Enter the target plant population (p/m^2) and the TGW (thousand gram weight) (g) into the Seed Rate Calculator. The calculator will evaluate the Seed Rate. 

Seed Rate Formula

The following two example problems outline the steps and information needed to calculate the Seed Rate.

SER = TPP * TWG * 100
  • Where SER is the Seed Rate (kg/ha)
  • TPP is the target plant population (p/m^2) 
  • TWG is the TGW (thousand gram weight) (g) 

To calculate the seed rate, multiply the target plant population the thousand-gram weight, then multiply by 100.

How to Calculate Seed Rate?

The following example problems outline how to calculate Seed Rate.

Example Problem #1:

  1. First, determine the target plant population (p/m^2).
    • The target plant population (p/m^2) is given as: 30.
  2. Next, determine the TGW (thousand gram weight) (g).
    • The TGW (thousand gram weight) (g) is provided as: 60.
  3. Finally, calculate the Seed Rate using the equation above: 

SER = TPP * TWG * 100

The values provided above are inserted into the equation below and computed.

SER = 30 * 60 * 100 = 180,000 (kg/ha)

Example Problem #2: 

For this problem, the variables required are provided below:

target plant population (p/m^2) = 50

TGW (thousand gram weight) (g) = 100

Test your knowledge using the equation and check your answer with the calculator..

SER = TPP * TWG * 100 = ?