from tkinter import *

window = Tk()

def convert_kg():
    print(e1_value.get())
    grams = float(e1_value.get())*1000
    t1.delete("1.0",END)
    t1.insert(END,grams)
    pounds = float(e1_value.get())*2.20462
    t2.delete("1.0",END)
    t2.insert(END,pounds)
    ounces = float(e1_value.get())*35.274
    t3.delete("1.0",END)
    t3.insert(END,ounces)


b1 = Button(window,text= "Convert",command =convert_kg)
b1.grid(row=0,column=2)
txt = Label(window,text='Kg')
txt.grid(row=0,column=0)
e1_value =StringVar()
e1 = Entry(window,textvariable=e1_value)
e1.grid(row=0,column=1)

t1 = Text(window,height =1,width =20)
t1.grid(row=1,column=0)

t2 = Text(window,height =1,width =20)
t2.grid(row=1,column=1)

t3 = Text(window,height =1,width =20)
t3.grid(row=1,column=2)

window.mainloop()