Calculator Volum Piscină – Galoane, Litri și Dozare Chimicale
Calculate your swimming pool's volume in gallons and liters. Choose your pool shape — rectangular, round, oval, kidney, or L-shaped — and get the exact water capacity plus recommendations for chemical treatment amounts and fill time estimates.
Cum se utilizează acest calculator
- Introduceți Pool Shape
- Introduceți Length (ft)
- Introduceți Width (ft)
- Introduceți Diameter (ft)
- Introduceți Longer Width (ft)
- Faceți clic pe butonul Calculați
- Citiți rezultatul afișat sub calculator
Pool Volume Formulas by Shape
Different pool shapes require different volume calculations:
- Rectangular: Volume = Length × Width × Average Depth × 7.48 gallons/ft³
- Circular: Volume = π × (Diameter/2)² × Average Depth × 7.48
- Oval: Volume = π/4 × Length × Width × Average Depth × 7.48
- Kidney: Volume = (Longer Width + Shorter Width)/2 × Length × Average Depth × 0.45 × 7.48
Average depth = (shallow end depth + deep end depth) / 2 — this is an approximation that works well for pools with gradual slopes. For pools with a sharp break between shallow and deep, calculate each section separately.
Why Pool Volume Matters
Knowing your pool's exact volume is essential for:
- Chemical dosing: All chemicals (chlorine, pH adjusters, algaecides, stabilizer) are dosed per 10,000 gallons. Incorrect dosing leads to unsafe water or chemical waste.
- Filtration sizing: Pool pump and filter should turn over the entire water volume 1–2× per day. Undersized equipment leads to cloudy water.
- Water bill: Know how much water you're buying when filling or refilling after a drain-and-refill.
- Heating cost: Gas, electric, or solar heaters are rated by BTU. Volume determines heating time and energy cost.
- Water weight: Important for above-ground pool placement (structural support) and transportation.
Common Pool Sizes and Volumes
| Pool Size | Volume (gallons) | Volume (liters) |
|---|---|---|
| 12 × 24 ft, avg 4.5 ft deep | ~9,700 gal | ~36,700 L |
| 16 × 32 ft, avg 5 ft deep | ~19,200 gal | ~72,600 L |
| 18 × 36 ft, avg 5.5 ft deep | ~26,700 gal | ~101,000 L |
| 20 × 40 ft, avg 5.5 ft deep | ~33,000 gal | ~125,000 L |
| 24 ft round, 4 ft deep | ~13,600 gal | ~51,500 L |
| 18 ft round, 4 ft deep | ~7,600 gal | ~28,800 L |
Pool Chemical Dosing Reference
Based on pool volume, standard chemical dosing guidelines (per 10,000 gallons):
- Chlorine (granular): 1–2 lbs to raise free chlorine by 1–2 ppm
- Chlorine (liquid, 12.5%): 20–30 oz to raise by 1 ppm
- pH Up (soda ash): 6 oz to raise pH by 0.2
- pH Down (muriatic acid): 26 oz to lower pH by 0.2
- Alkalinity Up (baking soda): 1.5 lbs to raise by 10 ppm
- Stabilizer (cyanuric acid): 2 lbs to raise by 20 ppm
- Algaecide: Follow label based on volume
Target ranges: Free Chlorine 1–3 ppm, pH 7.4–7.6, Total Alkalinity 80–120 ppm, Cyanuric Acid 30–50 ppm, Calcium Hardness 200–400 ppm.
Pool Fill Time Calculator
Estimate how long it takes to fill your pool based on water source flow rate:
- Garden hose (5/8"): ~10 gallons/minute = ~9 gal/min
- Garden hose (3/4"): ~12–15 gallons/minute
- Larger water supply line: 20–30+ gallons/minute
For a 20,000-gallon pool filled with a 5/8" hose at 9 gal/min: 20,000 ÷ 9 = 2,222 minutes ≈ 37 hours of continuous filling.
