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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

Research options in a browser or build on licensed historical datasets

Telescope and camera calculations for observing setups

Engineering calculations across circuits and mechanics

Civil and structural calculation tools in one collection

Maths worksheets, printable classroom tools, charts and calculators.

WordPress forms, polls, quizzes, and connected submission workflows

Quiz funnels with answer variables and fallback text for missing values

Runtime FinOps that meters, budgets, routes and charges back every model call.

Technical data and calculations for engineering study

Everyday calculations with topic-specific explanations

Subject-aware problem solving with worked steps

Algebra entry with solving, factoring and graphing modes

A notepad that calculates alongside written working

Standard, scientific, programmer and date calculations

Engineering worksheets that mix formulas and explanation

Mathematical worksheets with natural notation and units

Scientific expressions with variables and numerical calculus

A notepad calculator with variables and calendar expressions

Current-limiting resistor calculations for LED arrays