Agri-Fab vs. Scotts Spreader (Settings Chart)
There is no reliable universal dial conversion between Agri-Fab and Scotts spreaders. Choose a setting only when the product label names your exact spreader model. Otherwise, calibrate it: measure the label rate, test a known area, weigh the product used, and adjust the dial until the amount matches. The label rate—not a matching dial number—controls.
If you are trying to avoid a wasted bag of fertilizer or a damaged lawn, a trustworthy setting matters more than a quick brand-to-brand comparison. The value for money comes from applying only the amount the label calls for, with the spreader you own. I use the same rule for both brands: identify the exact model and product first, then verify the rate in a measured test.
Agri-Fab and Scotts settings: what the numbers mean
A spreader setting is the gate opening used to meter product from the hopper. It is not a measure of pounds per square foot, and dial numbers are not standardized across brands or models. A Scotts setting and an Agri-Fab setting can look alike while dispensing different amounts.
A product package may give a setting for certain spreader models. Treat that setting as model-specific, not as a general instruction for every Scotts or Agri-Fab spreader. If your model is not listed, use the label’s rate and calibrate your spreader instead of guessing from another chart.
Quick comparison chart
This chart shows how to choose a starting point. It does not claim a dial-number conversion; the product label and a measured calibration determine the working setting.
| What you have | What to check | How to choose the setting |
|---|---|---|
| Scotts spreader and product label lists your exact model | Full model name or number, product, and application rate | Use the label setting, then check that the spreader is working correctly |
| Agri-Fab spreader and product label lists your exact model | Full model number and label rate | Use the label setting, then verify application on a measured area |
| Either brand, but the exact model is not listed | Product rate and allowed application method | Calibrate your spreader; another model’s setting is only a trial starting point |
| Switching between Scotts and Agri-Fab | New model, gate, product, and operating pace | Recalibrate; do not copy the old dial number |
Key takeaway: A dial number is meaningful only with its spreader model and product. Record those details together.
Check the label and spreader before filling
Preparation means confirming the product, target area, rate, equipment, and safety directions before putting granules in the hopper. This step prevents a wrong-product setting from becoming a full-lawn mistake. It also helps catch a sticking gate or blocked agitator that can make any dial setting unreliable.
Read the whole product label. Confirm that it permits application with a spreader, gives a target rate, and names any spreader settings or models. Note the required protective equipment and any limits on where or when to apply. Keep granules away from drains, ditches, and waterways.
Before filling, check that the spreader is level and serviceable. The hopper should be sound, the shutoff gate should open and close fully, and the agitator and wheels should turn freely. Close the gate while filling to reduce spills. Use the exact model number printed on the spreader or in its manual, not just a broad product name.
Key takeaway: If the label does not allow your application method, or the spreader gate does not work smoothly, stop and resolve that first.
Calibrate to the product rate
Calibration is a measured test that shows how much product your spreader puts down over a known area. It links the label’s rate to your specific spreader and walking pace. A setting borrowed from a different product or model can help you begin a test, but it does not confirm the correct rate.
Calculate the target amount
For a label rate stated in pounds per 1,000 square feet, use:
Target product (lb) = label rate (lb per 1,000 ft²) × test area (ft²) ÷ 1,000
For example, if a label calls for 3 lb per 1,000 ft² and your measured test area is 1,000 ft², the target is 3 lb. This is an arithmetic example only, not a recommendation for any product. For a smaller area, use the same formula; at 500 ft², the target would be 1.5 lb.
Measure the test area, then weigh the product you plan to use. After the test, weigh what remains. The difference is the amount dispensed. Use a scale suitable for the amount being weighed, and keep the test area and product handling consistent with label directions.
Run the test and adjust
- Mark a measured test area, ideally 1,000 ft² when practical. Record the product, exact spreader model, and label rate.
- Set a candidate dial position. If the label gives no setting for your exact model, a setting from another product or model is only a trial starting point.
- Walk at a steady, measured pace. Keep the spreader level and follow the label’s directions for the pattern and overlap.
- Weigh the remaining product. Subtract that weight from the starting weight to find how much the test used.
- Compare the amount used with the target. Adjust the dial in small increments and repeat until the amount is close to the label rate.
Do not change your walking speed to make a poor setting seem right. Travel speed affects application rate, so calibrate and apply at a steady pace. Also measure the spreader’s effective swath: that is the actual spread pattern in the field, not the model’s advertised width. Follow the label’s overlap instructions.
Key takeaway: The target amount comes from the label and measured area. The dial is adjusted to meet that target, not the other way around.
