Heat Transfer Calculator
Heat transfer calculator (Q = mcΔT) — enter three of heat energy, mass, specific heat and temperature change, solve for the fourth in SI units. Curriculum-aligned.
Heat Transfer Calculator
Enter any three values and leave the fourth blank — the calculator solves for it. Results are in SI units, with a US/imperial readout below.
- Curriculum
- English (global) — Cambridge International + IB
- Built against
- Cambridge IGCSE Physics 0625 + IB Diploma (2023–2025) — Thermal Energy
- Unit system
- SI primary; US/imperial readout below
- First published
- 2 Jun 2026
- Last updated
- 2 Jun 2026
View authoritative scientific sources
- NIST SP 811 (2008), §3 — units & conversions
- BIPM SI Brochure, 9th edition (2019)
- CRC Handbook — specific heat capacities
- Specific heat — Encyclopædia Britannica
⚠️ Educational use only — see full disclaimer
EDUCATIONAL USE DISCLAIMER
This calculator is provided for educational and reference purposes only. It is not a substitute for instruction from a qualified teacher, your prescribed textbook, or your school's official curriculum materials.
When preparing for examinations, always cross-check our calculations and notation against your current syllabus and your teacher's guidance. Syllabus conventions and accepted notation vary between curricula and may change between examination years.
If you believe any calculation, notation, or curriculum reference in this tool is inaccurate, please let us know via the feedback button. We review feedback promptly and update tools when verified corrections are needed.
RECATOOLS accepts no liability for academic, examination, professional, or research outcomes arising from use of this tool.
How to Use the Heat Transfer Calculator
Pick your curriculum
Use the curriculum pills above to match your syllabus (Cambridge/IB, 高考 or SPM). Terminology and the whole page follow your selection.
Enter three values
Type three of heat energy, mass, specific heat and temperature change — leave the one you want to find blank. Each field has a unit selector.
Read the SI result
The answer is shown in SI units — joules (J), kilograms (kg), J/(kg·K), kelvin (K) — with a US/imperial readout for energy and mass.
Check against your syllabus
The Tool Information block shows exactly which syllabus this is built against. Spot something off? Use the feedback button.
Heat Transfer, in Your Curriculum's Words
Heat Transfer (Q = mass × specific heat × ΔT)
Example: How much heat is needed to warm 2.0 kg of water by 5.0 °C? The specific heat of water is 4200 J/(kg·K).
Given: m = 2.0 kg, c = 4200 J/(kg·K), ΔT = 5.0 K. Using Q = mcΔT:
Q = 2.0 × 4200 × 5.0 = 42 000 J
The heat transfer equation relates the heat energy absorbed or released by a substance to its mass, specific heat capacity and temperature change: Q = mcΔT. Energy is in joules (J), mass in kilograms (kg), specific heat in joules per kilogram per kelvin (J/(kg·K)), and the temperature change in kelvin (K) or degrees Celsius (which are the same size). Rearranged, the same equation gives any one of the four quantities.
Water has a very high specific heat — 4200 J/(kg·K) — which is why it takes a lot of energy to heat and makes a good coolant. Because it is a change in temperature, one degree Celsius is the same size as one kelvin, so ΔT is identical in both scales. SI is always the primary result, with a US/imperial readout for energy and mass. All calculation happens in your browser — nothing is uploaded, and it works offline once loaded.
Water soaks up a great deal of heat for a small temperature change — which is why the oceans moderate the Earth's climate.
10 Facts About Heat Transfer
The heat equation is Q = mcΔT, measured in joules.
Water's specific heat is 4200 J/(kg·K) — very high.
A change of 1 °C is the same size as 1 K.
Metals have a low specific heat — they heat up quickly.
A positive Q means heat is absorbed; negative means released.
This equation excludes changes of state (latent heat).
One calorie is 4.184 J — the heat to raise 1 g of water by 1 °C.
Oceans moderate climate because of water's high specific heat.
The joule is the same energy unit for heat, work and kinetic energy.
This calculator runs in your browser — your working stays private.
Frequently Asked Questions
- Q = mcΔT — heat energy equals mass times specific heat capacity times the change in temperature. Rearranged, you can solve for any one of the four quantities. The calculator uses SI units and shows the answer in joules, with a calorie/BTU readout.
- SI units: joules (J) for energy, kilograms (kg) for mass, J/(kg·K) for specific heat, and kelvin (K) for the temperature change. You may enter kJ or calories for energy, g or lb for mass, and °C or °F for the temperature change; the tool converts everything to SI. Energy and mass also show a US/imperial readout.
- Specific heat capacity is the energy needed to raise the temperature of 1 kg of a substance by 1 K (or 1 °C). Water has a very high value, 4200 J/(kg·K), while metals like copper are much lower, about 385 J/(kg·K).
- For a change in temperature, both give the same value because one degree Celsius is the same size as one kelvin. Only for absolute temperatures (not changes) do the scales differ. The calculator accepts either.
- No. Q = mcΔT only applies while the substance stays in the same state (e.g. water staying liquid). For melting or boiling you need latent heat (Q = mL), which is a separate calculation.
- The physics — Q = mcΔT in SI units — is identical worldwide. What changes is the terminology; "specific heat" is 比热容 in Chinese. The calculated value is the same.
- The Tool Information block lists the exact syllabus for your selected curriculum (e.g. SPM Fizik 4531). It is a study aid, not a substitute for your official syllabus or teacher.
- No. Every calculation runs in your browser; nothing you type is uploaded. It works offline once the page has loaded.
- Completely free, no account or usage limit. It runs entirely in your browser and collects no data.
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