The is an essential utility for design engineers, drafters, and quality control inspectors working with involute splines. Unlike complex 3D CAD modeling tools, these Excel spreadsheets serve as rapid-deployment tools for calculating geometry, tolerances, and inspection dimensions (span/M-pin sizes).
Most "Excel calculators" for DIN 5480 are not standard commercial software but rather custom-built workbooks or templates created by engineers to automate the geometric formulas defined in the standard. Spline Standards and Spline Calculator - FRENCO GmbH
Always verify a few manual points against the DIN 5480 Standard Tables after "installing" a new calculator to ensure the formulas (especially for the tooth thickness and profile shift) are accurate for your specific tolerance class.