변호사 계산기: 소송·기한·기간·이자·상속·인지대·송달

⚖️ Professional Lawyer Calculator for Legal Practitioners

This calculator allows you to accurately process complex formulas frequently used in the field, adhering to practical standards. Designed for lawyers, judicial assistants, court officials, law firm staff, and law school students, it enables you to complete complex calculations with just a few touches and paste them for immediate use.

📅 Litigation Deadline Calculator - Strict Application of Articles 157 and 161 of the Civil Code

It prevents the most critical errors in calculating immutable periods and deadlines in litigation practice.

Forward Calculation (Calculation of End Date Based on Start Date)

It is used to calculate the deadline for submitting a response from the date of filing the complaint, or to determine the expiration date of the appeal period from the date of service of the judgment. Simply enter the start date and the period (in days, weeks, months, or years), and it automatically calculates the accurate end date.

Reverse Calculation (Start Date Calculated Based on End Date)

This is a powerful feature for tasks requiring reverse calculation of deadlines. It is useful for tracing back the start date of a contract or the deadline for filing an appeal from a specific expiration date or a scheduled judgment date.

Principle of Excluding First Day and Holiday Postponement System

We have accurately implemented the principle of excluding the first day under Article 157 of the Civil Act. Furthermore, if the last day of a period falls on a Saturday, Sunday, or a statutory holiday (including substitute holidays), the end date is automatically postponed to the next business day in accordance with Article 161 of the Civil Act, maximizing practical stability.

Real-time Period Adjustment and Unit Selection

You can quickly increase or decrease the number of days by pressing the +/- buttons without having to open the calendar screen every time. You can freely switch between period units to display only days, week+day, month+day, year+month+day, and more, depending on your practical needs.

💰 Stamp Duty & Service Fee Calculator - Rates by Court Level and Electronic Filing Discounts

Complete the costs for civil litigation and other matters, in accordance with the Stamp Duty Act and the Rules on Service Fees, with just a single input of the Claim Amount.

Automatic Calculation of Range Rates

Once you enter the value of the subject matter of the lawsuit (claim amount), the system automatically determines the range-specific formulas and rates based on the stamp duty regulations for civil filing documents to derive the accurate stamp duty amount.

Multipliers by Court Level and 10% Discount for Electronic Filing

It supports not only the calculation of basic stamp duty for the first instance but also the processing of multipliers by court level, such as the Appellate Court (1.5x) and the Supreme Court (2x). Furthermore, it accurately calculates the 10% stamp duty discount applicable when filing electronically, adhering to the rules for truncation of decimal places.

💵 Interest and Late Payment Penalty Calculator - Full Support for Multiple Interest Rate Ranges

We provide a comprehensive guide to calculating late payment penalties, which are the most complex calculations in monetary claim cases such as loans, damages, and unjust enrichment.

Multiple Interest Rate Range Expansion Function

We fully support the calculation of late payment penalties across multiple ranges, where interest rates fluctuate significantly over time due to factors such as interest rate changes before and after the service of a duplicate copy of the complaint or changes in statutory interest rates under the Special Act on the Promotion of Litigation, etc. (SOC). Through the range addition function, you can easily expand the input of interest rates and calculation formulas by period.

Statutory Interest Rate Presets Provided

Presets are provided for Civil (5% per annum), Commercial (6% per annum), and SOC (12% per annum), allowing you to set the base interest rate with a single touch. Additionally, the principal amount can be precisely entered up to 12 digits (trillion won).

Dual Calculation Methods and Transparent Formula Display

It supports both the standard period calculation method (excluding the first day) and the daily pro-rata method based on 365 days per year, which is used in the financial sector. Detailed calculation formulas and total amounts for each period are clearly specified at the bottom so that they can be directly referenced in documents submitted to the court.

📉 Lost Earnings Calculator - Control of Case Law Upper Limits and Deduction Options

It strictly adheres to the standards of practicing courts when calculating damages for loss of earning capacity.

Simultaneous Equipping with Hoffmann and Leibniz Coefficients

It includes built-in monthly coefficients for the Hoffmann formula (simple interest) and the Leibniz formula (compound interest) used in practice, allowing for selective application.

