{
  "slug": "pool-gallons-round-calculator",
  "title": "Round Pool Gallons Calculator",
  "heading": "Round Pool Gallons Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/pool-gallons-round-calculator",
  "summary": "Get total gallons for a round or circular above-ground pool from diameter and depth.",
  "description": "Round above-ground pools are one of the most common backyard pool styles, and their volume formula differs from a rectangular pool because it's based on a circle's area rather than a simple length-times-width rectangle. This calculator takes the pool's diameter and its water depth, computes the circular area using radius squared times pi, then multiplies by depth and the 7.5 gallons-per-cubic-foot constant to get total gallons. Round pools typically hold a single constant depth rather than sloping from shallow to deep, which actually makes this calculation simpler than a rectangular in-ground pool's average-depth math. Getting the gallon count right matters most when dosing shock or balancing chlorine after a fill, since manufacturer dosing instructions are almost always written per 10,000 gallons, and a round pool's actual capacity is easy to misjudge by eye given how much water a circular footprint holds compared to what it looks like from the deck.",
  "formula": "Gallons = π × (Diameter ÷ 2)² × Depth × 7.5",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=pool-gallons-round-calculator",
  "inputs": [
    {
      "id": "diameter",
      "label": "Diameter",
      "kind": "number",
      "hint": null,
      "default": 24,
      "unit": "ft",
      "min": 5,
      "max": 60
    },
    {
      "id": "depth",
      "label": "Water depth",
      "kind": "number",
      "hint": null,
      "default": 4.5,
      "unit": "ft",
      "min": 1,
      "max": 12
    }
  ],
  "outputs": [
    {
      "id": "gallons",
      "label": "Total pool gallons",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "area",
      "label": "Surface area",
      "format": "number",
      "hint": "sq ft",
      "primary": false
    },
    {
      "id": "cubicFeet",
      "label": "Total cubic feet",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Diameter: 24 ft",
      "Water depth: 4.5 ft"
    ],
    "outputs": [
      "Total pool gallons: 15,268",
      "Surface area: 452",
      "Total cubic feet: 2,036"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter diameter (ft).",
      "Enter water depth (ft).",
      "Read your total pool gallons on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "diameter": 14,
        "depth": 2.6999999999999997
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "diameter": 24,
        "depth": 4.5
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "diameter": 38,
        "depth": 7.2
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How much water does a 24 ft round pool hold?",
      "a": "At a typical 4.5 ft depth, a 24 ft diameter round pool holds roughly 15,250 gallons, which is why most above-ground pool manufacturers list capacity directly on the box for common diameter and depth combinations."
    },
    {
      "q": "Do above-ground round pools have varying depth?",
      "a": "Most standard above-ground round pools hold a single constant depth throughout, unlike in-ground pools that slope, which simplifies the math to one depth measurement instead of an average."
    },
    {
      "q": "Why is pi used in this formula?",
      "a": "A round pool's surface is a circle, and a circle's area is calculated as pi times radius squared, so that constant is required to convert diameter into a usable area before multiplying by depth."
    },
    {
      "q": "How do I measure water depth accurately?",
      "a": "Measure straight down from the water's surface to the pool floor at a few points if the liner isn't perfectly flat, and use the actual filled water line rather than the pool wall's full height."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/pool-gallons-rectangular-calculator",
    "https://www.revenuelab.fyi/toolbox/pool-gallons-oval-calculator",
    "https://www.revenuelab.fyi/toolbox/hot-tub-gallons-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Round Pool Gallons Calculator (https://www.revenuelab.fyi/toolbox/pool-gallons-round-calculator)"
}