financial calculators
Financial calculators
Tools to calculate interest, severance, vacation pay, taxes, and loans without needing a spreadsheet. Enter your values and get instant results, with no sign-up required and no ads hiding your answer.
All tools
Compound interest
Calculate the growth of your capital over time.
$Simple interest
Direct calculations for earnings or installments.
$Loan Simulator
Compare fixed rate and amortization payment plans side by side.
$Discount calculator
Calculate the final price after a discount and how much you save.
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Frequently Asked Questions
What is the difference between simple interest and compound interest?
In simple interest, the percentage is always applied to the initial capital. In compound interest, it is calculated on the principal plus any previously accumulated interest, creating "interest on interest" and accelerating growth over time.
How do I calculate employment severance pay?
The total amount varies based on the type of termination (without cause, resignation, mutual agreement, etc.) and includes items such as remaining salary, notice period pay, accrued vacation, and FGTS penalty. Use the severance calculator above by entering the termination type to see a full breakdown.
Do CastroTools financial calculators use updated tax and social security rates?
Yes, the Social Security and Income Tax calculators are updated according to current rate tables. However, for formal tax decisions, always confirm the figures with relevant tax authorities or an accountant.