Mandatory Application of the Hoffman Coefficient 240 Cap

Based on Supreme Court precedents, a cap restriction rule is strictly enforced to ensure that the total sum of Hoffman coefficients, after deducting intermediate interest, cannot exceed 240 in order to prevent overpayment. You can also easily control whether to deduct 1/3 of living expenses using a toggle function.

⚖️ Repayment Allocation Calculator - Implementation of Statutory Allocation Order under Article 479 of the Civil Code

When partial repayment is made in a situation where the debt amount is insufficient, the final remaining principal and interest are calculated by accurately determining the repayment amount deduction procedure in accordance with Article 479 of the Civil Code (Order of Allocation for Expenses, Interest, and Principal), ensuring that the balance remaining after interest allocation is sequentially absorbed into the principal.

👨‍👩‍👧‍👦 Inheritance Tax and Statutory Inheritance Share Calculator - Perfect Support for Family Law Practice

Automatically calculates statutory inheritance shares and legal reserve shares under the Civil Act based on a real-time family tree.

Automatic Determination of Rank Based on Heir Composition

By adjusting the presence of a spouse and the number of lineal descendants, lineal ascendants, and siblings, the system automatically determines the order of inheritance in real-time according to Articles 1000 and 1001 of the Civil Act. In cases where a lower-ranking heir is excluded from inheritance, the input field is automatically disabled to structurally prevent errors.

Calculation of Statutory Inheritance Share and Legal Reserve Share

It applies the principle of adding 1.5 times the spouse's share and equal distribution of shares of the same rank pursuant to Article 1009 of the Civil Act, and also supports a function to reflect contributions pursuant to Article 1008-2 of the Civil Act to calculate the modified inheritance share. In addition, it simultaneously calculates the statutory reserved portion (Article 1112 of the Civil Act) for each heir, which forms the basis of a lawsuit for the return of the reserved portion.

🎂 Age Calculator - Supports Civil, Criminal, and Administrative Reference Dates

By entering your date of birth and reference date, it calculates your exact age in detail, down to the year, month, and day. It also intuitively guides you on whether you have reached key ages that serve as turning points for legal effect, such as the age of criminal minor (14 years old) which is the standard for the application of the Juvenile Act, the age of adulthood capable of independent legal acts (19 years old), and the age of senior welfare standards (65 years old).

✨ Professional Infrastructure and Perfect User Experience

Intuitive Card Grid Layout Home

Instead of a complex bottom tab structure, the home screen is organized in a card format that allows you to view a total of 8 types of legal calculators at a glance. Touching the star icon on a frequently used calculator card pins it to a dedicated favorites area at the top of the home screen, allowing for immediate access.

Copy and Share Written Document Optimization Results

After the calculation is complete, pressing the copy button saves the result to the clipboard in an organized Markdown format, allowing it to be neatly pasted directly into complaints, preparatory briefs, and opinions.

Manage Recent 30 Automatic Save History

History of results copied or shared is automatically saved to the device for up to the last 30 instances. You can review past calculation history at any time, and unnecessary records can be deleted by simply swiping sideways.

System Persistence Dark Mode and Haptic Toggle

It supports a complete dark mode to minimize eye strain at night. Additionally, the delicate vibration feedback delivered to your fingertips when pressing buttons or changing dates can be turned on or off in the settings screen.

Specify Legal Basis and Focus on Practical Figure Management

At the bottom of each calculation screen, the legal basis—such as the Civil Act, Stamp Duty Act, and Act on the Promotion of Litigation—which forms the legal framework of the calculation, along with practical precautions, are displayed.

🎯 Highly Recommended for the following users

* Lawyers: Calculating multiple penalty brackets for delay damages before drafting the claim, estimating the division of inherited property and legal reserve claims, and calculating practical figures immediately during client consultations

* Family Litigation Representatives: Budgeting for court filing fees and service fees before filing civil applications and family cases, and accurately calculating statutory deadlines under procedural law regarding registration or deposits

* Court Officials and Law Firm Staff: Assisting with case filing verification, verifying expiration dates for deadlines and immutable deadlines, and cross-checking for errors in formulas regarding amounts within submitted documents

* Law School Students: Studying for the Bar Exam's record-based subjects and case studies, and comparing formulas against court practice standards during mock trials

* Note: This app is a tool for practical assistance. Before submitting actual documents, any subject-of-change matters must be verified against relevant laws and regulations.