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Plant Engineering Calculator

Updated Sep 18, 2026

Cooling Tower Chemical Dose Cost Calculator — ppm, Feed Rate & Annual Spend

Convert a target active chemical dose and makeup-water flow into product feed rate, annual product consumption and treatment cost.

Live calculationWorking shownPrivate in browser

Inputs

Results

Active chemical 0.100 kg/h
Product feed 0.250 kg/h
Annual product 1250.0 kg
Annual chemical cost $3750
Product dose 50.0 mg/L
More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Formula

active kg/h=makeup m³/h×dose mg/L/1000; product=active/active fraction.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Active demand = 5.000 m³/h × 20.000 mg/L ÷ 1000 = 0.10000 kg/h.
  2. 2.Product active fraction = 40.000% ÷ 100 = 0.40000.
  3. 3.Product feed = 0.10000 ÷ 0.40000 = 0.25000 kg/h.
  4. 4.Annual product = 0.25000 × 5000 = 1250.00 kg/year.
  5. 5.Annual chemical cost = 1250.00 × $3.000/kg = $3750.00; equivalent product dose = 50.00 mg/L.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

At 5 m³/h makeup and 20 mg/L active dose, active chemical demand is 0.10 kg/h before correcting for product strength.

Assumptions and limits

  • Dose must come from a qualified water-treatment program and site chemistry.
  • This mass-balance tool does not select biocide, corrosion inhibitor or regulatory limits.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Why divide the active chemical demand by product strength?

The ppm target refers to active ingredient. A 40% product contains only 0.40 kg active per kg product, so the required product feed is active demand ÷ 0.40.

Is mg/L numerically the same as ppm here?

For dilute water treatment solutions, mg/L is commonly used as the practical ppm mass-concentration basis. The calculator keeps the mg/L unit explicit and converts makeup flow to active kg/h by mass balance.

Can this calculator choose a cooling-tower chemical dose?

No. The dose and product strength are user inputs that must come from a qualified water-treatment program, product data and site chemistry. The calculator only converts that program into feed mass and cost.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

cooling tower water costcooling tower cyclescooling tower blowdown savings
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.