Engineering calculation tools

Free engineering calculators.

Use 18 free calculator pages for building-services design checks, including separate cooling and heating load modes. The signed-in Adelphos catalogue contains 48 live calculator entries. These counts overlap where the same calculation is available on the public website and in the app.

Available now

18 free web calculators.

Enter the known project inputs, review the protected result and download a branded PDF report where available.

Cable Sizing CalculatorOpen calculator → Condensate Drainage Fall CalculatorOpen calculator → Duct Sizing CalculatorOpen calculator → Electrical Load Assessment CalculatorOpen calculator → EPC Improvement CalculatorOpen calculator → Heat Loss CalculatorOpen calculator → Heat Pump CalculatorOpen calculator → Heating Zone CalculatorOpen calculator → Hot Water Cylinder Sizing CalculatorOpen calculator → Lighting Lux CalculatorOpen calculator → Passivhaus Heat Demand EstimateOpen calculator → Pipe Sizing CalculatorOpen calculator → Pump Power CalculatorOpen calculator → Room Cooling and Heating Load CalculatorOpen calculator → SAP CalculatorOpen calculator → Scientific CalculatorOpen calculator → Solar PV CalculatorOpen calculator → Ventilation CalculatorOpen calculator →
Adelphos app catalogue

Heating, plant and distribution calculators.

Open the calculator's registered app route. Sign-in and project access may be required.

Ground Floor U-Value CalculatorOpen in Adelphos → Heat Loss CalculatorOpen in Adelphos → Boiler Plant Sizing CalculatorOpen in Adelphos → Heat Pump Plant Sizing CalculatorOpen in Adelphos → Buffer Vessel CalculatorOpen in Adelphos → Expansion Vessel CalculatorOpen in Adelphos → Pump Power CalculatorOpen in Adelphos → Boiler Vent Louvre SizingOpen in Adelphos → Boiler Safety Valve SizingOpen in Adelphos → Pipe and Duct SizingOpen in Adelphos → Building Services ConvertersOpen in Adelphos →
Mechanical

Ventilation and air-side calculators.

Registered app calculators for ventilation rates, natural ventilation, air systems, cooling and room pressure calculations.

Ventilation CalculatorOpen in Adelphos → AM10 Isolated-Space Natural VentilationOpen in Adelphos → AM10 Single-Cell Natural VentilationOpen in Adelphos → AM10 Chimney Natural VentilationOpen in Adelphos → Destratification CalculatorOpen in Adelphos → Displacement Ventilation StratificationOpen in Adelphos → Ventilation Register CalculatorOpen in Adelphos → AHU Sizing CalculatorOpen in Adelphos → Kitchen Extract CalculatorOpen in Adelphos → Car Park Ventilation CalculatorOpen in Adelphos → Room Pressurisation CalculatorOpen in Adelphos → Room Pressurisation RegisterOpen in Adelphos → Condensate Drain and Trap CalculatorOpen in Adelphos → Chiller Load Sizing CalculatorOpen in Adelphos → VRV and VRF SizingOpen in Adelphos Chat →
Public health

Water and drainage calculators.

Registered app calculators for domestic water, storage, boosting and drainage design tasks.

Domestic Hot Water CalculatorOpen in Adelphos → CWS Booster and Tank CalculatorOpen in Adelphos → Break Tank CalculatorOpen in Adelphos → Domestic Water Service Pipe SizingOpen in Adelphos → Drainage Stack Sizing CalculatorOpen in Adelphos → Drainage Discharge Units CalculatorOpen in Adelphos →
Electrical, energy and compliance

Load, lighting and energy calculators.

Registered app calculators for electrical design, utility loads, energy estimates and refrigerant compliance checks.

Cable Sizing CalculatorOpen in Adelphos → Lighting Lux CalculatorOpen in Adelphos → Electrical Load AssessmentOpen in Adelphos → Gas Load AssessmentOpen in Adelphos → Water Load AssessmentOpen in Adelphos → PHPP Heat-Demand EstimateOpen in Adelphos → SAP CalculatorOpen in Adelphos → R32 Compliance CalculatorOpen in Adelphos →
Equipment selection

Building-services selectors.

These registered app routes are currently included in the calculator catalogue and are identified as selectors.

Boiler SelectorOpen in Adelphos → Water Heater SelectorOpen in Adelphos → Booster Set SelectorOpen in Adelphos → Extract Fan SelectorOpen in Adelphos → CWS Tank SelectorOpen in Adelphos → Expansion Vessel SelectorOpen in Adelphos → Pump SelectorOpen in Adelphos → System Pressurisation Unit SelectorOpen in Adelphos →
Calculator questions

Engineering calculator FAQs.

Are the Adelphos engineering calculators free?

The 18 public calculator pages are free to use. The Adelphos app also contains 48 live calculator entries, with some calculations available in both places.

What engineering calculations can I complete?

The public library covers HVAC, electrical, energy, lighting, solar, drainage and building-services calculations. Adelphos Chat provides additional guided sizing, selection, psychrometric, ventilation and risk-assessment workflows.

What is the difference between a free calculator and an app calculator?

A free calculator runs from a public website page. An app calculator opens the registered calculator route in Adelphos and can retain the calculation within the signed-in project workflow.

Do calculator results replace engineering review?

No. Verify the inputs, assumptions, applicable standards and output before using a result for design, procurement, installation or construction.