About this calculator
pH = −log₁₀[H⁺] with pOH and acidic/neutral/basic verdict.
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.
pH, pOH and acidity from H+ concentration.
pH = −log₁₀[H⁺] with pOH and acidic/neutral/basic verdict.
0–14 at 25 °C: below 7 acidic, 7 neutral, above 7 basic.
Always 14 in water at room temperature.
Tenfold concentration change — the scale is logarithmic.