a unit of specific energy. A CGS specific-energy unit equal to exactly 4,184 J/kg (using the thermochemical calorie definition per NIST SP 811), numerically identical to kcal/kg. cal/g is the working unit for chemistry reaction enthalpies per unit mass (heats of combustion measured in bomb calorimeters per ASTM D240 / D5865), food science nutritional energy (1 dietary 'Calorie' = 1 kcal = 1,000 cal — a confusing convention that persists despite ISO 80000-5 deprecation), thermochemistry per the NIST WebBook and Linstrom-Mallard NIST Standard Reference Database 69, and DSC (Differential Scanning Calorimetry) integration output for biological and pharmaceutical samples (TA Instruments, Mettler Toledo, PerkinElmer instruments default to cal/g for some legacy methods). Reference values per Atkins Physical Chemistry: water heat of vaporization at 100°C ≈ 540 cal/g; ice heat of fusion ≈ 80 cal/g; sucrose heat of combustion ≈ 3,940 cal/g; protein heat of combustion ≈ 4,100 cal/g; fats/oils ≈ 9,200 cal/g (the basis of the '9 calories per gram' nutritional rule of thumb for fat). Food labels outside the US showing 'kcal per 100g' display this unit scaled to a 100-gram serving size.
It belongs to the metric measurement system.
Calories per Gram are commonly used in fuel comparison, battery technology, and rocket propulsion.
Why Convert BTU per Pound to Calories per Gram?
Converting between BTU per Pound and Calories per Gram is a frequent requirement for engineers, scientists, and students working with specific energy values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate specific energy conversion is essential.
Frequently Asked Questions
How do I convert BTU per Pound to Calories per Gram?
An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055. To convert BTU per Pound to Calories per Gram, multiply by 0.555927. For example, 25 BTU/lb equals 13.8982 cal/g.
How many Calories per Gram are in 1 BTU per Pound?
There are 0.555927 Calories per Gram in 1 BTU per Pound.
How many BTU per Pound are in 1 Calorie per Gram?
There are 1.7988 BTU per Pound in 1 Calorie per Gram.
What is the formula for BTU per Pound to Calorie per Gram conversion?
The formula is: multiply by 0.555927. This means 1 BTU/lb = 0.555927 cal/g.
Is a BTU per Pound bigger than a Calorie per Gram?
Yes. One BTU per Pound is larger than one Calorie per Gram because 1 BTU/lb equals 0.555927 cal/g, which is less than 1.
When do you need to convert between BTU per Pound and Calories per Gram?
A CGS specific-energy unit equal to exactly 4,184 J/kg (using the thermochemical calorie definition per NIST SP 811), numerically identical to kcal/kg. BTU per Pound and Calorie per Gram are both specific energy units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.