Kingsbury, the defending World Cup champion, has been the man to beat this season with third at the second round in Kreischberg his only blemish.
The 20-year-old has been perfect elsewhere and underlined his dominance on home soil in Canada as he recorded a winning score of 80.00 to just take victory.
That was just better than Russian Alexandr Smyshlyaev's effort of 79.66 while Japan's Sho Endo completed the top three with a score of 75.60 himself.
The wins sees Kingsbury extend his lead at the top of the overall World Cup standings to 105 points over Olympic moguls champion Alexandre Bilodeau.
Bilodeau was fourth in final two in Calgary with an effort of 62.60, significantly shy of the top three, while France's Anthony Benna was fifth with 40.90.
Meanwhile in the women's moguls in Calgary Justine Dufour-Lapointe ensured it was a double celebration for Canada as she won a family battle for the win.
She beat older sister Chloe by 0.86 after recording an effort of 74.96 for her first win of the season that sees her lead the overall World Cup standings.
Justine has had to settle for second, third and sixth so far this season but finally had her moment to shine in Calgary while Eliza Outtrim of the USA was third.
Outtrim recorded a score of 71.40 for third, just beating Russia's Marika Pertakhiya who was awarded 71.00, while another Canadian Andi Naude didn't finish the second final.
Justine now leads the overall moguls World Cup standings by 75 points over early front runner Heather McPhie, who was well down in 26th in Calgary.
- Sports & Recreation