Observed arrival · 2026-09-16
A Calculator That Refuses to Stop at the Answer
A free suite of 35 calculators for math, finance, grades, paychecks, dates, graphing, health, and everyday decisions.
Field notes
The suite organizes its calculators by practical context rather than presenting one undifferentiated form: finance includes compound interest, taxes, refunds, savings, and markups, while grades cover GPA, weighted grades, AP, SAT, and ACT scoring. Its compound-interest example accepts an initial balance, annual rate, term, and monthly contribution, then displays both the final amount and interest earned. The page states that completed answers can be exported as links, images, PDFs, or formula-bearing Excel sheets.
Observed signals
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Editorial observations of this landing page, not a rating.
One card from the complete issue