Heat Capacity Calculator

Science & Engineering

Q=cmΔT heat energy and heating time estimate

Quick Answer

Heat Capacity Calculator: Q=cmΔT heat energy and heating time estimate. Q = cmΔT (c in kJ/(kg·K)).

Material

Custom c (J/(kg·K))

Mass kg

ΔT (K or °C)

Q = cmΔT → Heat energy

167,440 J

Steps

1Q = cmΔT = 4186 × 2 × 20 = 167,440 J
2= 167.4 kJ = 40.0 kcal = 0.047 kWh

Specific heat table (J/(kg·K))

水 ←4186

酒精2440

油2000

冰2090

铝900

玻璃840

铁/钢450

铜385

银235

铅130

混凝土880

空气1005

💡 Water's c=4186 is anomalously high — that's why coastal climates are mild, car engines use water coolant, and a hot water bottle stays warm all night. Note ΔT is identical in K and °C. Practical: boiling 2L water from 20°C costs 2×4186×80 ≈ 0.19 kWh ≈ ¥0.1.

Was this tool helpful?

How to Use

Enter known quantities: fill values and confirm units in the Heat Capacity Calculator.
Instant solution: unknowns solve live with the formula shown transparently.
Use constant/material tables: standard physical constants and material data are listed on this page.
Compare conditions: change inputs to compare scenarios.

Key Points

Heat Capacity Calculator is a free online science & engineering tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: Q=cmΔT heat energy and heating time estimate.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Specific heat & heating time

Q = cmΔT (c in kJ/(kg·K))

Common values: water 4.186 · ethanol 2.44 · oil 2.0 · aluminum 0.90 · iron 0.46 · copper 0.39

Heating time = Q ÷ power (real-world ≈ ×1.2 for heat loss)

1 kcal = 4.186 kJ; 1 kWh = 3600 kJ

Example: 1.5L water from 20°C to boiling: Q ≈ 502 kJ; a 1500W kettle needs ≈5.6 min.

FAQ

How do I use the Heat Capacity Calculator?

Open the page and fill in the input fields — results update automatically. Q=cmΔT heat energy and heating time estimate.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

Related Guides

Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated: 2026-08-04

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Heat Capacity Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/heat-capacity

Results provided by this tool are for reference only and do not constitute professional advice.