Pool & Yard Math
Precision calculators for pool chemistry, lawn fertilizer, seed coverage, and outdoor maintenance. Get the right amounts every time.
Pool Chlorine Calculator
Calculate chlorine & shock treatment amounts
To raise chlorine from to ppm
Cal-hypo shock (weekly maintenance)
Jump to Calculator
Quick Reference
- Free Chlorine1-3 ppm
- pH Level7.2-7.6
- Total Alkalinity80-120 ppm
- CYA (Stabilizer)30-50 ppm
Lawn Fertilizer Calculator
Calculate how much fertilizer your lawn needs
Example: 20-0-10
At 1 lb N per 1,000 sq ft
Based on % nitrogen
lb bags
Grass Seed Calculator
Calculate seed coverage for new lawns or overseeding
At lbs per 1,000 sq ft for
Buy 10% extra to account for edges and waste
Mulch Calculator
Calculate mulch needed for flower beds and landscaping
For bulk delivery
Standard bag size
Pool pH Balancer
Calculate acid or soda ash to balance pH
To pH from to
Add chemicals slowly and retest after 4 hours
Ideal Pool Chemistry Levels
| Parameter | Ideal Range | Notes |
|---|---|---|
| Free Chlorine | 1-3 ppm | Keep above 1 ppm for sanitation |
| pH | 7.2-7.6 | Affects chlorine efficacy |
| Total Alkalinity | 80-120 ppm | Stabilizes pH levels |
| Cyanuric Acid (CYA) | 30-50 ppm | Protects chlorine from UV |
| Calcium Hardness | 200-400 ppm | Prevents plaster damage |
Verification
Sources & Guidelines
- • Association of Pool & Spa Professionals
- • University Extension Lawn Care Guides
- • EPA Water Treatment Standards