Fast, free calculators for everyday MEP design work: a full sprinkler hydraulic calculation, sprinkler flow, pipe friction, ducts, heating and chilled water pipes, ventilation and cables. They run in your browser, need no account and work on your phone on site.
Learn the method behind the numbers
Each calculator links to a step-by-step guide with a worked example; more short articles are in the MEP Library. Popular guides:
- Sprinkler Hydraulic Calculation: A Step-by-Step Worked Example
- Heat Loss Calculation Step by Step: EN 12831 Worked Example
- Duct Sizing Guide: Equal Friction, Fittings and the Index Run
- VRF Connection Ratio: How to Select the Right Outdoor Unit
- Smoke Detector Spacing (and Heat Detectors): Practical Rules
- Cable Sizing for Voltage Drop: Formula, Limits and Worked Example
Want the full picture? Our online courses start free: modules 1–3 need no account.
Fire Protection & Suppression Systems Design (NFPA)
20 narrated modules with animated diagrams, two complete worked projects (DWG + DXF), the Fire Calc Workbook and an online calculator.
Modules 1–3 are free, no account needed · full course €15,00 one-time
HVAC Systems Design — Heating, Cooling & Ventilation
28 modules from heat loss to plant room: boilers, heat pumps, cooling loads, psychrometrics, AHUs and ductwork. The VRF course is included.
Modules 1–3 are free, no account needed · full course €15,00 one-time
Electrical Power Systems Design for Buildings
35 modules from the MV connection to the socket: transformers, short circuit, protection and selectivity, cable sizing, boards, generators, earthing, surge and lightning protection. Includes 50 % off TEKHAT.
Modules 1–3 are free, no account needed · full course €15,00 one-time