Calculators
Quick computational tools for percentages, VAT, finance, etc.
Category overview
The calculator category focuses on numeric tasks that are easy to mistype when repeated by hand, including percentages, discounts, VAT, area conversion, and averages. Each tool separates input meaning from output meaning and adds notes where rates, units, or money values can be misunderstood.
The public calculator list starts with common everyday cases. For tax, investment, contracts, or other high-impact decisions, treat results as reference values and verify them against official documents or source data.
Currently showing 40 reviewed tools, including Percentage Calculator, Discount Calculator, Ratio Calculator, Pyeong Area Converter, Unit Converter.
Calculators List
- Percentage Calculator - Find what percentage a part is of a whole, or calculate a percentage of a value.
- Discount Calculator - Enter the original price and discount rate to find the final price and the amount saved.
- Ratio Calculator - Simplify the ratio of two values, or solve for the unknown in a proportion.
- Pyeong Area Converter - Convert apartment and office area between pyeong, square meters (m²), and square feet (ft²).
- Unit Converter - Freely convert units of length (nanometer to mile), weight, temperature, area, and volume.
- VAT Calculator - Calculate 10% VAT from either the supply price or the total amount.
- Average Calculator - Calculate the average, maximum, minimum, and sum of a list of numbers.
- Percentage Change Calculator - Enter a previous and current value to calculate the rate of increase or decrease.
- Goal Achievement Calculator - Enter a target and current value to see the achievement rate (%) and the amount remaining.
- Rounding Calculator - Round, round up, or round down a number to a chosen number of digits.
- Split the Bill Calculator - Enter a total amount and the number of people to calculate the amount per person.
- Margin & Cost Calculator - Calculate the margin from cost and selling price, or find the price from a target margin.
- Reverse Percentage Calculator - Work back to the original value from a result and its percentage.
- Price Increase/Decrease Calculator - Enter the current price and a change rate (%) to find the new price and the amount changed.
- Break-Even Point Calculator - Calculate the break-even quantity from fixed costs, variable costs, and selling price.
- Fee Calculator - Calculate the net amount after payment and platform fees.
- Exchange Rate Memo Calculator - Enter an exchange rate yourself to convert between local and foreign currency.
- Hourly Wage Calculator - Calculate the hourly wage from monthly salary, workdays, and work hours.
- CAGR Calculator - Calculate the compound annual growth rate from start value, end value, and period.
- ROI Calculator - Enter investment and return amounts to calculate profit, ROI, and the return multiple at once.
- PPI Calculator - Calculate pixel density (PPI) and dot pitch from screen diagonal size and resolution.
- Annual Leave Calculator - Estimate accrued annual leave days from a hire date and a reference date (simplified).
- Severance Pay Calculator - Estimate severance pay from the last three months of wages and length of service (simplified).
- Net Salary Calculator - Estimate net take-home pay from gross salary, non-taxable amount, deduction rate, and income tax.
- Percentage Point Calculator - Calculate the difference between two percentage values as percentage points and relative change.
- Compound Interest Calculator - Calculate compound results from initial amount, monthly contribution, rate, and period.
- Loan Interest Calculator - Calculate monthly payment and total interest from loan principal, rate, term, and repayment method.
- Deposit Interest Calculator - Calculate the maturity amount from deposit, rate, term, and interest tax.
- Savings Interest Calculator - Calculate the maturity amount of a regular savings plan from monthly deposit, rate, term, and tax.
- Average Cost Calculator - Calculate a new average purchase price from existing holdings and an additional buy.
- LCM Calculator - Calculate the least common multiple of two or more positive integers.
- GCD Calculator - Calculate the greatest common divisor of two or more positive integers using the Euclidean algorithm.
- Prime Number Checker - Check whether a natural number is prime and show its prime factorization when it is composite.
- Polynomial Factorizer - Factor or solve a quadratic expression ax² + bx + c using the discriminant and quadratic formula.
- Gaussian Elimination Calculator - Solve 2×2 to 5×5 systems of linear equations with Gaussian elimination.
- Fraction ↔ Decimal Converter - Convert fractions to decimals and decimals to simplified fractions.
- Modulo Calculator - Calculate a mod b and compare mathematical modulo with the JavaScript remainder operator.
- Combinatorics Calculator - Calculate permutations, combinations, repeated permutations, and multiset combinations from n and r.
- Fibonacci Calculator - Generate Fibonacci sequence values up to 100 terms and show the golden-ratio relationship.
- Confidence Interval Calculator - Calculate Z- or t-based confidence intervals from sample mean, standard deviation, and sample size.