Free HVAC, Heating and Thermal Engineering Calculators
Professional online tools for heat exchanger sizing, radiator selection, U-value calculation, R-value calculation, thermal resistance and heating system design.
Engineering Software Applications
Heating Formula provides free browser-based calculators for engineers, technicians, contractors, consultants and students working with HVAC, heating, heat transfer and building energy performance.
Free Online Calculator
Heat Exchanger Calculator
Calculate heat transfer rate, thermal duty, flow rate and key sizing values for heat exchangers used in HVAC, industrial processes and energy systems.
- Heat exchanger sizing
- Heat transfer calculation
- Flow and temperature analysis
Free Online Calculator
U-Value & Thermal Resistance
Calculate U-values, R-values and thermal resistance for insulation materials, walls, roofs, floors and multi-layer building envelope assemblies.
- U-value calculation
- R-value calculation
- Building insulation analysis
Free Online Calculator
Radiator Calculator
Calculate radiator heating capacity and room heating requirements for residential, commercial and HVAC heating system applications.
- Radiator sizing
- Room heating estimate
- Heating capacity calculation
Free Online Calculator
Boiler Sizing Calculator
Calculate required boiler capacity by combining space heating load and domestic hot water tank sizing for residential and commercial systems.
- Space heating load estimate
- DHW tank volume sizing
- Total boiler kW capacity
Free Online Calculator
Pipe Diameter Calculator
Determine the optimal minimum inner diameter and recommended standard pipe size (DN, Copper, PVC, PE) based on flow rate and velocity.
- Hydronic and air pipe sizing
- Velocity and flow analysis
- Multiple material support
Free Online Calculator
Solar Collector Sizing
Calculate the required area, number of panels, and matching thermal storage tank volume for solar water heating systems.
- Solar thermal yield
- Collector array sizing
- Storage tank calculation
Free Online Calculator
Hydrofor Tank Sizing
Calculate the required total volume, useful water volume, and pre-charge pressure for your booster pump expansion tank system.
- Pressure vessel sizing
- Pump cycle optimization
- Pre-charge calculation
Free Online Calculator
Boiler Flue Sizing
Determine the flue gas flow and minimum inner diameter required for safe and efficient boiler chimney draft operations.
- Chimney draft velocity
- Flue gas flow calculation
- Standard pipe size selection
Free Online Tool
Engineering Unit Converter
Instantly convert complex engineering units including power, pressure, temperature, volumetric flow, and linear dimensions.
- Power & heat transfer units
- Pressure & flow units
- Temperature conversions
Why Use Heating Formula Calculators?
Free and Online
No installation, subscription or registration required.
Built for Engineers
Useful for HVAC design, thermal calculations, heating projects and quick technical checks.
Fast Project Support
Helpful for preliminary design, quotation preparation, site review and engineering comparison.
Common Search Topics
Free HVAC calculator, heating calculator online, heat exchanger calculator, heat exchanger sizing calculator, radiator calculator, radiator sizing calculator, room heating calculator, U-value calculator, R-value calculator, thermal resistance calculator, insulation calculator, building envelope calculator, heat transfer calculator, heating system design calculator, thermal engineering tools and online mechanical engineering calculators.
Frequently Asked Questions
Are Heating Formula calculators free to use?
Yes. All available calculators are free to use online without registration, subscription, or software installation.
Do I need to create an account?
No. You can open the calculator page and start using the tool directly from your browser.
Can I use the calculators on mobile?
Yes. The calculators are web-based and can be used on desktop, tablet, and mobile devices.
Who are these calculators designed for?
They are useful for HVAC engineers, mechanical engineers, technicians, contractors, consultants, students, and building energy professionals.
What is the Heat Exchanger Calculator used for?
It is used to estimate heat transfer rate, thermal duty, flow rate, and key sizing values for heat exchangers.
Can the Heat Exchanger Calculator be used for industrial applications?
Yes. It can support preliminary calculations for HVAC systems, industrial process heating, cooling systems, and energy applications.
What is the U-Value Calculator used for?
It helps calculate U-values, R-values, and thermal resistance for walls, roofs, floors, insulation layers, and building envelope assemblies.
Why is U-value important?
U-value indicates how much heat passes through a building element. A lower U-value usually means better thermal insulation performance.
What is R-value?
R-value measures thermal resistance. A higher R-value means the material or assembly provides better resistance to heat flow.
What is the Radiator Calculator used for?
It helps estimate radiator heating capacity and room heating requirements for residential, commercial, and HVAC heating system projects.
Can I use the Radiator Calculator for room heating estimates?
Yes. It is suitable for quick room heating checks and preliminary radiator selection.
Are the calculators suitable for final engineering design?
They are useful for preliminary design, estimation, comparison, and quotation support. Final engineering design should be verified according to project requirements, local regulations, and applicable standards.
Do I need to download any software?
No. All tools run directly online through a web browser.
Can students use these tools?
Yes. The calculators can help students understand heating, HVAC, heat transfer, insulation, and thermal resistance concepts.
Can contractors use these calculators for quotations?
Yes. They can support quick technical estimates during quotation preparation, but final values should be reviewed before submission.
What industries can benefit from these calculators?
They are useful for HVAC, construction, mechanical engineering, industrial process heating, energy efficiency, facility maintenance, and building services.
Do the calculators replace professional engineering review?
No. They are support tools. Professional review is recommended for final design, equipment selection, and compliance calculations.
Are the calculators suitable for energy efficiency studies?
Yes. The U-value, R-value, and thermal resistance calculator can support building insulation and energy performance analysis.
Can I share these calculators with my team?
Yes. You can share the calculator links with colleagues, clients, students, or project teams.