Concrete Calculator

Free density calculator — solve density, mass, or volume from the other two, with unit conversions and a float-or-sink check.

Free Reynolds number calculator — laminar, transitional or turbulent, with friction factor, pressure drop and flow rate, and an animation of the flow pattern changing as you drag the velocity.

Free concrete mixer and batch calculator — volume with wastage, M15/M20/custom mix ratios broken down into cement bags, sand and gravel by weight, water from the w/c ratio, and the batch count from your mixer’s usable capacity rather than its drum size.

Calculate the volume and flow rate of a pipe.

Free impulse calculator — J = F·Δt = m·Δv, with peak force as well as average, deceleration in g, and an animated impact beside a force–time curve whose shaded area is the impulse.

Free Newton's second law calculator — F = m·a, with the acceleration in g, the time to 100 km/h, and a block that really accelerates beside a velocity–time line and a same-force-different-mass race.