Free Online Calculators

Calculates the child waist-to-height ratio using waist circumference and height measurements.

Hull speed is the theoretical maximum speed of a displacement hull based on its waterline length. The calculator multiplies the square root of the boat's waterline length (in feet) by a coefficient (commonly 1.34).

Calculate the new weighted average cost per share after purchasing additional shares at a different price.

Calculate the total basal area of a group of trees based on trunk diameter (DBH) and number of trees.

Calculates the internal volume of a cylindrical pipe in liters using inner diameter and pipe length.

Estimate the total cost of building a house based on total floor area and construction cost per square foot.