Note: Your water meter shows consumption in cubic feet (1 CF = 7.48 gallons) or CCF (100 cubic feet = 748 gallons). A 20,000-gallon fill = ~2,674 cubic feet or 26.7 CCF.
Above-Ground vs In-Ground Pool Differences
Volume calculations are the same regardless of pool type, but maintenance differs:
- Above-ground pools: Typically 10,000–20,000 gallons; smaller volume means chemicals deplete faster and water heats faster; structural limits on maximum weight (~1,000 lbs/ft² bearing capacity needed)
- In-ground concrete/gunite: 20,000–40,000+ gallons; more stable temperature and chemical balance; higher initial cost but longer lifespan
- Fiberglass: Pre-formed shapes with specific volumes; smoother surface resists algae
- Vinyl liner: Custom shapes; liner replacement every 8–12 years
Water Cost to Fill a Pool
Water rates vary significantly by location (US average: ~$6 per 1,000 gallons including sewage charges). But most utilities offer a "pool fill exemption" — you pay water rates but not sewage rates since pool water doesn't enter the sewer system.
A 20,000-gallon pool at $5/1,000 gallons (water only, no sewer) = $100 to fill. At $8/1,000 gallons with sewer = $160. Request a pool fill adjustment from your utility.
Ultima actualizare: March 2026
Frequently Asked Questions
How many gallons is an average swimming pool?
The average residential in-ground pool holds 15,000–30,000 gallons (57,000–115,000 liters). Standard backyard pools (16×32 ft, 5 ft average depth) hold approximately 19,000 gallons.
How do I calculate my pool volume?
For a rectangular pool: Length × Width × Average Depth (ft) × 7.48 = gallons. Average depth = (shallow + deep) / 2. Example: 20 × 40 × 5.5 × 7.48 = 32,912 gallons.
How much does it cost to fill a pool with water?
At $5 per 1,000 gallons (water only, no sewer charges): a 20,000-gallon pool costs $100. At $10/1,000 gallons (high-cost area with sewer): $200. Check with your water utility about pool fill adjustments.
How long does it take to fill a pool with a garden hose?
A standard 5/8" garden hose flows 9–10 gallons/minute. A 15,000-gallon pool takes 15,000 ÷ 9 ≈ 1,667 minutes ≈ 28 hours. Consider using two hoses or a 3/4" hose (12–15 gal/min) to reduce fill time.
How much chlorine do I need for a 10,000 gallon pool?
For initial chlorination or shocking: 1–2 lbs of granular chlorine (trichlor or cal-hypo) per 10,000 gallons. For maintenance: add enough to maintain 1–3 ppm free chlorine, tested 2–3 times per week in summer.
What is the water weight of a swimming pool?
Water weighs 8.34 lbs per gallon. A 20,000-gallon pool weighs 166,800 lbs (83 tons). This is why pool placement must consider soil bearing capacity and any underground utilities. Above-ground pools require a level, hard surface.
How often should I drain my pool?
Full drain and refill: every 5–7 years for concrete/plaster pools (accumulated TDS, cyanuric acid). Partial drain (1/3–1/2): when CYA exceeds 100 ppm or TDS exceeds 3,000 ppm. Many pool pros now use reverse osmosis water recycling instead of full drains.
What is the formula for round pool volume?
Gallons = π × r² × average depth × 7.48. Where r = radius (diameter/2). For an 18-ft round pool with 4-ft average depth: π × 9² × 4 × 7.48 = 3.14159 × 81 × 4 × 7.48 ≈ 7,603 gallons.
How do I calculate the volume of a pool with varying depth?
Method 1 (average depth): (shallow + deep)/2 × length × width × 7.48. Method 2 (two-section): calculate shallow section and deep section separately, then add. Method 2 is more accurate when there's a distinct break between shallow and deep.
How much water evaporates from a pool per day?
Pools typically lose 1/4–1/2 inch of water per day to evaporation in hot, dry, windy weather = 250–500+ gallons for a standard pool. Using a pool cover reduces evaporation by 70–90% and significantly reduces chemical loss.