Latest posts
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Root Calculator
Find the square root, cube root or any n-th root of a number.
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Roofing Calculator
Enter your roof footprint and pitch to estimate the roof area, squares and shingle bundles needed.
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Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers, from 1 to 3999.
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ROI Calculator
Enter the amount invested and the final value to get your return on investment as a percentage, plus annualized ROI.
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Right Triangle Calculator
Enter the two legs of a right triangle to get the hypotenuse, both angles, area and perimeter.
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Resistor Color Code Calculator
Convert 4-band resistor colors into resistance and tolerance.
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Repayment Calculator
Work out the monthly repayment and total interest on a loan.
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Rental Property Calculator
Estimate monthly cash flow, cap rate and cash-on-cash return for a rental property.
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Rent vs. Buy Calculator
Compare the monthly cost of renting against owning a home — mortgage, tax, insurance and upkeep.
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Rent Calculator
Estimate an affordable monthly rent from your income, using the 30% rule.