DEV Community: qauay

How I Built a Simple Percentage Calculator for Everyday Calculations

qauay — Fri, 22 May 2026 17:33:12 +0000

Percentages are one of those things people use almost every day without thinking much about them.

We calculate:

discounts while shopping
exam scores
tax/VAT
profit and loss
percentage increase/decrease
financial comparisons

But surprisingly, many people still struggle with percentage formulas, especially when dealing with increases and decreases.

So I decided to build a simple percentage calculator tool focused on making these calculations easier and faster.

Common Percentage Formula

The standard formula most people learn is:

Percentage = (Part ÷ Total) × 100

Example:

If you scored 45 out of 60:

(45 ÷ 60) × 100 = 75%

Percentage Increase Example

This is another area where users often get confused.

Formula:

(New Value − Old Value) ÷ Old Value × 100

Example:

Price changes from 80 to 100:

(100 − 80) ÷ 80 × 100 = 25% increase

Why I Built the Tool

The main goal was simplicity.

Most calculator websites are overloaded with ads or unnecessary complexity, so I wanted to create something lightweight and easy to use for:

students
office workers
budgeting
quick daily calculations

I also focused on:

mobile usability
fast loading
clean interface
easy-to-understand examples

Interesting Observation

One thing I noticed while building this project is how often percentage calculations appear in real-world situations compared to other math concepts.

Even basic activities like:

shopping sales
salary comparisons
investment growth
calorie tracking

all rely heavily on percentages.

The Tool

If anyone wants to test it or give feedback, here’s the calculator:
https://calculpourcentages.com/
Calcul Pourcentage

I’d also be interested in hearing:

what math utilities people use most often
whether simple utility websites are still useful today
and what features would improve a percentage calculator further.

Starbucks Menu 2026: Full Drink List, Prices & Seasonal Specials

qauay — Thu, 19 Mar 2026 11:35:47 +0000

Starbucks continues to be a favorite destination for coffee enthusiasts and casual drinkers alike. With a wide selection of beverages, from classic hot coffees to refreshing cold drinks, navigating the menu can sometimes feel overwhelming—especially when new seasonal items are introduced.

For those who like to plan ahead, having access to a complete and updated menu is essential. Starbucks offers a variety of options: hot coffees such as cappuccinos, lattes, and americanos; cold drinks like iced coffee, frappuccinos, and refreshers; plus teas, snacks, and seasonal specialties. Prices vary depending on location and size, which makes a comprehensive guide even more useful.

If you want to explore the full menu, compare prices, and discover new drinks before your next visit, this resource is incredibly helpful:

Starbucks drinks menu

This guide provides all the information you need in an easy-to-navigate format. It’s perfect for anyone who wants to save time, try new flavors, or make informed choices when ordering. Whether you’re a daily Starbucks visitor or just stopping by for a seasonal special, this guide will enhance your experience and help you find your perfect drink.

Stay updated, explore new favorites, and enjoy your Starbucks journey!

Automating the Boring Stuff — Beyond Cron Jobs with Python 🐍

qauay — Thu, 26 Jun 2025 07:48:54 +0000

If you're still relying on cron for your backend workflows… it’s time to upgrade.

In one of my recent projects, I built an async-compatible task runner that completely replaced traditional cron logic. Inspired by the limitations I kept hitting with system schedulers, I built a modular runner that now powers dozens of my automated jobs — from SEO link drops to data fetching scripts.

🛠️ Why I Ditched Cron:
Hard to debug failures

No native retry logic

Difficult to manage across servers

Zero visibility into what's working and what’s silently failing

💡 My Solution:
I created a lightweight job orchestrator using:

FastAPI for control endpoints

ThreadPoolExecutor for concurrency

Simple YAML-based task definitions

Optional webhook triggers for external events

The whole thing runs under the hood of a larger project called Delta Executor, which also handles off-page SEO workflows and structured link automation.

✅ What I Gained:
Logs, metrics, and job history

Dynamic control (pause/resume/kill)

One tool for everything: API pings, sitemaps, link indexing, etc.

If anyone’s building automation systems and tired of cron spaghetti, I’d love to hear how you’re solving it. And if you’re interested, I can open-source a minimal version of this task runner.