Use Callie for the everyday totals and checks that happen all day.
Scientific
Scientific calculator app for everyday math
Use Callie for quick arithmetic, then switch into Scientific mode when you need trigonometry, logarithms, exponents, roots, constants, and memory controls.
Callie keeps Basic and Scientific modes in one calm calculator workspace, so the app stays useful for quick totals, deeper checks, schoolwork, work, and everyday number problems.
Why keep Callie installed
Why keep Callie installed
Callie earns its place by keeping everyday math, scientific checks, money tools, dates, unit conversion, percentages, and currency conversion together in one calm workspace.
Reach trig, logs, powers, roots, π, and e without switching apps.
Use MC, MR, M+, and M- for multi-step calculations.
Callie keeps scientific math close to money tools, conversions, percentages, and dates.
Callie Pro for iPad
Need graphing, CAS, or Python? Meet Callie Pro for iPad.
Move from graphing and Temporal Mode to symbolic algebra, local Python, Complex 3D, matrices, statistics, constants, and exports in one focused iPad workspace.
$12.99 one-time purchase in the U.S. App Store.
FAQ
Scientific Calculator FAQ
Callie includes trigonometry, square root, square, reciprocal, logarithm, natural logarithm, exponents, π, e, percent, sign toggle, and memory controls.
Callie opens to the main calculator by default. You can switch between Basic and Scientific modes.
Callie keeps scientific tools beside everyday math, currency conversion, unit conversion, date tools, and money helpers in one app.
More Callie guides
Keep the next tool close.
Download Callie
Download Callie for everyday math
Callie keeps calculator work, scientific mode, currency conversion, money tools, unit conversion, percentage math, and date tools together in one calm workspace.