Welcome to OpenCalculators

Your one-stop solution for all calculation needs. Simple, accurate, and free to use.

Popular Categories

Financial calculators for loans, investments, business metrics, and budgeting

Tools for construction, engineering calculations, and material estimations

Kitchen conversions, recipe scaling, and nutritional calculations

Health metrics, fitness tracking, and wellness calculations

Academic calculations, statistical tools, and research metrics

Tech conversions, network calculations, and IT metrics

Daily life calculations, utilities, and personal planning tools

Environmental impact and energy consumption calculations

Sports statistics, game scoring, and recreational metrics

Gaming statistics, entertainment metrics, and scoring calculators

Travel planning, navigation, and distance calculations

Convert liters to fluid ounces (fl oz), with support for both US and UK measurements.

Convert gallons to fluid ounces (fl oz) with support for both US and UK measurements.

Convert cups to fluid ounces (fl oz) with support for both US and UK measurements.

Calculate the duration between two times. Perfect for tracking time intervals, work hours, or event durations.

Calculate your monthly mortgage payments based on home price, down payment, interest rate, and loan term.

Calculate FHA loan payments including mortgage insurance premiums (MIP) based on home price and down payment.