Calculator design collection

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Renovation Cost Calculator

Renovation Cost Calculator

❇️ Renova lets you calculate remodelling costs in your house, create expenses plans and find contractors to do the job. You can publish your own calculation or browse community's plans and modify them to fit your space and budget. 👨‍🎨 I'm available for projects! pierzchala.bartlomiej@gmail.com

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Diet Calculator App - Main Screens Snapshots

Diet Calculator App - Main Screens Snapshots

This application uses step by step form for user to fill the data before starting the program. We usually call it 'wizard' forms. Below the form, there's a progress bar showing the completeness of steps has been filled by users. Press L if you LIKE it :D --- We are Agensip, a creative digital agency focusing on UI and UX stuff. Kindly visit our website at www.agensip.com to see more detail about us. Never hesitate to contact us via email at agensipmail@gmail.com

Web calculators

Web calculators

As an SEO play these types of form (basically HTML) + calculation (frontend Javascript, nothing fancy really) tools are a great low eng/design effort bets. Here are two I designed for compound.

Bondspark Calculators

Bondspark Calculators

A big part of the home loan journey is understanding what you can afford and what your monthly repayments will be – being such a popular feature with banks, coming up with something innovative was rather difficult. Here's our take on a home loan calculator. ⚖️🎛 P.S Sorry had to re-upload

Loan overpayment calculator application

Loan overpayment calculator application

Hi Guys 👋 This is an update of the mobile app concept I am currently working on. Just few more screens to explore the style and colors.If you like it, press the "L" button 😍🤘

Diet Calculator App - Frequency of Training

Diet Calculator App - Frequency of Training

The next steps of main user wizard. Fill the data of frequesncy, cardio & fitness, medical diagnostic, food, and the last is user 's contact. Please see attachments for detail. Press L if you LIKE it :D --- We are Agensip, a creative digital agency focusing on UI and UX stuff. Kindly visit our website at www.agensip.com to see more detail about us. Never hesitate to contact us via email at agensipmail@gmail.com

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Why is calculator app design more challenging than it appears?

Calculators are among the most interaction-dense apps in terms of input precision per screen area — a 12-key grid on a 375px-wide screen must produce precise, reliable input with zero cognitive ambiguity about which key was pressed. The design challenge is balancing density (enough keys to be functional), clarity (enough size per key to be accurate), and feedback quality (immediate visual and haptic response that confirms input). Calculator UI also handles numerical display — a design discipline separate from key grid design.

What are the tap target and layout principles for calculator key grids?

Keys should meet the 44×44pt accessibility minimum at the absolute floor — 52–60pt is the optimal size for calculator keys used with one thumb. Visual padding within the key should be 4–8px smaller than the actual tap target, creating comfortable margin between adjacent keys. The AC/C function, decimal point, and equals key receive visual emphasis through size (equals key is typically 2x the height of standard keys) or color differentiation. Avoid purely icon-based operator keys without fallback labels — iconography varies by locale and education background.

How do you design the result display for calculator interfaces?

The result display must handle numbers across a huge range — from single digits to 12+ character scientific notation — without truncation or layout breaks. The standard approach is dynamic font scaling: the result number shrinks proportionally as digit count increases, with a minimum readable size threshold. Show the current expression directly above the large result in a smaller secondary style — this context display is critical usability, not decoration.

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