Fast, focused calculators
Free online calculators.
Clear answers, fast.
Nineteen free calculators for debt, interest, investing, pricing, tax, savings, health and everyday calculations, with clear formulas.
No sign-upTransparent mathPrivate by design
Quick percentage
What is X% of Y?
of
Answer3615% × 240
Nineteen practical tools
Pick a calculation
Each calculator explains its inputs, formula and result.
Finance & money
Credit card payoffEstimate payoff time and interest from a fixed monthly payment, with a downloadable schedule.→Simple interestCalculate interest without compounding, using years, months or a chosen day-count basis.→Present valueDiscount a future lump sum and optional equal annual payments to today’s value.→Profit margin & markupCompare margin with markup, or find a selling price from a target percentage.→Break-even pointFind the whole sales units needed to cover costs and test profit at a planned volume.→Sales tax & VATAdd a chosen tax rate to a net price or extract tax from an inclusive price.→Loan repaymentMonthly payments, interest and an amortization schedule with extra repayments.→MortgageEstimate loan payments and a housing budget including taxes, insurance and fees.→Investment ROICompare total return, net profit and an equivalent annualized return.→Inflation & buying powerEstimate future costs and the purchasing power of a fixed amount.→InterestCompound growth with monthly contributions and a yearly schedule.→Savings goalFind the monthly amount needed to reach a savings target.→APYConvert nominal interest rates and effective annual yield.→Gross payConvert annual, monthly, weekly and hourly gross pay without tax or payroll assumptions.→
Health & nutrition
Everyday calculations
Built for the task
The answer comes first.
Inputs and results stay at the top. Below them, you’ll find the formula, examples, assumptions and related tools—enough context to understand the answer without slowing you down.