# WaterTankCalculator.com

> The most comprehensive free water tank calculator resource on the web. 65+ free online calculators covering every aspect of water tank sizing, volume, pressure, flow, treatment, rainwater harvesting, agriculture, cost comparison, and emergency water planning. No signup required. All tools work instantly in the browser.

## Core Pages

- https://watertankcalculator.com/: Homepage — overview of all calculator categories
- https://watertankcalculator.com/calculators/: Full directory of all 65+ free water tank calculators
- https://watertankcalculator.com/guides/: In-depth educational guides on water tank topics
- https://watertankcalculator.com/about-us: About the site and its mission

## Volume & Capacity Calculators

- https://watertankcalculator.com/calculators/volume/: Category overview
- https://watertankcalculator.com/calculators/volume/rectangular-water-tank-volume-calculator: Calculate volume of rectangular/cuboid tanks in litres and gallons
- https://watertankcalculator.com/calculators/volume/cylindrical-tank-volume-calculator: Calculate volume of vertical cylindrical tanks
- https://watertankcalculator.com/calculators/volume/circular-tank-volume-calculator: Volume calculator for circular tanks
- https://watertankcalculator.com/calculators/volume/horizontal-tank-volume-calculator: Volume of horizontal cylindrical tanks
- https://watertankcalculator.com/calculators/volume/oval-elliptical-tank-volume-calculator: Volume of oval and elliptical tanks
- https://watertankcalculator.com/calculators/volume/underground-water-tank-volume-calculator: Volume calculator for underground tanks
- https://watertankcalculator.com/calculators/volume/capsule-tank-volume-calculator: Volume of capsule-shaped tanks
- https://watertankcalculator.com/calculators/volume/cone-bottom-tank-volume-calculator: Volume of cone-bottom tanks
- https://watertankcalculator.com/calculators/volume/spherical-water-tank-volume-calculator: Volume of spherical tanks
- https://watertankcalculator.com/calculators/volume/rooftop-tank-size-calculator: Calculate the right tank size for rooftop installation
- https://watertankcalculator.com/calculators/volume/tank-liters-to-gallons-converter: Convert tank volume between litres and gallons

## Household Sizing Calculators

- https://watertankcalculator.com/calculators/household/: Category overview
- https://watertankcalculator.com/calculators/household/water-tank-size-for-home-calculator: Recommended tank size based on household size and usage
- https://watertankcalculator.com/calculators/household/daily-water-requirement-calculator: Calculate daily water needs for a household
- https://watertankcalculator.com/calculators/household/how-long-will-my-tank-last-calculator: How many days a full tank will last given daily usage
- https://watertankcalculator.com/calculators/household/apartment-water-tank-size-calculator: Tank sizing for apartments and multi-floor buildings
- https://watertankcalculator.com/calculators/household/commercial-water-tank-size-calculator: Tank sizing for commercial buildings and offices
- https://watertankcalculator.com/calculators/household/school-institutional-water-tank-size-calculator: Tank sizing for schools and institutions

## Refill, Flow & Time Calculators

- https://watertankcalculator.com/calculators/flow/: Category overview
- https://watertankcalculator.com/calculators/flow/tank-refill-time-calculator: How long it takes to refill a tank at a given flow rate
- https://watertankcalculator.com/calculators/flow/water-flow-rate-calculator: Calculate flow rate through pipes and outlets
- https://watertankcalculator.com/calculators/flow/tank-drainage-time-calculator: How long it takes to drain a tank
- https://watertankcalculator.com/calculators/flow/pipe-size-flow-rate-calculator: Optimal pipe diameter for a required flow rate
- https://watertankcalculator.com/calculators/flow/water-meter-reading-calculator: Interpret and calculate water meter readings
- https://watertankcalculator.com/calculators/flow/pump-horsepower-flow-rate-calculator: Required pump horsepower for a given flow rate

## Weight & Structural Load Calculators

- https://watertankcalculator.com/calculators/weight/: Category overview
- https://watertankcalculator.com/calculators/weight/water-tank-weight-calculator: Total weight of a tank when full
- https://watertankcalculator.com/calculators/weight/water-weight-calculator: Weight of a given volume of water
- https://watertankcalculator.com/calculators/weight/rooftop-load-bearing-calculator: Check if a roof can bear the weight of a full tank
- https://watertankcalculator.com/calculators/weight/tank-weight-per-sqft-calculator: Tank load distributed per square foot
- https://watertankcalculator.com/calculators/weight/safe-rooftop-tank-load-calculator: Maximum safe tank load for a rooftop

