Rock Tonnage Calculator | Calculate Gravel, Stone & Dirt Weight Rock Tonnage Calculator Calculate gravel, stone, and dirt weight for construction projects Length (ft) Length of the area in feet Please enter a valid length. Width (ft) Width of the area in feet Please enter a valid width. Depth (inches) Thickness of the material layer … Read more
ROA Calculator – Calculate Return on Assets ROA Calculator: Calculate Return on Assets Return on Assets (ROA) Calculator Net Income ($): Enter the company’s net income after taxes for the period. Average Total Assets ($): Enter the average total assets over the period (or beginning + ending assets / 2). Calculate ROA Reset Copy Results … Read more
Roll Diameter Calculator – Calculate Roll OD Roll Diameter Calculator Calculate the outer diameter (OD) of a roll of material based on its length, thickness, and the core’s diameter. Our Roll Diameter Calculator is quick and easy to use. Roll Calculator Core Outer Diameter (Dc) (mm): Enter the diameter of the core the material is … Read more
Radioactive Activity Calculator | Calculate Decay & Half-Life Radioactive Activity Calculator Accurately calculate the remaining radioactive activity of an isotope over time using the radioactive decay formula. Perfect for physics students, researchers, and radiation safety planning. Initial Activity (A₀) Enter the starting activity level (e.g., in Bq, Ci, or counts per minute). Please enter a … Read more
Rear End Gear Ratio Calculator – Calculate RPM & Speed Rear End Gear Ratio Calculator Enter your vehicle’s details to calculate engine RPM at a given speed or find the ideal rear end gear ratio for your setup. Our Rear End Gear Ratio Calculator is easy to use. Tire Diameter (inches): Enter the overall diameter … Read more
Mortgage Recasting Calculator: Lower Your Monthly Payments Mortgage Recasting Calculator Curious about mortgage recasting? Use our Mortgage Recasting Calculator to see how a lump-sum payment towards your principal can reduce your monthly mortgage payments without changing your loan term or interest rate. Input your current loan details and lump sum to estimate your new payment … Read more
R12 to R134a Conversion Calculator | Professional HVAC Retrofit Tool R12 to R134a Conversion Calculator Accurately determine the correct refrigerant charge weight for AC retrofits. Original R12 Factory Charge Ounces (oz)Pounds (lbs)Grams (g)Kilograms (kg) Enter the original factory charge specification found on the compressor label. Please enter a valid positive number. Ambient Temperature (°F) Current … Read more
Punnett Square Eye Color Calculator – Predict Child’s Eye Color Punnett Square Eye Color Predictor Punnett Square Eye Color Calculator Estimate the probability of your child’s eye color based on a simplified two-gene model (Brown/Blue and Green/Blue inheritance). Please note this is a simplified model; actual eye color is more complex. Parent 1 – Brown/Blue … Read more
PTO Payout Calculator: Calculate Your Unused Vacation Pay PTO Payout Calculator Estimate the payout value of your unused Paid Time Off (PTO) or vacation time upon leaving a job or at year-end, considering taxes and deductions. Accrued PTO/Vacation Hours: Enter the total number of unused PTO or vacation hours you have accumulated. Please enter a … Read more
Prop Pitch Calculator – Calculate Boat Propeller Pitch Prop Pitch Calculator Enter your boat’s engine RPM, gear ratio, desired speed, and estimated slip to calculate the required theoretical propeller pitch. Engine RPM: Engine revolutions per minute at wide open throttle (WOT) or desired cruise speed. Gear Ratio: E.g., 1.5 for a 1.5:1 ratio (engine turns … Read more