How It Works
This calculator works in 4 steps.
Enter the tank strength
Type the percent or ppm of the solution in the supply tank.
Measure the chemical draw
Time the draw from a graduated container and enter L/min or US GPM.
Enter the water flow
Type the water flow through the injector.
Read the final concentration
The calculator returns the injection ratio and the concentration at the outlet.
The Formula
The formula multiplies the tank strength by the chemical share of the total flow.
C_out = C_tank × Q_chem / (Q_chem + Q_water)1 : (Q_water / Q_chem)C_tank = C_target × (Q_chem + Q_water) / Q_chem- C_tank:
- Supply tank concentration
- Q_chem:
- Measured chemical draw
- Q_water:
- Water flow
- C_out:
- Concentration at the outlet
A tank of 10% cleaner drawn at 0.5 L/min into 9.5 L/min of water gives 10 × 0.5 / 10 = 0.5% at the outlet.
Conversion Table
The conversion table gives outlet concentration for 6 measured flow combinations.
| Tank strength | Chemical draw | Water flow | Injection ratio | Outlet concentration |
|---|---|---|---|---|
| 100% | 0.1 L/min | 1.9 L/min | 1:19 | 5% |
| 10% | 0.5 L/min | 9.5 L/min | 1:19 | 0.5% |
| 100% | 1 L/min | 14 L/min | 1:14 | 6.67% |
| 50% | 0.2 L/min | 7.8 L/min | 1:39 | 1.25% |
| 20% | 0.05 L/min | 3.95 L/min | 1:79 | 0.25% |
| 100% | 0.3 L/min | 11.7 L/min | 1:39 | 2.5% |
What Is the Chemical Injector Dilution Calculator?
The Chemical Injector Dilution Calculator is a tool that returns the final chemical concentration in a water line from the injector's draw rate, the water flow rate, and the strength of the solution in the supply tank. Venturi injectors and proportioning pumps both follow this flow-ratio model.
Injector draw changes with water pressure, hose length, and metering tip size. The calculator uses a measured draw, found by drawing from a graduated container for a set time, rather than a nominal tip rating. Results are flow-weighted, so a draw of 0.5 L/min into 9.5 L/min of water gives a 1:19 mix.
Common Uses
There are 5 main uses of this calculator.
Pressure washers
Operators set downstream injector mixes.
Wall-mount dispensers
Facility teams verify proportioner output.
Irrigation fertigation
Growers set fertilizer injectors such as 1:100 proportioners.
Livestock water lines
Farm staff verify medicator output per product directions.
Car washes
Operators verify chemical arch dilutions.