How much does 1 tonne of gravel cover:A ton of gravel and crushed stone yield around cubic yard or cubic feet volume, 1 cubic feet is represented by 1 foot length by 1 foot wide by 1 feet thickness, assuming 1 feet thickness, then cover area in a tonne or ton of gravel = /1= approx 19 square feet, therefore a tonne or ton of gravel covers around 20 square foot for 1 foot ...