Enter the total weight (lbs) and the total gallons (gal) into the PPM from Gallons Calculator. The calculator will evaluate the PPM from Gallons. 

Gallons to PPM Calculator

Gallons to PPM
Dose Needed
Dilution (C1V1)

Enter any 2 values to calculate the missing variable

PPM from Gallons Formula

The following two example problems outline the steps and information needed to calculate the PPM from Gallons.

PPM = W/G * 119826.427

Variables:

  • PPM is the PPM from Gallons (parts per million)
  • W is the total weight (lbs) 
  • G is the total gallons (gal) 

To calculate PPM from gallons, divide the weight by the gallons, then multiply by 119826.427.

US Gallons to PPM Increase per 1 lb or 1 kg of Solute (1 ppm = 1 mg/L)
Gallons (US) PPM per 1 lb PPM per 1 kg
523,965.352,834.4
1011,982.626,417.2
254,793.110,566.9
303,994.28,805.7
402,995.76,604.3
502,396.55,283.4
552,178.74,803.1
751,597.73,522.3
1001,198.32,641.7
150798.81,761.1
200599.11,320.9
250479.31,056.7
275435.6960.6
300399.4880.6
500239.7528.3
750159.8352.2
1,000119.8264.2
2,00059.9132.1
5,00024.052.8
10,00012.026.4
* Rounded to 1 decimal. Uses 1 lb = 453,592 mg and 1 gal = 3.78541 L. PPM ≡ mg/L. Formulas: ppm per lb = 453,592 ÷ (gal × 3.78541); ppm per kg = 1,000,000 ÷ (gal × 3.78541).

How to Calculate PPM from Gallons?

The following steps outline how to calculate the PPM from Gallons.

  1. First, determine the total weight (lbs). 
  2. Next, determine the total gallons (gal). 
  3. Next, gather the formula from above = PPM = W/G * 119826.427.
  4. Finally, calculate the PPM from Gallons.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total weight (lbs) = 5

total gallons (gal) = 50

PPM = W/G * 119826.427 = ?