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Browser tools for beam and structural calculations

RF and microwave calculations with formula references

RF design formulas from attenuation to link budgets

Brewing recipe calculation across desktop and web

Emissions estimates for travel, homes and events

Air-travel carbon estimates with a published methodology

Notes, variables and arithmetic in a browser

Symbolic expressions with documented algorithms

Matrix-based numerical calculation and visualization

Symbolic calculation through a compact command interface

Fluid-flow calculators for pipes, valves and measurements

Weather quantities with linked formulas

RF coil, antenna and related engineering calculations

Practical telescope and observing calculations

Formula-driven apps built from spreadsheet-style logic

A setlist planner and personal songbook

Telescope and camera calculations for observing setups

Airfoil comparison, plotting and geometry calculations

Geometry and structural formulas with dedicated inputs

Business formation, compliance, branding and growth tools in one platform.

Calculators for work, study and household questions

Calculators with worked steps for selected problems

German bookkeeping with project time and a digital document archive

Physical calculations with tracked units and exact quantities