Free Online Calculators
Choose the calculation that matches the decision you need to make. Each calculator asks for the inputs used in its formula and returns a result you can inspect or copy. Business and financial results are estimates because real fees, taxes, contract terms, and rounding rules can differ.
Price and business math
Profit Margin Calculator separates margin from markup, Break-Even Calculator estimates the units needed to cover costs, and Commission Calculator applies a percentage to sales. Sales Tax Calculator adds a simple percentage tax to a price. Compare the inputs with your actual business terms before using the numbers.
Time, size, and proportions
Time Duration Calculator measures elapsed hours and minutes between local date-times. Aspect Ratio Calculator reduces pixel dimensions to a ratio, while Data Size Converter distinguishes decimal storage units from binary units. Unit Converter covers common physical measurements.
Planning estimates
Simple Interest Calculator uses principal, annual rate, and years without compounding. Loan Calculator estimates fixed monthly payments, Savings Calculator projects deposits with compound growth, and Percentage Calculator handles quick percentage questions. Review assumptions before making a financial decision.
These calculators are quick estimates. Confirm financial, tax, and contract details with the relevant provider or qualified professional when the result matters.