Precision Instrument

Calculator App Design Template

Tally is a calculator app design with a machined Precision Instrument look, built for founders and designers shipping a utility or conversion tool.

Use this template

Calculator app standard screen with two-line tape display and circular keypad

Calculator app scientific screen with trig, log, and power function keys

Calculator app history tape screen with past calculations and results

Explore the screens

Preview the calculator mobile app design, fully editable in Sleek.

Unit ConverterScreen 4

CurrencyScreen 5

SettingsScreen 6

About the Calculator App

Tally is a calculator app design template built around a Precision Instrument aesthetic: a dark graphite canvas, off-white monospaced digits that sit in a perfect grid, and a single warm amber reserved for operators and the equals key. Large circular keys carry a subtle raised bevel and real press-depth, so the whole interface feels like a well-machined tool rather than a flat panel.

The template ships six connected screens that form a complete utility app: a standard calculator with a two-line tape display, a scientific keypad with trig, log and power keys, a scrollable history tape, a unit converter with category tabs, a live-rate currency converter, and a settings screen for theme and haptic options. The signature two-line stack pairs a faint grey live expression above the bold result below, scrolling like a real calculation tape.

Use it in Sleek and make it yours: restyle the amber accent, edit any screen with AI by describing the change, and add the flows your product needs. Then export it to code, copy it into Figma with no plugin, or hand a prompt to an AI agent to build it for real, far faster than starting from a blank canvas.

Screens included

Standard Calculator

A two-line display stacks the grey live expression over an oversized result, sitting above a tight grid of circular keys with amber operators and a solid amber equals disc. The core calculating surface.

Scientific

The keypad expands with a panel of trig, log, power and constant keys (sin, cos, tan, log, ln, x², √, π, e), with Rad and Inv toggles. For advanced calculations beyond basic arithmetic.

History Tape

A scrollable list of past calculations, each showing the original expression in grey above its bold result, with a Clear action in the header. Tappable to reuse earlier work.

Unit Converter

Paired From and To fields with category tabs for Length, Weight, Temp and Volume, plus dropdowns to pick units and a swap button. The keypad handles input inline.

Currency

Live-rate conversion between two currencies with flags, the converted amount, a swap control, and a timestamped rate line. A Live Rates badge confirms the data is current.

Settings

Grouped controls for visual identity (active theme, display grid) and engineering options (machined haptics, mechanical clicks, decimal precision). Lets users tune the feel of the instrument.

Key features

Precision Instrument aesthetic: graphite canvas with a single amber accent
Monospaced numeric face so digits sit in a perfect grid
Two-line tape display: grey live expression over bold result
Circular keys with raised bevel and real press-depth
Amber operator and equals keys that flare on press
Scientific panel with trig, log, power and constant keys
Unit converter with category tabs and swap control
Currency screen with live-rate conversion and flags

Who it's for

Founders validating a calculator or utility app MVP

Product designers needing a calculator app UI starting point

Indie developers shipping a converter or finance tool

Utility-app teams prototyping a precision interface

What you can build

Launch an MVP for a calculator or conversion app
Mock up screens for an investor or stakeholder pitch
Hand a complete, consistent calculator UI off to developers
Explore a redesign of an existing utility app

How to use this template

1
Open the template
Browse the screens and preview the full design to see if it fits your idea.
2
Use this template
Open your own fully editable copy in Sleek with one click.
3
Edit with AI
Restyle the palette, change layouts, and add or remove screens just by describing what you want.
4
Export and ship
Export your design or hand it to developers, and keep building toward launch.

Questions, answered. Everything to know before you start.

How do I build a calculator app from this template?

Click "Use this template" to open it in Sleek as your own editable project, then shape it by describing the changes you want: restyle the amber accent, edit any screen, and add the flows your product needs. You start from six complete screens instead of a blank canvas, so you reach a working calculator app design far faster.

What screens are included in this calculator app design template?

Six connected screens: standard calculator, scientific keypad, history tape, unit converter, currency converter, and settings. Together they cover the core flow of a real utility app, from basic arithmetic to conversions and customization.

Can I customize the calculator app UI design?

Yes. Use the template in Sleek and edit any screen by chatting with the AI: restyle the palette, change the key layouts, and add or remove flows. There's no manual redraw; you describe the change and it's applied.

Can I adapt this into a BMI or specialty calculator app?

Absolutely. The two-line display, keypad, and converter screens map cleanly onto a BMI calculator app design or other specialty calculators. Adjust the inputs, labels, and result formatting to fit your niche.

Is this calculator app design template free to use?

You can open and explore the design for free, then use it in your own Sleek project to build on it. Editing and exporting follow Sleek's standard plans.

Can I export the design to code or Figma?

Yes. Sleek exports your design as code, copies straight into Figma with no plugin, or hands you a ready-made prompt that an AI agent like Claude Code or Cursor can use to build it into a real, working app.

Something else? Write to support@sleek.design.