Business & Financial Calculators
Invoices, quotations, tax, discounts, loan amortisation, ROI, break-even and NPV/IRR. Every figure is decimal arithmetic with a stated rounding mode, returned in the response so you can reproduce it exactly.
Invoice Calculator
Computes invoice line totals, per-line and document discounts, configurable tax and the grand total using exact decimal arithmetic with a stated rounding policy.
Quotation Calculator
Builds a quotation with cost, margin or markup pricing per line, optional validity period and full decimal totals.
Configurable Tax Calculator
Applies caller-defined tax rules — inclusive or exclusive, compound or parallel, per-line or document level — showing each rule's contribution.
Discount Calculator
Applies sequential or parallel percentage and fixed discounts, returning the effective discount rate and the order of application.
Unit Converter
Converts across length, mass, volume, area, temperature, pressure, energy, power, speed, time and data units with exact factors.
FX Conversion
Converts between currencies using European Central Bank daily reference rates, returning the provider, rate date, retrieval time and a staleness warning.
Loan Amortization
Generates a full amortisation schedule with per-period principal, interest and balance, supporting extra payments and several compounding conventions.
ROI Calculator
Computes simple ROI, annualised ROI and CAGR from cash flows with the holding period stated.
Break-Even Analysis
Computes break-even units and revenue, contribution margin, margin of safety and operating leverage.
NPV & IRR
Computes NPV, IRR, MIRR, payback and discounted payback from a cash-flow series, using bracketed bisection so IRR either converges or says it did not.