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A keypad calculator with clear, memory and percentage controls

Subject calculators and a custom calculator builder

Resize by percentage or pixel dimensions

A graphing-calculator emulator in the browser

A TI graphing-calculator emulator for classroom explanation

Everyday calculation categories with a simple keypad

Everyday calculations with topic-specific explanations

Programmable scientific arithmetic with saved formulas

Scientific, graphing, fraction and matrix calculations

Readable calculators for quick everyday tasks

Explore portfolio weights with explicit return, risk and constraint choices

A notepad calculator with variables and calendar expressions

Chrome extension that shows the probability a tweet was written by AI.

Organize dividend portfolios and compare income-growth scenarios

Fraction and percentage practice with exercises, a learning mode and answer feedback.

Standard, scientific, programmer and date calculations

Android scientific calculation with symbolic and graphical tools

A handheld-style scientific calculator for Android

Linked mathematical views for algebra, geometry and graphs

Cloud-service cost estimates with inspectable assumptions

Azure cost scenarios from selected services and usage

Free voice calculator you speak to, in the browser or on iPhone.

Formulas and notes arranged on a mathematical worksheet

Monthly cost scenarios for planned cloud workloads