This study explores the impact of artificial intelligence (AI) tools on the development of grammar proficiency among Bachelor of Secondary Education (BSEd) English students at Davao Central College. Utilizing a quantitative-correlational research design, the research investigates the relationship between AI tool usage—measured by frequency, purpose, and perceived effectiveness—and grammar proficiency, evaluated through sentence structure, correct usage, grammar rules, and punctuation. Data collected from 200 second- and third-year students revealed a significant moderate positive relationship (r=0.522, p=0.000) between AI utilization and grammar proficiency, with correct usage showing the strongest correlation. The findings highlight the transformative potential of AI tools like Grammarly, Quillbot, and ChatGPT in enhancing students’ linguistic capabilities by providing real-time feedback and iterative improvements. While AI tools positively influenced grammar mastery, gaps remain in punctuation proficiency, underscoring the need for targeted training and optimized AI functionalities. This research contributes to the growing body of literature on AI in education, offering actionable recommendations for educators, institutions, and students to integrate AI effectively into grammar instruction. By fostering independent learning and skill development, AI tools demonstrate their value as supplements to traditional teaching methods, paving the way for future advancements in English language education.