Bag Coverage Calculator

Find out how much area a bag of grass seed covers. Select your bag size and grass type to see coverage in ft², m², and acres.

Bag Coverage Calculator
Coverage

Select a bag size and grass type to see how much area it covers.

How Much Area Does a Bag of Grass Seed Cover?

A bag of grass seed covers a specific area based on its weight and the grass type’s seeding rate. The formula is straightforward:

coverage (ft²) = bag weight (lbs) ÷ seeding rate (lbs per 1,000 ft²) × 1,000
Example: How much will 20kg of grass seed cover with Kentucky Bluegrass?
20 kg = 44.09 lbs. Rate = 3.5 lbs/1,000 ft².
44.09 ÷ 3.5 × 1,000 = 12,597 ft² (1,170 m²) for new lawn
For overseeding at 50% rate: 25,194 ft² (2,340 m²)
Example: How much will a 50 lb bag of grass seed cover with Tall Fescue?
Rate = 9 lbs/1,000 ft².
50 ÷ 9 × 1,000 = 5,556 ft² (516 m²) for new lawn

Coverage by Bag Size and Grass Type

The table below shows new-lawn coverage for common bag sizes across popular grass types.

Grass Type5 lbs10 lbs20 kg (44 lbs)25 lbs50 lbs
Tall Fescue556 ft²1,111 ft²4,899 ft²2,778 ft²5,556 ft²
Bahia Grass588 ft²1,176 ft²5,187 ft²2,941 ft²5,882 ft²
Perennial Ryegrass667 ft²1,333 ft²5,879 ft²3,333 ft²6,667 ft²
Fine Fescue1,000 ft²2,000 ft²8,818 ft²5,000 ft²10,000 ft²
Buffalo Grass1,250 ft²2,500 ft²11,023 ft²6,250 ft²12,500 ft²
Kentucky Bluegrass1,429 ft²2,857 ft²12,597 ft²7,143 ft²14,286 ft²
Bermuda Grass1,429 ft²2,857 ft²12,597 ft²7,143 ft²14,286 ft²
Zoysia Grass2,500 ft²5,000 ft²22,045 ft²12,500 ft²25,000 ft²
Centipede Grass3,333 ft²6,667 ft²29,393 ft²16,667 ft²33,333 ft²

All values are for new lawn seeding at 100% rate. For overseeding, double the coverage area (50% seeding rate).

How Many Bags of Grass Seed Do I Need?

Divide your total lawn area by the coverage of a single bag to find how many bags you need.

bags needed = lawn area (ft²) ÷ coverage per bag (ft²)

Always round up to the nearest whole bag. You cannot buy partial bags at retail, and leftover seed stores well in a cool, dry location for up to 2–3 years.

Example: A 10,000 ft² new lawn with Kentucky Bluegrass using 25 lb bags:
Coverage per bag = 7,143 ft². Bags needed = 10,000 ÷ 7,143 = 1.4 → 2 bags (50 lbs total)

Use the reverse calculator in the tool above — enter your total lawn area in the “How many bags for this area?” field to get instant results.

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Bag Coverage FAQ

Answers about grass seed bag sizes and coverage area.

20 kg (44.09 lbs) covers 4,899–29,393 ft² depending on grass type. For Kentucky Bluegrass: 12,597 ft² (1,170 m²) new lawn or 25,194 ft² (2,340 m²) overseeding. For Tall Fescue: 4,899 ft² (455 m²) new lawn. Select “20 kg” in the 20kg grass seed coverage calculator above for your specific grass type.

A 50 lb bag covers 5,556–33,333 ft² depending on grass type. Tall Fescue (highest rate) covers 5,556 ft² (516 m²). Centipede Grass (lowest rate) covers 33,333 ft² (3,097 m²). Enter “50 lbs” in the calculator above to see results for your grass type.

For 1 acre (43,560 ft²) with 25 lb bags: Tall Fescue: 16 bags (392 lbs). Kentucky Bluegrass: 7 bags (153 lbs). Bermuda Grass: 7 bags (153 lbs). Enter 43560 in the “How many bags for this area” field above for your grass type.

Common retail sizes are 3, 5, 7, and 10 lbs. Commercial bags come in 25 and 50 lbs. Metric bags are typically 1, 5, 10, and 20 kg. The weight is printed on the bag label. If using a non-standard size, select “Custom weight” in the calculator.

Yes. Bulk bags (25–50 lbs) cost $1.50–$3.00 per pound compared to $3.00–$6.00 per pound for small retail packages. Buying 2–3 large bags saves 30–50% per pound. Leftover seed stores for 2–3 years in a cool, dry location in a sealed container.