Applying the correct amount of Dimension 2EW is essential for effective pre-emergent weed control without damaging your lawn. Whether you’re preventing crabgrass in spring or targeting early post-emergent weeds, using a Dimension 2EW calculator ensures accurate rates, proper coverage, and compliance with label limits.
This guide explains:
- How to calculate Dimension 2EW per 1,000 sq ft
- Mixing rates for backpack and pump sprayers
- Annual maximum limits
- Split application strategies
- Water volume guidelines
- Common mistakes to avoid
By the end, you’ll know exactly how much product to apply for any lawn size.
What Is Dimension 2EW?
Dimension 2EW is a liquid pre-emergent herbicide containing dithiopyr (24%) as its active ingredient. It prevents weed seeds from developing and also provides early post-emergent control of crabgrass (up to 1–2 leaf stage).
Controls:
- Crabgrass
- Goosegrass
- Foxtail
- Spurge
- Annual bluegrass (Poa annua)
- Other annual grassy and broadleaf weeds
Unlike some pre-emergents, Dimension has limited early post-emergent activity, making it more flexible than many alternatives.
Why You Need a Dimension 2EW Calculator
Dimension 2EW is concentrated. Incorrect application can:
- Shorten protection period
- Cause turf injury
- Waste product
- Exceed annual limits
A proper Dimension 2EW calculator helps you:
- Convert square footage to ounces
- Stay within maximum yearly rate
- Adjust for protection length
- Mix accurately for sprayers
Dimension 2EW Label Rates
The typical application range is:
0.73 to 1.46 fluid ounces per 1,000 sq ft
The rate depends on:
- Desired months of protection
- Soil type
- Target weed pressure
- Climate
Higher rates = longer protection.
Dimension 2EW Calculator: Step-by-Step
Step 1: Measure Lawn Size
Accurate measurement is critical.
Example:
Lawn size = 6,000 sq ft
Step 2: Choose Desired Protection Length
| Months of Control | Rate per 1,000 sq ft |
|---|---|
| 3–4 Months | 0.73 oz |
| 5 Months | 1.0 oz |
| 6+ Months | 1.25–1.46 oz |
Step 3: Multiply by Lawn Size
Example:
6,000 sq ft at 1.0 oz per 1,000 sq ft
6 × 1.0 = 6 fluid ounces total
That is the amount of Dimension 2EW to mix into your spray tank.
Dimension 2EW Calculator Examples
1,000 sq ft (5 months)
1.0 oz
2,500 sq ft (5 months)
2.5 oz
5,000 sq ft (6 months at 1.25 rate)
6.25 oz
10,000 sq ft (4 months at 0.73 rate)
7.3 oz
Annual Maximum Rate
The annual maximum for Dimension 2EW is:
0.5 lbs active ingredient per acre
Converted:
Maximum product per acre = approx. 64 oz
Per 1,000 sq ft:
64 ÷ 43.56 = 1.47 oz per 1,000 sq ft annually
Never exceed this limit in a calendar year.
Split Application Strategy
Many professionals apply Dimension in split applications.
Example Split Plan
Spring:
0.73 oz per 1,000 sq ft
Early Summer:
0.73 oz per 1,000 sq ft
Total:
1.46 oz per 1,000 sq ft
This provides:
- Season-long crabgrass control
- Lower stress on turf
- Reduced leaching risk
Mixing Dimension 2EW
Water Volume Rule
Water volume ensures even coverage.
Typical recommendation:
1 gallon per 1,000 sq ft
Example:
If spraying 6,000 sq ft:
- Use 6 gallons of water
- Mix 6 oz Dimension 2EW into tank
Always agitate before and during spraying.
Backpack Sprayer Calibration
Calibration ensures accuracy.
Step 1
Spray 1,000 sq ft with water only.
Step 2
Measure water used.
If you used 0.8 gallons to cover 1,000 sq ft, that becomes your spray volume.
Step 3
Add correct herbicide rate per 1,000 sq ft into tank.
Warm-Season vs Cool-Season Grass Safety
Dimension 2EW is labeled safe for:
Warm-Season Grasses
- Bermuda
- Zoysia
- St. Augustine
- Centipede
- Bahia
Cool-Season Grasses
- Kentucky Bluegrass
- Perennial Ryegrass
- Tall Fescue
- Fine Fescue
Avoid applying before overseeding, as it will prevent grass seed germination.
When to Apply Dimension 2EW
Spring
Apply before soil reaches 55°F consistently.
Fall
Apply before Poa annua germination.
Timing is more important than rate.
Watering After Application
Dimension must be watered in with:
- 0.5 inches irrigation
OR - Rainfall within 7 days
Without watering, the herbicide will not form a soil barrier.
Dimension 2EW vs Prodiamine
Compared to Prodiamine, Dimension:
- Has early post-emergent activity
- Breaks down slightly faster
- Offers flexible application timing
- Is liquid (easier measuring for some users)
Both are effective pre-emergents when used correctly.
Mistakes Using a Dimension 2EW Calculator
1. Confusing Fluid Ounces with Dry Ounces
Dimension 2EW is liquid. Always measure fluid ounces.
2. Applying Too Late
If crabgrass has already tillered, control drops significantly.
3. Overlapping Spray Patterns
Leads to turf injury and exceeding annual limits.
4. Skipping Calibration
Incorrect sprayer output leads to uneven coverage.
How Long Does Dimension 2EW Last?
- Low rate: 3–4 months
- Mid rate: 5 months
- High rate: 6+ months
Higher rates extend protection but approach annual maximum faster.
Is Dimension 2EW Safe for Pets?
When used as directed:
- Safe after drying
- Low toxicity once soil-bound
Keep pets off treated area until spray dries.
Frequently Asked Questions
How much Dimension 2EW per gallon?
Depends on lawn size covered by that gallon. Usually 0.73–1.46 oz per 1,000 sq ft.
Can I apply twice per year?
Yes, as long as total annual rate does not exceed 1.47 oz per 1,000 sq ft.
Does Dimension kill existing weeds?
Only early-stage crabgrass. It is primarily pre-emergent.
Can I overseed after applying?
Wait several months depending on rate used.
Do I need surfactant?
Not required for standard pre-emergent applications.
Dimension 2EW Calculator
Dimension 2EW Calculator
Type in your total square feet that you want to cover in the field below and click “Calculate”. Apply the calculated amount of Dimension 2EW in fluid ounces and the recommended amount of water. Be sure to keep a note on the maximum annual amounts.
Final Thoughts
A Dimension 2EW calculator removes guesswork and ensures:
- Accurate mixing
- Maximum weed prevention
- Turf safety
- Label compliance
The key steps are:
- Measure lawn size
- Choose protection duration
- Multiply rate by square footage
- Mix with correct water volume
- Water in properly
When applied correctly, Dimension 2EW provides reliable, season-long crabgrass prevention and early weed control. Precision measurement turns a powerful herbicide into a safe and effective lawn management tool.
I’m David man behind Lawn Mowerly; I’ve been dealing with lawnmowers and Tractors with my father since I was a kid. I know every make and model and what each one is capable of and love helping people find the perfect equipment for their needs.