Finance Calculators

Interest, returns, break-even and budgeting math — free finance calculators that run privately in your browser.

Simple Interest Calculator

Principal Annual rate (%) Time (years)

Work out interest earned or owed with the simple interest formula I = P x r x t.

Amount invested Final value Years held (optional)

Measure the return on an investment, with the annualized rate when you enter the holding period.

Starting value Ending value Years

Find the compound annual growth rate of an investment between two points in time.

Fixed costs Price per unit Variable cost per unit

See how many units you must sell before a product starts making a profit.

Cost Selling price or Markup % (leave price blank)

Convert between cost, selling price, markup on cost and profit margin on price.

Goal amount Annual interest rate (%) Years to save

Find the monthly deposit needed to reach a savings target by a set date.

Monthly debt payments Gross monthly income

Compute your debt-to-income ratio, a key figure lenders review before approving credit.

Hourly rate or Annual salary Hours per week

Convert pay between hourly, weekly, monthly and annual amounts based on your working week.