Monthly Budget

📖 Tool Introduction

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Monthly Budget is a completely free, instant-use personal bookkeeping and budget management tool designed for everyday income and expense tracking as well as month-end financial review. You can quickly log each transaction, pick a matching category, enter the amount and an optional note, and the system automatically tallies your total income, total spending and remaining balance, then renders a horizontal bar chart showing how each expense category shares the total. Every record is stored locally in your browser and never sent to any server, so your financial privacy is fully protected. The interface switches between Simplified Chinese, Traditional Chinese and English, follows the website theme colours and corner-radius style automatically, and runs smoothly on both desktop and mobile devices. Whether you are an office worker tracking daily costs, a student managing living expenses, or a household reviewing the month, this tool helps you see clearly where the money goes, how much budget is left, and build healthier spending habits over time. No sign-up, no installation, no account — just open the page and start recording right away.

Many people find that writing expenses down in a simple table changes how they spend money throughout the month, because every purchase becomes a conscious decision rather than an automatic swipe. This tool is designed to be quick enough to open on your phone, add a coffee in two taps, and close again before your drink has cooled. It does not require any account sign-up, bank connection, or cloud sync, which means your financial data never leaves your device. The simple breakdown also makes it easy to spot patterns such as how much you spend on dining out versus groceries, or whether your transport costs are creeping up. Once a category starts to dominate the bar chart, you know exactly where to focus next month.

✨ Key Features

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• Two-way ledger: switch between expense and income modes with one tap, covering salary, bonus and investment sources
• Ten preset categories: food, transport, housing, entertainment, shopping, medical and more for faster, more accurate entries
• Real-time balance: income minus expenses, with a red warning the moment you go over budget
• Expense breakdown bars: categories sorted by amount, showing each share of total spending at a glance
• Editable history: every row shows category, note and amount, and the × button deletes any single entry
• Local persistence: data lives in browser localStorage, so reopening the page keeps everything intact

📝 How to Use

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1. Choose Expense or Income at the top of the form
2. Select the matching category from the dropdown list
3. Type the amount in the amount field and add a brief note if you like
4. Click the Add Entry button to save the record and refresh all statistics
5. Read the summary cards and the breakdown bars to understand your budget situation

⚠️ Notes

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• Valid amounts only: the amount must be a non-negative number; empty or malformed input triggers a friendly warning
• Local storage limit: records live in the current browser only, and clearing browser cache will remove them
• Balance meaning: balance equals total income minus total expense; a negative value means you have overspent this month
• Breakdown scope: the bar chart covers expense categories only, and income does not appear in the breakdown
• Fully offline: every calculation runs in your browser with no network request at all, so it works even without internet