Find the correct spreader setting for any granular fertilizer, grass seed, or lime product — for drop spreaders, broadcast/rotary spreaders, and hand-held spreaders. Includes calibration guide and settings lookup tables for Scotts, Earthway, Agri-Fab, and more.
Manufacturer-recommended settings for the most popular fertilizer products on common spreader brands. Always confirm with current product label — formulations change.
| Product | Setting | Coverage/bag |
|---|---|---|
| Scotts Turf Builder 32-0-10 (48 lb) | 5¾ | 15,000 sq ft |
| Scotts WinterGuard 32-0-10 (48 lb) | 5¾ | 15,000 sq ft |
| Scotts Starter 24-25-4 (14 lb) | 4½ | 5,000 sq ft |
| Milorganite 6-4-0 (32 lb) | 8 | 2,500 sq ft |
| The Andersons 16-0-8 (40 lb) | 7 | 6,400 sq ft |
| Lesco 24-2-11 (50 lb) | 6 | 12,000 sq ft |
| Pennington Ultragreen 30-0-4 (14 lb) | 5 | 5,000 sq ft |
| Espoma Organic (18 lb) | 9 | 3,000 sq ft |
| Jonathan Green Green-Up (15 lb) | 6 | 5,000 sq ft |
| Pelletized Lime (40 lb) | 8 | 5,000 sq ft |
| Crabgrass Preventer (Dimension, 18 lb) | 3¾ | 5,000 sq ft |
| Tall Fescue Seed (5 lb) | 15 (full) | ~500 sq ft new lawn |
| Product | Setting | Notes |
|---|---|---|
| Standard granular fertilizer (4 lbs/1k) | 12–14 | Verify with calibration |
| Milorganite (16 lbs/1k) | 17–18 | Heavy rate — 2 passes |
| Pelletized lime (5 lbs/1k) | 14–16 | Water in after |
| Crabgrass preventer (3.5 lbs/1k) | 10–12 | Check label setting |
| Fine grass seed | 8–10 | KBG, bermuda |
| Coarse grass seed | 14–16 | Fescue, rye |
| Product | Setting | Notes |
|---|---|---|
| Scotts Turf Builder 32-0-10 | 4 | Single pass |
| Milorganite 6-4-0 (32 lb) | 7½ | Single pass |
| Pelletized Lime | 6–7 | Single pass |
| Scotts Crabgrass Preventer | 3 | Single pass |
| Tall Fescue Seed (overseeding) | 10–12 | 2 perpendicular passes |
| Kentucky Bluegrass Seed | 3–4 | Very fine seed |
Product falls directly through holes in the bottom of the hopper onto a 18–24" wide strip below. Excellent edge precision — product stays exactly where you walk. Requires more passes and careful overlap (50% wheel-to-wheel). Best for small-medium lawns, near beds and driveways, or when applying chemicals where drift matters. Most common: Scotts Classic Drop (20" width).
Spinning impeller throws product in a 6–12 ft swath. Covers large areas quickly — 3–4× fewer passes than drop spreader. Good distribution uniformity. Less precise at edges — use EdgeGuard feature or turn off near flower beds, water, and sidewalks. Best for medium-large lawns (2,000+ sq ft). Most common: Scotts EdgeGuard DLX, Earthway 2150.
Crank-operated handheld spreader. Covers 3–5 ft swath. Good for small lawns under 1,000 sq ft, spot treatments, and touch-up areas. Very difficult to calibrate accurately — best used for products where precision is less critical (lime, fertilizer) rather than herbicides. Scotts Wizz battery-powered is the most consistent hand-held option.
Lay a plastic tarp or large sheet (at least 10 ft × spreader width) on a flat hard surface. Mark the tarp's leading and trailing edge with tape.
Fill spreader with a known weight of product. Walk at your normal pace across the tarp, opening the spreader at the leading mark and closing at the trailing mark.
