Stone Calculator

To calculate how much stone you need, use our free YesMeasure Stone Calculator. Enter your project's Length, Width, and desired Depth (usually 2″ for walkways, 3″ for patios, or 4″ for driveways). The calculator converts your surface area into exact volume in cubic yards, weight in short tons (or metric tonnes), and 50-lb retail bag counts.

For crushed stone (#57 or 2B limestone/granite), multiply your surface area in square feet by depth in feet (depth in inches ÷ 12) to determine cubic feet, then divide by 27 for cubic yards. Multiply cubic yards by 1.40 tons/yd³ and add a 10% compaction buffer. For example, a 20×10 ft patio base at 3 inches depth requires approx. 1.85 cubic yards or 2.6 tons of crushed stone.

Our free stone calculator calculates both bulk aggregate volume (cubic yards/meters) and physical weight (tons/tonnes/lbs). It also includes pre-set calculations for flagstone patio slabs (yields approx. 80–90 sq ft per ton at 1.5″ thickness) and cobblestone border edging.

To determine how many 50-lb retail bags of stone you need: Calculate total cubic feet (Square Feet × Depth in inches ÷ 12) and divide by 0.5 (since standard 50-lb bags hold approx. 0.5 cubic feet of stone). Add 10% for settling. For example, a 100 sq ft garden bed at 2 inches deep requires approx. 34 to 37 fifty-pound bags.

Pea stone (3/8-inch rounded river pebble) has a bulk density of approx. 1.35 tons per cubic yard (2,700 lbs/yd³). For walkways and casual patios, a 2 to 3-inch depth is recommended. A 25×4 ft path (100 sq ft) at 2 inches depth requires approx. 0.62 cubic yards, which equals about 0.84 tons or roughly 34 fifty-pound bags.

For #57 stone (3/4-inch clean crushed aggregate), plan for 1.40 tons per cubic yard (2,800 lbs/yd³). A standard 30×10 ft driveway (300 sq ft) at 4 inches depth requires approx. 3.7 cubic yards × 1.40 × 1.10 (compaction) = 5.7 tons of #57 stone.

To calculate cubic yards of stone: Multiply Length (ft) × Width (ft) × Depth (in) and divide the result by 324 (since 27 cubic feet × 12 inches/foot = 324). For example: a 20 ft by 10 ft driveway at 4 inches deep is (20 × 10 × 4) ÷ 324 = 2.47 cubic yards (or approx. 2.7 cu yds with 10% compaction).

In the British imperial system commonly used by the NHS and UK fitness trackers, 1 stone equals exactly 14 pounds (6.35 kg). To calculate weight lost in stone: subtract your current weight from your starting weight in pounds, then divide the lost pounds by 14. For example, losing 28 lbs equals 2 stone lost (28 ÷ 14 = 2 st). While our tool calculates aggregate landscaping stone (where 1 short ton = 2,000 lbs), 1 ton of stone equals approx. 142.86 British stones.

To convert pounds lost into stones: divide the total pounds lost by 14. For example, if you lost 21 lbs, you have lost 1 stone and 7 pounds (1.5 stone). In metric, 1 stone equals 6.35029 kilograms. Note that in hardscaping and construction, stone weight is measured in short tons (2,000 lbs) or metric tonnes (1,000 kg).

To find total tons: Calculate your volume in cubic yards (Length × Width × Depth in inches ÷ 324), multiply by your stone's density factor (1.40 for #57 crushed stone, 1.35 for pea gravel, or 1.45 for crusher run), and multiply by 1.10 for compaction. Our calculator automatically runs this formula and displays both tons and cubic yards instantly.