JAY Project
JAY Project
Finance

Finance Tools — Salary, FIRE, Compound Interest, Loans

From take-home salary and FIRE simulation to compound interest, dollar-cost averaging, dividend reinvestment, loan amortization, rent vs buy comparisons, car financing, and bill splitting — every money calculation you need in one place. No signup, no payment; every input stays inside your browser and is never sent to a server.

12 tools in this category

Salary Calculator
Stock Average Calculator
Compound Interest
FIRESimulator
Dividend Reinvestment Simulator
DCA Calculator
Loan Calculator
Split Bill Calculator
Savings Goal Calculator
Tax Refund Calculator
Rent vs Buy Comparison
Car Loan vs Lease

Frequently asked questions

Q. Where are my financial inputs stored?

Everything stays in your browser. Numbers are never sent to a server, and no signup is needed.

Q. What taxes does the salary calculator account for?

It subtracts the four Korean social insurances plus simplified income and local income tax to estimate take-home pay. Personal deductions and non-taxable allowances are not factored in, so treat results as a guide.

Q. How does the FIRE simulator work?

Given current assets, monthly savings, expected return, and a target net worth, it compounds forward to estimate your retirement year. Inflation and tax are simplified.

Q. Does the compound interest calculator support monthly and yearly periods?

Yes — you can switch between monthly, quarterly, and yearly compounding to compare outcomes.

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