Collect and weigh the product on the tarp. Calculate: lbs per 1k = (oz collected ÷ 16) × (1000 ÷ tarp sq ft)
Compare to your target rate. If too high, lower the setting by 1 notch. If too low, raise by 1 notch. Repeat until within ±10% of target.
| Pattern | Best For | Setting Adjustment |
|---|---|---|
| Single pass (parallel rows) | Drop spreader, even lawns | Full rate setting |
| 2 perpendicular passes | Broadcast, seeds, lime | Set to ½ target rate per pass |
| Perimeter pass first | All spreader types | Full rate; do edges before field |
| Half-rate header passes | Turnarounds at lawn ends | Half-rate; prevents double-overlap |
• Wrong scale: Using Scotts scale settings on an Earthway spreader — completely wrong
• Skipping calibration: Label settings are starting points, not guarantees
• Over-filling hopper: Increased weight changes particle flow rate at same setting
• Variable walking speed: Slowing at turns doubles application rate in that area
• Spreading on wet grass: Granules clump and distribute unevenly; can cause burn spots
• Not cleaning after use: Fertilizer residue corrodes spreader parts — rinse after every use
Spreader settings are helpful starting points, but the final answer should always be confirmed with a quick calibration test. This section explains how to turn a bag rate, product label, and spreader model into an accurate real-world application.
A fertilizer spreader setting is not a fixed scientific unit. It is simply the opening size or gate position on one particular spreader model. That means a setting of 5 on a Scotts EdgeGuard, 5 on a Scotts drop spreader, 5 on an Earthway 2150, and 5 on an Agri-Fab broadcast spreader can all release different amounts of product. The product itself changes the output too: coated fertilizer prills, fine seed, pelletized lime, organic biosolids, pre-emergent granules, and small sulfur particles all flow differently through the same gate.
The safest method is to treat the calculator result as a starting setting, then verify it by measuring product output over a known area. If your fertilizer bag says to apply 4 pounds per 1,000 square feet, the spreader should release close to 4 pounds after you walk a 1,000-square-foot test area at your normal pace. If it releases only 3 pounds, open the setting slightly. If it releases 5 pounds, close the setting. The goal is not a perfect number; being within about 10 percent is normally close enough for a homeowner lawn application.
Use the setting printed on the product bag or manufacturer page before using any generic conversion chart. Manufacturers test their own granule size, density, and recommended rate against common spreader models. Scotts, for example, directs users to find the specific product page, open the product information, and check the “Spreader Settings” or downloaded product label for the correct model-specific setting. If your exact spreader is not listed, use the nearest model as a starting point and then calibrate.
For most broadcast applications, the cleanest pattern is two perpendicular half-rate passes. Put half the product in the hopper, apply north-to-south, then apply the remaining half east-to-west. This cross-hatch pattern reduces striping, softens small walking-speed errors, and improves edge-to-edge uniformity. It is especially useful for lawn fertilizer, overseeding, lime, and organic products such as Milorganite. For pre-emergent herbicides, follow the label carefully because even coverage is critical and under-applied strips may allow crabgrass or annual bluegrass to break through.
If the product has a label setting for your exact spreader, start there. If it does not, use the calculator's estimate at half rate, make two passes, and calibrate on a tarp before you treat the whole lawn. This lowers the risk of burn, streaks, missed areas, and wasted product.
| Target Rate | Product Over 500 sq ft | Product Over 250 sq ft |
|---|---|---|
| 1 lb / 1,000 sq ft | 0.5 lb / 8 oz | 0.25 lb / 4 oz |
| 2 lbs / 1,000 sq ft | 1 lb / 16 oz | 0.5 lb / 8 oz |
| 4 lbs / 1,000 sq ft | 2 lbs / 32 oz | 1 lb / 16 oz |
| 6 lbs / 1,000 sq ft | 3 lbs / 48 oz | 1.5 lbs / 24 oz |
| 10 lbs / 1,000 sq ft | 5 lbs / 80 oz | 2.5 lbs / 40 oz |
| Product | Best Pattern | Risk if Wrong |
|---|---|---|
| Quick-release fertilizer | Two half-rate passes | Burn streaks |
| Slow-release fertilizer | One or two passes | Uneven color |
| Milorganite / organic | Heavy setting, slow pace | Light feeding if under-applied |
| Grass seed | Two perpendicular passes | Patchy germination |
| Pelletized lime | Multiple lighter passes | Clumping, dusty residue |
| Pre-emergent | Label rate exactly | Weed breakthrough or turf stress |
Measure the lawn area, read the product label, verify the target rate per 1,000 square feet, and make sure the spreader gate opens and closes freely.
Walk at one consistent pace, close the gate before turning, overlap broadcast rows by about half the swath, and avoid wet grass or windy conditions.
Blow or sweep granules off hard surfaces, water in if the product label requires it, clean the hopper, and store leftover product in a sealed dry bag.
Check for clogged holes, clumped fertilizer, low tire pressure, wrong walking speed, missed overlap, or using a setting from another spreader brand.
