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Algebra and calculus through dedicated solvers

Math and electrical calculations in a compact tool directory

Mathematics and practical calculators by subject

Construction and everyday calculations with searchable tasks

Scientific calculation with RPN and programmable functions

Statistical power and effect-size calculation

Focused statistics tools for research calculations

Construction layouts, cut templates and dimension calculators

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