About this calculator
Primality test with smallest divisor and next prime, up to 10¹².
/Math & Daily
Other Math & Daily Tools
175 availableLoan & Credit Calculator
Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.
Mortgage Loan Calculator
Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.
Compound Interest Calculator
Visualize compound growth with recurring deposits, annual rate, and investment horizons.
VAT & Sales Tax Calculator
Add or extract Value Added Tax (VAT) with international country presets.
Return on Investment (ROI)
Analyze profitability and percentage return on business capital and investments.
Salary / Paycheck Calculator
Gross to net salary with income tax, social contributions and deductions, monthly and annual.