Calculator Web (calc.onl.jp)
A simple calculator web app that runs in the browser. Supports basic arithmetic operations and is easily accessible from smartphones, tablets, and PCs.
Counter Web (count.onl.jp)
A simple web counter that supports count-up and count-down with just a button press. Useful for inventory tracking, headcounts, vote tallying, and many other purposes.
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.
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.
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.
Bill Splitter (warikan.onl.jp)
A web tool to equally split dining or party expenses among multiple people. Instantly calculates the amount per person including rounding, reducing the burden on the organizer.
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.
BMI Calculator (saruwakakun.com)
A BMI calculator that takes height and weight as input and rates your result across five levels from underweight to obese. Also shows your ideal weight and the gap to reach it.
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.
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.
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.
Aspect Ratio Calculator (toolpods.io)
Calculate aspect ratios from width and height. Convert dimensions to any target size while maintaining the ratio.