Most fertilizer stripes, missed areas, and burn marks come from one of a few preventable setup mistakes. Use this guide before changing product or blaming the spreader.
Dark green stripes usually mean product was doubled along overlap lines, at turning points, or where the spreader gate stayed open while the operator slowed down. Broadcast spreaders throw more material in the center of the swath than at the edges, so overlap matters. For a 10-foot broadcast pattern, walking rows about 5 feet apart is a better starting point than trying to place swaths edge-to-edge. Drop spreaders create stripes when wheel tracks are not aligned correctly or when a user leaves a small gap between passes.
Light stripes mean under-application. Common causes include a setting that is too low, a partially clogged gate, walking too quickly, or leaving too much distance between broadcast passes. Fine grass seed can bridge in the hopper, while damp fertilizer may clump and stop flowing. Stop, close the gate, empty the hopper if needed, break up clumps, and recalibrate before continuing.
Burn spots usually happen when quick-release nitrogen sits on leaf blades too long or when the same area receives too much product. Avoid applying granular fertilizer to wet grass, because granules can stick to blades and create concentrated burn points. After applying most granular fertilizer, water lightly to move nutrients off foliage and into the soil, unless the label says otherwise. Never use a higher spreader setting to “finish the bag” if the lawn area is already covered.
If your spreader is not listed on the bag, do not rely on a random conversion chart as the final answer. Start with a low-to-medium setting, apply a measured amount over a test area, and calculate the actual rate. For a product target of 4 pounds per 1,000 square feet, a 250-square-foot test area should use about 1 pound. Adjust the gate up or down and repeat until close. This method works for any brand, including older spreaders where the label scale no longer matches new product charts.
| Problem | Likely Cause | Fix |
|---|---|---|
| Dark bands | Too much overlap | Two half-rate passes |
| Light bands | Not enough overlap | Rows closer together |
| Burn spots | Wet grass or double-dose | Water in, close at turns |
| Clogs | Damp product | Dry product, clean hopper |
| Too much leftover | Setting too low | Open one notch |
| Bag runs out early | Setting too high | Close one notch |
Measure a test strip equal to one-fifth of your lawn area. Load one-fifth of the total product. If the hopper empties almost exactly at the end of the strip, your setting and pace are close. If it empties early, close the setting; if product remains, open it.
Bag coverage assumes the manufacturer's intended application rate. If your soil test, nitrogen target, or state fertilizer rule requires a different rate, the actual coverage changes. Use the coverage statement as a label reference, then verify with the product rate calculator.
This calculator combines fertilizer math, manufacturer label practices, and real-world calibration logic. It is designed to help homeowners start safely, then confirm the final setting before treating the whole lawn.
First, we calculate the amount of product your lawn needs from the target rate per 1,000 square feet. That part is straightforward: total product equals the target rate multiplied by your lawn area in thousands of square feet. If a fertilizer recommendation is written as actual nitrogen instead of product weight, use the lawn fertilizer calculator first, then bring the product rate into this spreader settings calculator.
Second, we map the target product rate onto the approximate scale of your selected spreader model. Broadcast spreaders usually have a wider gate and larger swath, while drop spreaders deliver a narrow measured strip. Hand-held spreaders are the least precise and should be used mainly for small lawns, spot treatments, or light touch-up work. Because no online calculator can know your walking speed, product moisture, particle size, or the condition of your spreader gate, the result is labeled as a starting setting rather than a guaranteed setting.
Third, we recommend a calibration check. This is the step many homeowners skip, but it is also the step that prevents the most expensive mistakes. A quick test over 250 or 500 square feet tells you whether the spreader is actually releasing the amount you think it is releasing. If the test rate is close, you can continue with confidence. If it is far off, adjust the setting before any damage or waste happens.
For regulated products such as herbicide, pre-emergent, weed-and-feed, insect control granules, or fungicide, the product label controls the legal maximum rate and required safety instructions. Use this calculator only as a planning and calibration helper. The label rate, PPE instructions, re-entry interval, water-in requirement, and state-specific restrictions always come first.
| Can Help With | Still Requires You |
|---|---|
| Estimate a starting setting | Verify with product label |
| Calculate total product needed | Measure actual lawn area |
| Choose overlap and pass pattern | Walk at consistent speed |
| Plan hopper fills | Clean and maintain the spreader |
| Reduce striping risk | Calibrate on tarp or test strip |
The calculator is not a replacement for a product label. If the label gives a lower rate, a restricted application window, a water-in requirement, or a warning for your grass type, follow the label exactly.
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