Sales Tax Calculator (saruwakakun.com)
A consumption tax calculator that computes the tax-inclusive price and tax amount from a pre-tax price. Supports the standard 10% rate and the reduced 8% rate for food and periodicals.
Real Estate Valuation Web (land.onl.jp)
A web tool to check an estimated real estate valuation for condos and houses by entering address, age, and size. Useful for understanding market prices when selling or buying property.
Random Number Generator (www.piliapp.com)
An online random number generator. Set a minimum and maximum value, choose how many numbers to generate, and get instant random results for games, draws, or decisions.
PX / Rem Calculator (web-toolbox.dev)
Free tool for converting between PX and rem. Enter the base font size to quickly convert units during CSS layout design, also useful for planning accessible font sizes.
Price per 100g Comparison Tool (saruwakakun.com)
A unit price comparison tool that calculates the cost per 100g for multiple products and highlights the best deal. Handy for comparing different sizes or refill vs. regular packs at the supermarket.
Percentage Calculator (www.piliapp.com)
An online percentage calculator for quick percent computations. Calculate what percentage one number is of another, find percent increase or decrease, and more.
Percentage / PX Calculator (web-toolbox.dev)
Free tool for converting between percentages and PX. Enter the parent element size to quickly convert units during CSS layout design.
Mortgage Calculator Web (loan.onl.jp)
A mortgage simulation web tool that calculates monthly repayments, total repayment amount, and total interest from loan amount, interest rate, and repayment period. Helpful for planning home purchases.
Gas Cost Calculator (saruwakakun.com)
A fuel cost calculator that estimates the gasoline expense for a drive based on fuel price, travel distance, and fuel efficiency. Includes tips on finding each value.
Fraction Calculator (lazesoftware.com)
Performs arithmetic operations (addition, subtraction, multiplication, division) on fractions. Accepts integers, decimals, fractions, and mixed numbers, allowing different input formats to be combined in a single calculation.
FIRE Calculator (fire.onl.jp)
A web tool to calculate the assets and time needed to achieve FIRE (Financial Independence, Retire Early) by entering current assets, monthly cash flow, and target amount. Simulations based on the 4% rule.
Discount Price Calculator (saruwakakun.com)
A discount price calculator that instantly computes the final price from the original price and a discount rate. Save multiple results to check the total discounted amount.
