Free Online Calculators & Converters

Fast, free, no-signup calculators for finance, business, and everyday math. Get an answer in one click. 3 tools and counting — no signup, no paywall, results as you type.

Business & Freelance

Freelance Hourly Rate CalculatorWork out the hourly rate you need to charge to hit your target take-home income, after taxes, business expenses, unpaid time, and non-billable hours.

E-commerce

Amazon FBA Fee CalculatorCalculate Amazon FBA fees, net profit, margin, and ROI for any product. Enter your price and cost to see referral fees, fulfillment fees, and your real take-home per unit.

Math & Everyday

Percentage Increase CalculatorFind the percentage increase or decrease between two numbers instantly. Shows the percent change, the absolute difference, and the multiplier, with the formula worked out step by step.