UPS engineering calculators
Free, anonymous, mobile-friendly calculators for UPS dealers and system integrators worldwide. Backed by IEC 60364, IEEE 1188, and major OEM datasheets.
Battery Replacement Date Estimator
Predict when a UPS battery will need replacement based on temperature, chemistry, and duty cycle.
UPS Battery Runtime Calculator
Calculate runtime in minutes from load, battery capacity, voltage, and chemistry. WPC and Peukert methods.
UPS Sizing Calculator
Convert your equipment load list to the right UPS kVA rating with growth allowance and motor inrush.
Cost of Downtime Calculator
Estimate the real cost of an outage — productivity, revenue, recovery — with Ponemon / ITIC / Uptime benchmarks.
Generator + UPS Compatibility Checker
Right-size a backup generator for your UPS, accounting for rectifier topology, step load, and site derating.
UPS PM Frequency Recommender
Generate an IEEE / NFPA 70B-aligned preventive-maintenance schedule by site criticality, battery chemistry, and age.
Cable Sizing Calculator
IEC 60364-5-52 cable sizing with ampacity + voltage-drop dual constraint and regional ambient defaults.
UPS TCO Calculator
5-yr total cost of ownership: CapEx + power loss + maintenance + battery refresh, discounted to NPV.
UPS Room HVAC + Ventilation Sizing
Cooling capacity for UPS + battery heat load, plus IEC 62485 hydrogen-venting check for lead-acid.
Generator Fuel Autonomy
Diesel BSFC curve + altitude / temperature derating + NFPA 110 24-hour rule check for life-safety installs.
Harmonic Distortion / IEEE 519 Quick Check
Verify a UPS install against IEEE 519-2022 current distortion limits at the PCC.
Three-Phase Imbalance
Voltage / current imbalance check vs ANSI / IEC thresholds, plus NEMA MG-1 motor derating factor.
Battery Shipping Classification
UN number, IATA Section, packing instruction, and documentation list for shipping UPS replacement batteries.
All thirteen Power Stack engineering calculators are now live. Tell us what to build next at george@power-stack.io.