Worked calibration examples
These examples show how to use a chart without treating it as a brand conversion. They are hypothetical calculations, not product instructions. Your label rate, exact model, test area, spread pattern, and pace determine your own result.
| Scenario | Test and measurement | What to do next |
|---|---|---|
| Agri-Fab model is not named on the label | On 1,000 ft², a hypothetical label rate of 3 lb means the target is 3 lb. The test uses 4 lb. | Close the gate, adjust the setting incrementally, and repeat the measured test. |
| Scotts label lists a setting for your exact model | The spreader is in working order, and the label’s rate and setting match your product and model. | Start at that setting, then check the amount used over a measured area. |
| Switching from Scotts to Agri-Fab | The old dial setting was calibrated for another spreader. | Treat the new dial as uncalibrated and repeat the test for the new model. |
| Product or conditions change | The product, gate parts, pace, or spread pattern is different. | Recheck calibration rather than relying on the previous record. |
In a practical comparison, the common trap is assuming the same number on two dials means the same output. It does not. If a test uses more product than the target, close the gate and reduce the opening; if it uses less, increase the opening. Make small changes and retest rather than making a large guess.
A product’s rate and directions always take priority. This matters especially for pesticides: using an unverified cross-brand chart can cause overapplication, turf damage, or runoff, and may conflict with the product label. Do not apply beyond the label rate to compensate for a poor pattern.
Key takeaway: Use the chart to organize the job, not to invent a cross-brand setting.
Apply at the calibrated setting
Application means distributing the calibrated amount over the intended area while keeping pace, swath, overlap, and gate control consistent with the test. Even a correctly calibrated spreader can apply unevenly if you walk faster, change the pattern, or leave the gate open while turning.
Walk at the measured pace you used during calibration. Keep the spreader level, follow the label’s overlap and application pattern, and avoid windy conditions that could carry granules off target. Close the gate before stopping, turning, or crossing a surface that should not receive product.
If the label directs more than one pass or a particular pattern, follow those directions rather than substituting a guessed method. Keep the product on the intended area. Where label directions permit, sweep stray granules back onto that area; do not sweep them toward a drain, ditch, or waterway.
Key takeaway: A calibrated setting only works when you repeat the pace and pattern used for the test.
Clean, adjust, and store the spreader
Maintenance keeps the gate and feed parts moving as intended, which supports repeatable application. Remove residue after use and follow the exact model manual for cleaning, lubrication, and adjustment. Store the spreader clean and dry to limit corrosion, and keep unused product only as its label directs.
Empty and clean the hopper and gate as directed by the manual and product label. Keep granules and cleanup material out of storm drains, ditches, and waterways. Do not rinse the spreader where wash water can reach them. Check that the gate closes fully and that the agitator and wheels move freely.
Do not bend or modify the gate to compensate for an uncalibrated dial. Consult the manual for approved adjustments. Record the product, label rate, spreader model, dial setting, pace, and measured swath after calibration. Recheck before the next application; product formulation, equipment condition, or your pace may have changed.
Key takeaway: Keep a calibration record, but confirm it again when the product, equipment, or application conditions change.
FAQ: Agri-Fab and Scotts spreader settings
These answers address the most common setting questions. The central rule is to match the product label to the exact spreader model and verify the amount over a measured area. When a label does not name your model, calibration is the dependable route.
Can I use a Scotts setting on an Agri-Fab spreader?
Not as a verified setting. The dial scales are not standardized; calibrate the Agri-Fab model to the product’s label rate.
Are Agri-Fab and Scotts dial numbers interchangeable?
No. A number on one brand’s dial does not establish the same gate opening or product output on the other brand.
What if the product label does not list my spreader model?
Use the label rate and calibrate your spreader over a measured area. Any setting from another model is only a starting point.
How much product should I use for a 1,000-square-foot test?
Use the amount stated by the label per 1,000 ft². For another test size, multiply the label rate by the test area, then divide by 1,000.
Should I trust a setting chart found online?
Only if it clearly matches your exact product and spreader model and is consistent with the product label. Otherwise, verify the rate with a measured test.
Why did my old setting apply too much product?
The product, spreader model, gate condition, pace, or swath may have changed. Recheck those factors and recalibrate.
Do I need to calibrate again when I change products?
Yes. Different products can flow differently, so verify the rate for each product and follow its label.
Can I clean the spreader near a storm drain?
No. Keep granules, sweepings, and rinse water out of storm drains, ditches, and waterways.
What details should I keep in my calibration record?
Record the product and label rate, exact spreader model, dial setting, test area, amount used, walking pace, and effective swath.
Bottom line: Choose settings by exact product and spreader model when the label provides them. Otherwise, calibrate, apply at the measured pace and pattern, and keep the product rate within label directions.
(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)
