National Physical Laboratory, India: Tryst with Metrology and the Metre Convention

The year 2025 marks 150 years of the Metre Convention, an intergovernmental treaty that transformed global cooperation in measurement science and technology. Signed in 1875 by seventeen nations, the Convention created a shared foundation for accuracy in trade, industry, and research. This feature article examines India’s growing integration into this international framework, tracing its historical progress from metrication to active involvement in global metrological institutions. CSIR-National Physical Laboratory (CSIR-NPL), India’s National Metrology Institute (NMI), is steadily progressing towards the vision of Viksit Bharat, a developed and self-reliant India. The article emphasises the country’s longstanding dedication to developing a strong and forward-looking metrology system, vital for achieving scientific excellence, industrial innovation, effective policy-making, and sustainable economic growth. India’s journey in metrology is not just about adoption but also about emerging leadership in shaping the future of global measurement standards.