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Engineering calculations with steps and interactive models

Natural-language calculation beside short notes

Numerical, symbolic and plotting tools for mathematical work

Portable symbolic algebra with numerical approximation

Nucleic-acid folding calculations with explicit constraints

Mexican recipes organized around ingredients and cooking basics

Home-cook recipes with curated collections and clearly identified Blue Ribbon picks

Brew-day volumes, temperatures and efficiency calculations

Practical finance, cooking and unit calculations

A catalogue of practical and specialist calculations

Focused browser calculators for statistical questions

Epidemiological calculations for surveys and test performance

Statistical power and effect-size calculation

Browser tools for beam and structural calculations

Building-services calculations with visible equations

Physics calculations with visual explanations

RF and microwave calculations with formula references

Component calculations for practical electronics

Circuit and electrical formulas grouped by task

Solar position, photovoltaic and map calculations

Location-based photovoltaic performance calculations

Audio, acoustics and electrical calculation references

Editable notes with live scientific calculations

Notes, variables and arithmetic in a browser