How to calculate it yourself
Truck capacity in tons ÷ ~1 ton per yard = cubic yards delivered. A standard 5-yard dump truck holds 5–7 tons of topsoil depending on moisture.
Common scenarios
Lawn topdress, 1,000 ft² at ½ in deep
42 ft³ ÷ 27 = 1.5 yd³ of topsoil ≈ 1.5 tons (3,000 lbs). One small delivery covers it.
4×8 raised garden bed, 12 in deep
32 ft³ ÷ 27 = 1.2 yd³ ≈ 1.2 tons (2,400 lbs). Buy 2 yd³ to top it off after settling.
New lawn over 5,000 ft² at 4 in deep
61.7 yd³ × 1.1 = ~68 tons. That is 4–5 dump truck loads. Spread and grade in stages so you do not get rained out.