Foam Concentrate Calculator

Calculator inputs

The page uses a single-column layout, while the input fields switch between 3, 2, and 1 columns responsively.

Protected Area (m²)

Application Rate (L/min/m²)

Discharge Duration (min)

Foam Concentrate (%)

Discharge Devices

Safety Factor (%)

Concentrate Tank Capacity (L)

Concentrate Density (kg/L)

Cost per Liter

Reset

Plotly graph

The graph below shows cumulative solution and concentrate demand across the discharge duration. It uses your latest calculation when available, otherwise the example case.

Example data table

This example demonstrates a typical engineering estimate for a foam system planning case.

Area (m²)	Rate (L/min/m²)	Duration (min)	Foam (%)	Devices	Safety (%)	Tank (L)	Density (kg/L)	Cost/L
450.00	6.50	20.00	3.00	4	10.00	2,200.00	1.03	4.20

Solution Flow (L/min)	Adjusted Solution (L)	Concentrate (L)	Water (L)	Mass (kg)	Tank Runtime (min)	Refill Needed (L)	Estimated Cost
2,925.00	64,350.00	1,930.50	62,419.50	1,988.42	25.07	0.00	8,108.10

Formula used

1) Solution flow rate

Solution Flow Rate (L/min) = Protected Area × Application Rate

2) Base solution volume

Base Solution Volume (L) = Solution Flow Rate × Discharge Duration

3) Adjusted solution volume

Adjusted Solution Volume (L) = Base Solution Volume × (1 + Safety Factor ÷ 100)

4) Foam concentrate volume

Concentrate Volume (L) = Adjusted Solution Volume × (Foam Percentage ÷ 100)

5) Water volume

Water Volume (L) = Adjusted Solution Volume − Concentrate Volume

6) Concentrate flow rate and tank runtime

Concentrate Flow Rate (L/min) = Solution Flow Rate × (Foam Percentage ÷ 100)

Tank Runtime (min) = Tank Capacity ÷ Concentrate Flow Rate

7) Concentrate mass and cost

Concentrate Mass (kg) = Concentrate Volume × Density

Estimated Cost = Concentrate Volume × Cost per Liter

Use compatible units throughout. This tool assumes density in kg/L, area in square meters, and application rate in liters per minute per square meter.

How to use this calculator

Enter the total protected area that requires foam coverage.
Provide the application rate required by your hazard and discharge method.
Enter the design discharge duration in minutes.
Choose the foam concentrate percentage, such as 1%, 3%, or 6%.
Add the number of discharge devices to estimate per-device solution flow.
Apply a safety factor if you want reserve capacity above the base requirement.
Enter concentrate tank capacity, density, and cost data for storage and budgeting checks.
Click the calculate button to show results above the form, generate the graph, and enable CSV and PDF downloads.

Frequently asked questions

1) What does the foam concentrate percentage mean?

It is the mixing ratio of concentrate within the finished foam solution. A 3% foam means 3 liters of concentrate are mixed into every 100 liters of final foam solution.

2) Why is application rate important?

Application rate defines how much finished solution must be delivered over each square meter every minute. It directly drives total flow demand and heavily affects concentrate storage sizing.

3) Why add a safety factor?

A safety factor provides extra volume above the theoretical minimum. Engineers often use it to cover uncertainties, hose losses, future system changes, or operational margins during emergency response.

4) Does tank runtime use total solution flow?

No. Tank runtime is based on concentrate consumption, not full solution demand. The calculator divides the concentrate tank capacity by concentrate flow rate to estimate available operating time.

5) Can I use this for AFFF, AR-AFFF, or synthetic foam?

Yes, as a planning estimate. Enter the correct concentrate percentage, density, and cost for your product. Final design should still confirm compatibility with equipment and applicable standards.

6) What does per-device flow tell me?

Per-device flow divides total solution flow by the number of discharge devices. It helps with balancing hose lines, monitors, chambers, or nozzles during preliminary hydraulic planning.

7) Why calculate concentrate mass?

Mass is useful for storage handling, transport checks, and structural loading. Since many suppliers state physical properties by density, converting liters into kilograms is often practical.

8) Is this calculator enough for a final design package?

No. It is an engineering estimation tool. Final designs should verify hazard classification, code criteria, device performance, proportioner selection, hydraulics, storage arrangements, and acceptance test requirements.