---
title: "Heat Load Calculators | XTRAW Tools"
description: "Heat load calculators for radiator BTU, heating demand, heat loss, room volume, envelope heat flow, temperature difference, and HVAC planning."
url: "https://xtraw.com/tools/calculators/construction-home-calculators/home-comfort-calculators/heat-load-calculators/dirDesc"
date: "2026-08-20T22:14:35+00:00"
language: "en-GB"
---

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 # Heat Load Calculators

#### Latest Tools

 [ ![Heat Loss Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-heat-loss-calculator-360x360_230x230.jpg) ](https://xtraw.com/tools/calculators/construction-home-calculators/home-comfort-calculators/heat-load-calculators/heat-loss-calculator "Heat Loss Calculator")  new

## [Heat Loss Calculator](https://xtraw.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=2464&virtuemart_category_id=271&Itemid=173)

 Estimate heat loss through walls, ceiling, and windows. Use ...

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 [ ![Radiator BTU Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-radiator-btu-calculator-360x360_230x230.jpg) ](https://xtraw.com/tools/calculators/construction-home-calculators/home-comfort-calculators/heat-load-calculators/radiator-btu-calculator "Radiator BTU Calculator")  new

## [Radiator BTU Calculator](https://xtraw.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=2463&virtuemart_category_id=271&Itemid=173)

 Calculate BTU output needed from a radiator for a given ...

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