Useful answers.
Understand the working.
Calculators and worksheets for the subjects you study and the problems you meet in practice. Work through an example, try your own values, then test the same ideas in exam practice.
Building energy intensity calculator
Combine annual delivered fuel energy on a common basis before dividing by gross floor area. Explain the difference between site EUI and a source-energy or weather-normalised benchmark.
Open tool →FREE TOOLLighting retrofit calculator
Screen a fixture replacement using actual fixture input and a consistent service schedule. Keep driver or ballast consumption inside the power boundary.
Open tool →FREE TOOLPump and fan operating cost comparison
Compare measured electrical inputs for a building-services upgrade. Document whether both operating points deliver equivalent service before interpreting the estimated annual difference.
Open tool →FREE TOOLRoom airflow calculator
Convert a documented facility design ACH target into a flow requirement. The calculation makes the target visible without claiming it satisfies an occupancy-specific ventilation standard.
Open tool →FREE TOOLMaintenance schedule builder
Turn manufacturer or facility-programme intervals into a printable equipment schedule. Keep the source of each interval attached to the task so dates can be audited later.
Open tool →Tools that connect the calculation to the concept
Each tool shows its method, units and assumptions, together with two worked examples. Example values are for learning; replace them with your own measurements or documented inputs. The related study links take you to the matching certification topic on Facility Cert Exam.
Worksheets run in your browser. We do not send entered measurements or report text to a calculation service. Where export is available, you choose when to save the file locally.
Check the boundary of the answer
A useful result starts with the right inputs and an appropriate method. These tools explain what is calculated and what the method leaves out. User-supplied criteria remain identified as supplied criteria; a calculation does not automatically approve equipment, certify an inspection or establish regulatory compliance.