Free tools · 13 calculators

UPS engineering calculators

Free, anonymous, mobile-friendly calculators for UPS dealers and system integrators worldwide. Backed by IEC 60364, IEEE 1188, IEEE 519, NFPA 110 and major OEM datasheets. No account needed.

Battery

Battery Replacement Date Estimator

Predict when a UPS battery will need replacement based on temperature, chemistry, and duty cycle.

BatteryOpen calculator

UPS Battery Runtime Calculator

Calculate runtime in minutes from load, battery capacity, voltage, and chemistry. WPC and Peukert methods.

BatteryOpen calculator

Sizing

UPS Sizing Calculator

Convert your equipment load list to the right UPS kVA rating with growth allowance and motor inrush.

SizingOpen calculator

Power distribution

Cable Sizing Calculator

IEC 60364-5-52 cable sizing with ampacity + voltage-drop dual constraint and regional ambient defaults.

Power distributionOpen calculator

Power quality

Harmonic Distortion · IEEE 519 Quick Check

Verify a UPS install against IEEE 519-2022 current distortion limits at the PCC.

Power qualityOpen calculator

Three-Phase Imbalance

Voltage / current imbalance check vs ANSI / IEC thresholds, plus NEMA MG-1 motor derating factor.

Power qualityOpen calculator

Generator

Generator + UPS Compatibility Checker

Right-size a backup generator for your UPS, accounting for rectifier topology, step load, and site derating.

GeneratorOpen calculator

Generator Fuel Autonomy

Diesel BSFC curve + altitude / temperature derating + NFPA 110 Class and 133 % tank check.

GeneratorOpen calculator

UPS room

UPS Room HVAC + Ventilation Sizing

Cooling capacity for UPS + battery heat load, plus IEC 62485-2 hydrogen-venting airflow for lead-acid.

UPS roomOpen calculator

Maintenance

UPS PM Frequency Recommender

Generate an IEEE / NFPA 70B-aligned preventive-maintenance schedule by site criticality, battery chemistry, and age.

MaintenanceOpen calculator

Business case

Cost of Downtime Calculator

Estimate the real cost of an outage — productivity, revenue, recovery — with Ponemon / ITIC / Uptime benchmarks.

Business caseOpen calculator

UPS TCO Calculator

5-yr total cost of ownership: CapEx + power loss + maintenance + battery refresh, discounted to NPV.

Business caseOpen calculator

Logistics

Battery Shipping Classification

UN number, IATA Section, packing instruction, and documentation list for shipping UPS replacement batteries.

LogisticsOpen calculator

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