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Radiant Heat Calculator – Calculate radiant heat and net heat exchange instantly using the Stefan-Boltzmann Law. Fast, accurate, beginner-friendly online tool.
Understanding how heat travels through radiation is important in physics, engineering, HVAC design, and thermal analysis. To make this process simple for everyone, we developed an easy-to-use Radiant Heat Calculator. With this tool, users can calculate radiant heat emitted by a surface or the net radiant heat exchange between two bodies in just a few seconds. This article explains radiant heat in a simple way, describes the formulas used, and shows how you can use the calculator effectively.
Radiant heat is the transfer of energy through electromagnetic waves. Unlike conduction or convection, radiant heat does not need air, water, or any medium to travel. Even in vacuum, objects emit thermal radiation based on their temperature.
Every object with a temperature above absolute zero emits infrared radiation. Hotter objects emit more energy. The amount of radiation depends on temperature, surface area, and emissivity.
Our Radiant Heat Calculator helps you find this heat transfer rate instantly using standard physics formulas.
Radiant heat is calculated using the Stefan-Boltzmann Law, one of the most important equations in thermal science. The formula depends on the calculation type: single object emission or net heat exchange.
To calculate the radiant heat emitted by a single surface:
Q = ε σ A T⁴
Where:
This formula shows that radiation increases rapidly with temperature because it depends on T⁴.
To calculate heat transfer between a hot surface and a cooler surrounding:
Qnet = F ε σ A (Th⁴ − Tc⁴)
Where:
A positive value means heat flows from the hot object to the cold one. A negative value indicates heat entering the object from its surroundings.
Using our online Radiant Heat Calculator is simple. First, choose the calculation type: single object emission or net heat exchange. Enter the emissivity, surface area, and temperatures. You may select units such as Kelvin, Celsius, Fahrenheit, and various area units. The calculator automatically converts everything into SI units and shows a clear step-by-step solution. Finally, it displays the heat transfer result in watts.
This tool helps engineers, students, HVAC designers, and researchers perform accurate thermal radiation calculations quickly. Instead of solving complex formulas manually, you get instant results with proper unit conversions, detailed working steps, and clean explanations. It is especially helpful for radiant floor heating, fire safety calculations, furnace analysis, solar radiation studies, and building energy design.
The Radiant Heat Calculator is a reliable and user-friendly tool for anyone needing accurate thermal radiation calculations. It applies the Stefan-Boltzmann Law, converts units automatically, and provides clear solutions that even beginners can understand. Whether you're analyzing heat loss, studying thermal physics, or designing heating systems, this calculator gives fast and precise results every time.
Radiant heat is the transfer of thermal energy through electromagnetic waves, mainly infrared radiation.
It uses the Stefan-Boltzmann equation: Q = ε σ A T⁴ for single object emission and Qnet = F ε σ A (Th⁴ − Tc⁴) for net heat exchange.
Emissivity is a measure of how well a surface emits radiation, ranging from 0 to 1.
Yes, the calculator supports Kelvin, Celsius, and Fahrenheit. It converts all temperatures automatically.
It is σ = 5.67 × 10⁻⁸ W/m²·K⁴, a universal constant used in radiant heat calculations.
Students, engineers, HVAC professionals, researchers, and anyone working with heat transfer.