Energy & Sustainability calculator

Chiller Energy Cost Calculator

Chiller energy cost quantifies what process and comfort cooling actually costs over a billing period, and how that breaks down per unit of product, batch, or cooling ton served. Plant engineers and energy managers in plastics, food and beverage, pharma, and metalworking lean on it because chillers are often the single largest electrical load in the building and run thousands of hours a year. Knowing total cost is useful; knowing cost per served unit ($0.07 in the example) lets you compare lines, justify a variable-speed retrofit, or allocate cooling fairly to the products that need it. It turns a vague 'the chiller is expensive' into an allocable, defensible number.

What this calculator does

  • Estimate chiller electricity cost from average chiller demand, runtime, electricity rate, and cooling output basis.
  • a facilities or energy manager needs to estimate cooling electricity cost
  • It computes chiller electricity used (average demand times runtime), the total cost at your blended rate, and the cost spread across the units, batches, or cooling tons served.

Formula used

  • Chiller electricity used = average chiller electrical demand × chiller runtime
  • Total chiller electricity cost = chiller electricity used × blended electricity rate
  • Chiller cost per served unit = total chiller electricity cost ÷ cooling tons, batches, or units served

Inputs explained

  • Average chiller electrical demand:
  • Chiller runtime:
  • Blended electricity rate:
  • Cooling tons, batches, or units served:

How to use the result

  • Use it for monthly energy budgeting, per-unit cost allocation, or building the business case for a chiller efficiency upgrade.
  • It uses average demand, so it misses peak-demand charges and how part-load efficiency (kW/ton) shifts as ambient and load change; for demand-charge analysis you need interval data.

Current U.S. benchmarks

  • As of Apr 2026, industrial electricity averages 8.7 cents per kWh across the U.S. (EIA), up 5.5% from a year earlier. State averages range widely, so plants should confirm against their own tariff.

Common questions

  • How do you calculate chiller energy cost? Multiply average chiller demand (kW) by runtime (hr) to get kWh, then multiply by your blended rate ($/kWh). At 420 kW for 240 hr and $0.13/kWh that is 100,800 kWh costing $13,104.
  • What is chiller cost per unit served? Divide total chiller electricity cost by the number of units, batches, or cooling tons served. In the example, $13,104 over 185,000 units is about $0.0708 per unit.
  • How much does it cost to run a chiller per hour? Divide total cost by runtime. Here $13,104 over 240 hours is $54.60 per runtime hour, which also equals average demand times rate (420 kW x $0.13).
  • Does this include demand charges? No. This is energy (kWh) cost only. Many industrial bills add a demand charge based on peak kW, so a chiller that spikes load can cost more than this energy figure implies.
  • What is a good kW per ton for a chiller? Efficient water-cooled centrifugal chillers run around 0.5 to 0.65 kW/ton at full load; air-cooled units are often 1.0 to 1.4 kW/ton. Lower kW/ton directly lowers the average demand input here.

Last reviewed 2026-05-12.