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Universal Tools

Calculators that work everywhere, independent of local laws or regulations

Compound Interest Calculator

Calculate compound interest with growth visualization chart

Convert between Buddhist Era (BE) and Christian Era (CE) years

Calculate investment returns including dividends and capital growth

Calculate return on investment for any business or investment project

Track your assets and liabilities. Data saved locally in your browser.

Create professional invoices for free. Export to PDF. No signup.

Calculate gross margin, net margin, and markup percentage

Calculate your business break-even point in units and revenue

Calculate selling price from cost and desired markup percentage

Calculate Customer Acquisition Cost and Lifetime Value ratio

Calculate how much to save monthly or how long to reach your savings goal

Calculate final price after discount. Supports stacked discounts and tax.

Convert salary between annual, monthly, biweekly, weekly, daily, and hourly rates