GSM Converter

About This Tool

This tool converts grams per square meter (GSM) values into related material specifications and US basis weights, and it estimates paper thickness from GSM using a material density. It accepts a GSM value, a density (default 1.0 g/cm³), and a target unit to produce precise, auditable results suitable for specification sheets and procurement work. Conceptually, GSM represents mass per unit area; converting to ounces per square yard provides a US-based weight reference, while thickness estimates rely on density to relate mass to physical thickness. The tool supports typical paper densities and allows per-stock density inputs for accurate modeling across different stocks. Core value lies in reducing manual calculations, enabling quick comparisons between papers, and supporting documentation with consistent units and rounding rules. Use cases include pre-press material selection, packaging spec sheets, and supplier comparisons. Unique value comes from combining multiple related conversions in a single workflow with explicit handling of missing or invalid inputs and clear output units. Core features include: (1) GSM ↔ oz/yd² conversion, (2) thickness estimation via density, (3) multiple output unit options, and (4) straightforward input validation. This makes it suitable for printers, packaging engineers, paper traders, and cataloguers who need reliable material specifications without performing separate calculators.

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