Our Heating, Ventilation & Engineering Calculators are built for professionals and serious DIYers who need accurate technical data. Whether you’re sizing a boiler for a new house, determining the right duct diameter for an HVAC system, or selecting a cable for a three‑phase installation – these tools use industry‑standard formulas to give you reliable results in seconds. They cover everything from heat loss calculations to pipe flow rates, and are invaluable for planning, installing, and troubleshooting modern building services.
Ventilation Airflow Calculator: Determine Required Airflow and Duct Size Ventilation is essential for maintaining healthy indoor air quality. Whether you’re designing a bathroom extract system, a kitchen ventilation hood, or a whole-house MVHR system, you need to know how much air must be moved and what size duct will carry it efficiently. Too little airflow…
MVHR Sizing Calculator: Estimate Airflow, Ducts, and Costs Accurately Mechanical Ventilation with Heat Recovery (MVHR) is the gold standard for energy-efficient ventilation in modern homes. It continuously supplies fresh filtered air to living spaces while extracting stale, moisture-laden air from kitchens and bathrooms, recovering up to 95% of the heat in the process. But sizing…
Extract Fan Sizing Calculator: Choose the Right Fan for Bathrooms, Kitchens, and More Extract fans are essential for removing moisture, odours, and pollutants from bathrooms, kitchens, utility rooms, and other spaces. But choosing the wrong fan can lead to poor ventilation, excessive noise, or wasted energy. An undersized fan won’t clear steam and humidity effectively;…
Duct Sizing Calculator: Find the Right Duct Size for Your Airflow Correct duct sizing is fundamental to any efficient HVAC or ventilation system. If ducts are too small, air velocity increases, causing noise, high pressure drop, and excessive energy consumption. If ducts are too large, they waste material, take up valuable space, and increase installation…
Frequently Asked Questions (FAQ) Duct pressure drop is a critical parameter in HVAC design. It determines the fan static pressure required to move air through the ductwork, which directly affects fan selection, energy consumption, and system performance. Whether you’re designing a residential ventilation system, a commercial HVAC layout, or an industrial exhaust network, accurate pressure…
Solar Panel Output Calculator: Estimate Generation, Savings, and Payback Solar panels are a smart investment for many homes and businesses, but their financial and environmental benefits depend on several factors: system size, location, orientation, electricity prices, and how much of the generated power you actually use. Our Solar Panel Output Calculator is a free online tool that…
Lighting Fixture Count Calculator: Determine the Right Number of Lights Proper lighting is essential for comfort, productivity, and safety in any space. Whether you’re designing a home office, a commercial kitchen, or a warehouse, getting the lighting right means having enough fixtures to achieve the desired illuminance without over-lighting and wasting energy. Our Lighting Fixture Count…
kW ↔ kVA Converter: Convert Real and Apparent Power Accurately In electrical engineering, power is expressed in several ways: real power (kW), apparent power (kVA), and reactive power (kVAR). Understanding the relationship between these values is essential for sizing generators, cables, transformers, and protective devices. Our kW ↔ kVA Converter is a free online tool that instantly…
Backup Generator Sizing Calculator: Choose the Right Generator Accurately A backup generator is an essential investment for homes and businesses that cannot afford downtime. Whether you’re protecting against grid outages, powering a remote site, or providing emergency backup for critical systems, choosing the right generator size is crucial. An undersized generator will trip, overheat, or…
Cable Size (Three-Phase) Calculator: Choose the Right Conductor Size Three-phase power is the backbone of industrial, commercial, and large residential electrical systems. From motors and HVAC equipment to distribution boards, three-phase circuits carry higher power with greater efficiency. But with higher power comes the need for careful cable sizing. An undersized three-phase cable can overheat,…
