About this calculator
Solve V = I·R for the missing quantity and always get power P = V·I.
Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.
Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.
Visualize compound growth with recurring deposits, annual rate, and investment horizons.
Add or extract Value Added Tax (VAT) with international country presets.
Analyze profitability and percentage return on business capital and investments.
Gross to net salary with income tax, social contributions and deductions, monthly and annual.
Voltage, current, resistance and power.
Solve V = I·R for the missing quantity and always get power P = V·I.
Cover the unknown in V over I·R: V = I·R, I = V/R, R = V/I.
P = V·I in watts — heat and light a resistor actually delivers.
Near-zero R means huge I: fuses and breakers exist for that.