21 free tools
Calculators
Clear calculators that show how the answer is worked out. Plan a loan, check a discount, track your GPA or split a bill, with results that update as you type.
Every tool runs in your browser. Files stay on your device; results can be saved straight into your free workstand.
Money
Loans, interest, salary, tax, discounts and returns.
Loan & EMI CalculatorMonthly EMI, total interest and schedule.Mortgage CalculatorMonthly home payment with taxes and insurance.Compound Interest CalculatorSee how savings grow over time.SIP CalculatorFuture value of a monthly investment.Salary CalculatorConvert hourly, monthly and yearly pay.GST / VAT / Sales TaxAdd or remove GST, VAT or sales tax.Discount CalculatorSale price after one or more discounts.Tip CalculatorTip amount and bill split per person.Profit Margin CalculatorMargin, markup and selling price.ROI CalculatorReturn on investment, annualized.
School and maths
Percentages, fractions, averages and grades.
Percentage CalculatorPercent of, percent change and difference.Scientific CalculatorTrig, logs, powers, roots and history.Fraction CalculatorFractions and mixed numbers, simplified.Average CalculatorMean, median, mode and standard deviation.GPA CalculatorSemester and cumulative GPA.Grade CalculatorWeighted grade and what you need on the final.
Health, dates and time
BMI, calories, age, dates and hours worked.
Questions about calculators
Is it really free?
Yes. There is no sign-up, no watermark, no daily limit and no paid plan. openWorkstand is paid for by a few ads on its public pages.
Are the results accurate?
The calculators use standard formulas, which are shown on each page. Financial results are estimates: lenders may round differently or add fees, so check important numbers with your bank.