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F0X (F-Zero-X) Finance
Free, Transparent Financial Calculators
Trusted by thousands worldwide. Every formula visible. Every data source cited. No hidden calculations.
See every formula. Verify every calculation. All data sources cited from official government agencies.
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Localized calculators for 66 countries with region-specific tax laws, currencies, and regulations.
Data from IRS, HMRC, central banks, and official sources. Updated regularly with last-verified dates.
Calculate federal income tax
Monthly payments & amortization
Retirement savings with employer match
Any loan with payment schedule
See your money grow over time
Plan and track your spending