Free Calculators

Free Field Tools

Chiller & HVAC Field Calculators

Fast answers for technicians. One question. One calculator. One answer. No login required.

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Five fast tools for common field questions.

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Water Flow (GPM)

Estimate actual water flow from design and measured pressure drop.

Water Side→
↔

Unit Conversions

Convert common HVAC and field measurement units.

Field Tools→
N₂

Pressure Testing

Correct nitrogen pressure and evaluate vacuum decay.

Field Tools→
WB

Wet Bulb

Estimate ambient wet bulb from dry bulb and relative humidity.

Cooling Tower→
Ω

Ohm’s Law & Power

Calculate volts, amps, resistance, and power.

Electrical→
The Next Layer

Chiller Performance Snapshot

You already collect the readings. This turns one inspection into estimated flow, load, efficiency, and cooling-tower context—so the readings become a performance snapshot instead of just another inspection.

Build My Snapshot →
Most inspections end as paperwork. Turn yours into insight. Turn one inspection into nine calculated results and a clear picture of how the chiller was operating that day.

Browse by Category

Find the calculator that matches the field task.

Chiller Performance

Water Flow (GPM) → Evaporator Tons → Condenser Tons → kW / Ton → Evaporator Approach → Condenser Approach →

Cooling Tower

Wet Bulb → Cooling Tower Performance →

Electrical

Ohm’s Law & Power → Three-Phase kW → Current Imbalance → VFD to Motor RPM → Transformer VA / Control Circuit Amps →

Field Tools

Unit Conversions → Pressure Testing → Chiller Head Weight → How Big Is This Chiller? →

Need More Than Today’s Answer?

The free calculators solve today’s field question. Chiller Trend saves the readings and calculations so mechanics can compare inspections and see what changed.

See How Chiller Trend Works →