Power Tower Calculator
Calculate finite power towers with right- or left-grouped powers, plus a base-10 logarithm for values too large to display.
Sam Gorman
Monthly Solar Energy Calculator by Location
Estimate month-by-month energy from a horizontal solar array using historical sunlight data for your location.
Logarithmic Expression and Equation Calculator
Evaluate a logarithm containing x, or solve for x when the expression inside the logarithm is linear.
Light Bulb Buying Calculator
Find a brightness target for replacement bulbs, whether you are matching an old bulb or lighting a room with existing fixtures.
Pounds and Ounces Weight Adder
Add a list of weights in pounds and ounces to find the combined total, including repeated items.
Reaction Conversion, Selectivity, Yield and Loss Calculator
Calculate reaction yield and split a limiting-reactant charge into desired product, unreacted material, side-product diversion, and recovery loss.
Solvent Recovery Yield, Recycle Savings and Payback Calculator
Estimate recovered solvent, annual net savings, remaining residue cost, and simple payback for an on-site solvent recycler.
Bioreactor Oxygen Transfer Rate, OUR and kLa Capacity Calculator
Calculate bioreactor OTR, compare it with OUR, and find the kLa or dissolved oxygen needed to meet oxygen demand.
Fermentation Titer, Yield and Batch Revenue Calculator
Calculate gross product, substrate yield, volumetric productivity, sellable product after recovery, and gross revenue for a fermentation batch.
Cathodic Protection Anode Mass Calculator
Calculate cathodic protection current, sacrificial anode mass, installed-mass life, and the gap against your target design life.