Gallons Per Week
1,115
Monthly
4,829 gal
Cost/Month
$24.15
Hose Time
223 min/wk
Weekly Water Needed
1,115
gallons per week
Monthly
4,829 gal
Cost/Month
$24.15
Rainfall Savings
0.5" of weekly rainfall offsets ~716 gallons, already subtracted from totals above.
Inputs
Result
Veggie zone: 150 × 1.0 × 0.623 = 93.5 gal. Flowers: 100 × 0.75 × 0.623 = 46.7 gal. Base total = 140.2 gal. Climate-adjusted: 140.2 × 1.0 × 1.3 = 182.3 gal/week.
Inputs
Result
Lawn: 2,000 × 1.5 × 0.623 = 1,869 gal. Veggie garden: 300 × 1.5 × 0.623 = 280.4 gal. Base total = 2,149.4 gal. Arid + summer: 2,149.4 × 1.5 × 1.3 = 4,191.3 gal/week. Note: actual demand may be moderated by partial rain offset.
Inputs
Result
Lawn: 1,000 × 1.0 × 0.623 = 623 gal. Veggie: 200 × 1.0 × 0.623 = 124.6 gal. Drought-tolerant: 150 × 0.25 × 0.623 = 23.4 gal. Base total = 771 gal. Humid adjustment: 771 × 0.7 = 539.7 gal. Natural rain covers most of this in humid regions.
Most vegetable gardens need about 1 to 1.5 inches of water per week, which equals roughly 0.6 gallons per square foot per inch. A 200 sq ft garden at 1 inch per week requires about 125 gallons weekly. Established lawns need 1 inch per week, while newly seeded areas need 0.5 inches daily.
| Zone Type | Weekly Need (in) | Gallons per 200 sq ft | Season |
|---|---|---|---|
| Vegetable garden | 1–1.5 | 125–187 | Spring–Fall |
| Flower beds | 0.5–1.0 | 62–125 | Spring–Fall |
| Established lawn | 1.0 | 125 | Summer peak |
| New sod/seed | 3.5 (daily) | 435 | First 2–4 weeks |
| Drought-tolerant plants | 0.25–0.5 | 31–62 | Year-round |
Mulching, drip irrigation, watering early morning, and grouping plants by water need can cut water usage by 30–50%. A 2–3 inch mulch layer alone reduces evaporation by 25%. Drip irrigation delivers water directly to roots and uses 30–50% less than sprinklers.
Early morning between 6 AM and 10 AM is the best time to water. Cooler temperatures and lower wind reduce evaporation by up to 30%. Evening watering is second-best but can promote fungal disease if foliage stays wet overnight.
| Time | Evaporation Loss | Disease Risk | Recommendation |
|---|---|---|---|
| 6–10 AM | Low (5–10%) | Low | Best choice |
| 10 AM–2 PM | High (20–30%) | Low | Avoid if possible |
| 4–7 PM | Moderate (10–15%) | Moderate | OK for drip systems |
| After 7 PM | Low (5%) | High | Avoid overhead watering |
At the national average water rate of $5–$10 per 1,000 gallons, a 500 sq ft vegetable garden needing 310 gallons per week costs roughly $1.50–$3.00 weekly or $25–$50 over a 16-week growing season. Larger lawns can cost $200–$500 per season.
Hot, arid climates like the Southwest may need 2–3 inches of water per week for gardens, while cool, humid regions like the Pacific Northwest may need only 0.5–1 inch. Evapotranspiration rates double in hot, dry, windy conditions compared to mild, humid ones.
| Climate Zone | Weekly Need (in) | Annual Irrigation (gal/1,000 sq ft) | Rain Offset |
|---|---|---|---|
| Arid | 2–3 | 45,000–65,000 | 10–20% |
| Semi-arid | 1.5–2 | 30,000–45,000 | 30–40% |
| Temperate | 1–1.5 | 15,000–25,000 | 50–70% |
| Humid | 0.5–1 | 5,000–15,000 | 70–90% |
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Last Updated: Mar 9, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.