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Engineering calculations with steps and interactive models

Personal emissions estimates with quick and detailed inputs

Create quizzes, polls, surveys, forms, assessments, and calculators.

UK home-energy research with calculators and regional tools

Arithmetic, finance and practical calculation worksheets

Formula calculators with selectable input units

Construction and everyday calculations with searchable tasks

A catalogue of practical and specialist calculations

Subject calculators and a custom calculator builder

A searchable catalogue of calculations and conversions

A keypad calculator with clear, memory and percentage controls

Statistical tests, power analysis and descriptive tools

Focused browser calculators for statistical questions

Construction layouts, cut templates and dimension calculators

Circuit and electrical formulas grouped by task

Geographic area, distance and travel-time map calculations

Emissions estimates for travel, homes and events

Fluid-flow calculators for pipes, valves and measurements

Practical telescope and observing calculations

Formula-driven apps built from spreadsheet-style logic

Custom estimate forms with formulas and conditional fields

Structural language properties in a comparative database

Telescope and camera calculations for observing setups

Render, inspect, extract, and restructure PDFs from a terminal