Water, Tank & Plumbing
Water Tank Volume Calculator
Capacity of a rectangular, cylindrical or horizontal tank in litres and gallons, with fill levels.
Rectangular V = l × w × h
Also called tank capacity calculator · water storage volume
Home & Construction · 12 calculators
Water, Tank & Plumbing Calculators
Tank volumes, water usage, flow rates, pipe volume and size, faucet flow, pool and aquarium volume, water pressure.
Water, Tank & Plumbing
Rectangular Tank Calculator
Capacity, fill volume and wall area of a rectangular tank or sump in litres and gallons.
V = length × width × height × 1000 litres…
Also called square tank volume · box tank capacity
Water, Tank & Plumbing
Cylindrical Tank Calculator
Capacity of a vertical or horizontal cylindrical tank, with the volume at any depth.
V = πr²L
Also called round tank volume · cylinder capacity calculator
Water, Tank & Plumbing
Water Usage Calculator
Household water consumption per day, month and year, with the cost and a fixture breakdown.
daily litres = Σ (fixture uses × litres p…
Also called water consumption calculator · household water use
Water, Tank & Plumbing
Flow Rate Calculator
Volumetric flow rate from pipe area and velocity (Q = A·v), in m³/s, L/min and gallons per minute.
Q = A × v = volume ÷ time
Also called volumetric flow rate · q = av
Water, Tank & Plumbing
Pipe Volume Calculator
Volume of water held in a length of pipe, with the weight and time to fill it.
V = π(d/2)² × length
Also called water in pipe · pipe capacity calculator
Water, Tank & Plumbing
Pipe Size Calculator
Pipe diameter needed for a required flow rate at a sensible velocity, with the next standard size.
A = Q / v
Also called pipe diameter calculator · what size pipe do i need
Water, Tank & Plumbing
Pipe Flow Calculator
Flow rate, velocity and pressure loss in a pipe using the Hazen-Williams equation.
Hazen-Williams: h_f = 10.67·L·Q^1.852 / (…
Also called pipe flow rate · hazen williams
Water, Tank & Plumbing
Faucet Flow Rate Calculator
Measure a tap or shower flow rate by timing how long it takes to fill a container.
L/min = container litres ÷ seconds × 60
Also called tap flow rate · shower flow rate test
Water, Tank & Plumbing
Pool Volume Calculator
Swimming pool volume for rectangular, round or sloping-floor pools, with chemical dosing basics.
volume = surface area × average depth
Also called swimming pool gallons · pool water volume
Water, Tank & Plumbing
Aquarium Volume Calculator
Tank volume in litres and gallons, with the real water volume after substrate.
litres = length × width × water depth ÷ 1…
Also called fish tank volume · tank litres calculator
Water, Tank & Plumbing
Water Pressure Calculator
Water pressure from the head height of a tank, and the head needed for a target pressure.
P = ρgh
Also called head pressure calculator · pressure from height of water
Key water, tank & plumbing formulas
| Water Tank Volume | Rectangular V = l × w × h · Cylinder V = πr²h · 1 m³ = 1,000 litres |
|---|---|
| Rectangular Tank | V = length × width × height × 1000 litres per m³ |
| Cylindrical Tank | V = πr²L · horizontal fill uses the circular segment area |
| Water Usage | daily litres = Σ (fixture uses × litres per use) |
| Flow Rate | Q = A × v = volume ÷ time |
| Pipe Volume | V = π(d/2)² × length |
| Pipe Size | A = Q / v · d = √(4A / π) |
| Pipe Flow | Hazen-Williams: h_f = 10.67·L·Q^1.852 / (C^1.852·d^4.87) |
| Faucet Flow Rate | L/min = container litres ÷ seconds × 60 |
| Pool Volume | volume = surface area × average depth |
Water, Tank & Plumbing questions
How many litres in a cubic metre?
Exactly 1,000 litres. One litre of water weighs one kilogram.