15-15-15 fertilizer typically costs $12-$25 for a 10-pound bag, $30-$60 for 50 pounds, or about $700-$1,300 per ton in bulk. Price depends on package size, whether the product is granular or specialty-coated, shipping, and local retail or farm-supply rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 5-pound bag | $8 | $12 | $18 | Small garden package |
| 10-pound bag | $12 | $18 | $25 | Home landscape use |
| 50-pound bag | $30 | $45 | $60 | Standard granular blend |
| Bulk, per ton | $700 | $950 | $1,300 | Before spreading or delivery |
What 15-15-15 fertilizer costs by bag size
A 15-15-15 blend contains 15% nitrogen, 15% phosphate, and 15% potash by weight. A 50-pound bag therefore contains 7.5 pounds of each listed nutrient, with the remaining weight made up of other ingredients. Most household buyers pay around $30-$60 for conventional granular fertilizer, while small specialty bags cost more per pound.
At typical prices, a 50-pound bag works out to about $0.60-$1.20 per pound. Bulk purchases may lower the material rate to roughly $0.35-$0.65 per pound, but delivery, minimum order size, and spreading equipment can reduce the savings. Assumptions: standard dry granular blend, U.S. retail pricing, and no delivery charge.
For ordinary granular product, $45 per 50-pound bag is a useful midpoint for budgeting.
How fertilizer material and delivery shape the quote
Bag price is only one part of the expense when a large area needs treatment. Retail prices usually include packaging and store handling; bulk quotes may list product, delivery, and application separately. Coated or slow-release formulations can cost more than standard granules, and custom blends may carry a supplier minimum.
| Quote item | Low | Average | High | Pricing basis |
|---|---|---|---|---|
| Standard fertilizer | $30 | $45 | $60 | Per 50-pound bag |
| Slow-release blend | $45 | $65 | $90 | Per 50-pound bag |
| Bulk product | $700 | $950 | $1,300 | Per ton, material only |
| Delivery | $25 | $60 | $150 | Per local order |
| Professional spreading | $0.03 | $0.07 | $0.15 | Per sq ft, including labor |
Confirm whether a quote includes delivery, spreading, and any minimum service charge before comparing totals.
Application rate and lawn size change the quantity needed
Coverage depends on the target nutrient rate, not just the bag label. Applying 1 pound of nitrogen per 1,000 square feet requires about 6.7 pounds of 15-15-15, because nitrogen accounts for 15% of the product. A 50-pound bag would cover roughly 7,500 square feet at that rate, but the appropriate rate varies by plant, soil test, and local guidance.
For example, a 5,000-square-foot lawn at that illustrative rate uses about 33 pounds, or roughly $20-$40 worth of fertilizer from a standard 50-pound bag. A 10,000-square-foot area needs about 67 pounds, typically more than one bag. For farm acreage, one ton covers about 40 acres at 50 pounds per acre, before accounting for the recommended nutrient rate.
Rates above are math examples, not a recommendation; soil conditions and plant needs determine the proper application.
Save money by matching the blend to a soil test
Buying a balanced fertilizer when soil already has enough phosphorus or potassium can add unnecessary cost and may create nutrient runoff concerns. A soil test can identify whether a 15-15-15 blend is appropriate or if a lower-cost nitrogen-only or custom analysis better fits the need. Compare the price per pound of the nutrient actually required, not only the bag price.
For larger jobs, compare the total delivered price of bulk product with the cost of multiple bags, including spreading. Store pickup can avoid a $25-$150 delivery charge, while buying only the amount needed avoids leftover product and storage issues. The least expensive blend is not a saving if its nutrient mix does not match the job.
Regional fertilizer prices vary with freight and supply
Prices in agricultural production areas may run about 5%-15% below national retail averages, particularly for bulk orders. Urban and coastal markets can be 10%-25% higher because of freight, warehouse costs, and fewer bulk suppliers. Rural buyers may find lower product prices but face higher delivery fees or minimum quantities.
Seasonal demand can also affect availability. Spring lawn and garden buying periods may bring limited stock or higher local retail prices; ordering ahead during a quieter period can improve selection. However, storage must keep fertilizer dry and secure. Compare the delivered total in the buyer’s ZIP code, not an advertised product-only rate.
DIY spreading versus professional application
A homeowner with a working broadcast spreader can apply bagged fertilizer without paying a service fee. A basic spreader may cost $40-$150 if one is not already available. Professional application commonly adds about $0.03-$0.15 per square foot, or $150-$750 for 5,000 square feet, depending on the service minimum, access, and whether the quote includes other treatments.
Labor estimates may use a minimum visit charge rather than an hourly rate. When labor is billed separately, a crew may charge around $50-$100 per hour, with the actual time depending on site size and setup. For a single small lawn, the service minimum can matter more than the fertilizer quantity.
Compare 15-15-15 with other fertilizer choices
A 15-15-15 blend offers equal percentages of its three listed nutrients, but that balance is not necessary for every lawn, garden, or crop. Common granular lawn fertilizers may cost $25-$70 per 40-50-pound bag, while specialty or controlled-release products can reach $50-$100 or more. Price comparisons should account for nutrient content, coverage, and application directions.
For gardens with a specific nutrient need, a single-nutrient product may be cheaper per pound of that nutrient, though it does not provide the other two. Liquid concentrates often cost $10-$30 per container but cover less area at label rates and may require repeat applications. Choose by soil-test needs and cost per treated area rather than by NPK numbers alone.