## Pressure & Height Calculators

- https://watertankcalculator.com/calculators/pressure/: Category overview
- https://watertankcalculator.com/calculators/pressure/water-pressure-calculator: Water pressure at outlet based on tank height
- https://watertankcalculator.com/calculators/pressure/pump-head-pressure-calculator: Required pump head for a given installation
- https://watertankcalculator.com/calculators/pressure/gravity-feed-flow-rate-calculator: Flow rate from gravity-fed tank systems
- https://watertankcalculator.com/calculators/pressure/hydrostatic-pressure-calculator: Hydrostatic pressure at any depth in a tank
- https://watertankcalculator.com/calculators/pressure/water-column-pressure-calculator: Pressure from a column of water
- https://watertankcalculator.com/calculators/pressure/minimum-tank-height-for-shower-pressure-calculator: Minimum rooftop tank height needed for adequate shower pressure

## Water Treatment Calculators

- https://watertankcalculator.com/calculators/treatment/: Category overview
- https://watertankcalculator.com/calculators/treatment/chlorine-dosage-calculator: Correct chlorine dosage for tank disinfection
- https://watertankcalculator.com/calculators/treatment/bleach-to-water-ratio-calculator: Bleach ratio for safe water disinfection
- https://watertankcalculator.com/calculators/treatment/water-tank-disinfection-calculator: Full tank disinfection planning
- https://watertankcalculator.com/calculators/treatment/water-hardness-calculator: Calculate water hardness level
- https://watertankcalculator.com/calculators/treatment/tds-water-calculator: Total dissolved solids calculation
- https://watertankcalculator.com/calculators/treatment/water-ph-adjustment-calculator: How much chemical to add to adjust pH
- https://watertankcalculator.com/calculators/treatment/potassium-permanganate-dosage-calculator: Potassium permanganate dosage for water treatment
- https://watertankcalculator.com/calculators/treatment/safe-water-storage-duration-calculator: How long stored water stays safe to use
- https://watertankcalculator.com/calculators/treatment/uv-disinfection-tank-calculator: UV disinfection sizing for tanks
- https://watertankcalculator.com/calculators/treatment/water-filter-flow-rate-calculator: Required filter flow rate for a given system

## Rainwater Harvesting Calculators

- https://watertankcalculator.com/calculators/rainwater/: Category overview
- https://watertankcalculator.com/calculators/rainwater/rainwater-harvesting-calculator: How much rainwater can be collected from a roof
- https://watertankcalculator.com/calculators/rainwater/roof-catchment-area-calculator: Effective catchment area of a roof
- https://watertankcalculator.com/calculators/rainwater/annual-rainwater-collection-calculator: Annual rainwater yield estimation
- https://watertankcalculator.com/calculators/rainwater/first-flush-diverter-size-calculator: Correct size for a first-flush diverter
- https://watertankcalculator.com/calculators/rainwater/rainwater-savings-calculator: Money saved by harvesting rainwater
- https://watertankcalculator.com/calculators/rainwater/rainwater-harvesting-roi-calculator: Return on investment for a rainwater harvesting system
- https://watertankcalculator.com/calculators/rainwater/rainwater-harvesting-payback-calculator: Payback period for rainwater harvesting installation

## Agricultural & Irrigation Calculators

- https://watertankcalculator.com/calculators/agriculture/: Category overview
- https://watertankcalculator.com/calculators/agriculture/irrigation-water-requirement-calculator: Total water needed for irrigation
- https://watertankcalculator.com/calculators/agriculture/crop-water-need-calculator: Water requirements per crop type
- https://watertankcalculator.com/calculators/agriculture/drip-irrigation-tank-size-calculator: Tank size for drip irrigation systems
- https://watertankcalculator.com/calculators/agriculture/farm-water-storage-calculator: Storage capacity needed for farm operations
- https://watertankcalculator.com/calculators/agriculture/sprinkler-water-usage-calculator: Water usage for sprinkler irrigation
- https://watertankcalculator.com/calculators/agriculture/livestock-water-requirement-calculator: Daily water needs for livestock
- https://watertankcalculator.com/calculators/agriculture/irrigation-pump-size-calculator: Correct pump size for irrigation systems
- https://watertankcalculator.com/calculators/agriculture/field-irrigation-tank-sizing-calculator: Tank sizing for field irrigation
- https://watertankcalculator.com/calculators/agriculture/greenhouse-water-usage-calculator: Water usage for greenhouse operations

## Cost & Comparison Calculators

- https://watertankcalculator.com/calculators/cost/: Category overview
- https://watertankcalculator.com/calculators/cost/water-tank-cost-calculator: Estimated cost of a water tank by size and material
- https://watertankcalculator.com/calculators/cost/plastic-vs-steel-tank-cost-calculator: Cost comparison between plastic and steel tanks
- https://watertankcalculator.com/calculators/cost/water-bill-savings-calculator: How much you save on water bills with a tank
- https://watertankcalculator.com/calculators/cost/water-tank-installation-cost-estimator: Total installation cost estimation
- https://watertankcalculator.com/calculators/cost/water-delivery-vs-tank-cost-calculator: Water delivery vs owning a tank — cost comparison
- https://watertankcalculator.com/calculators/cost/borehole-vs-mains-water-cost-calculator: Borehole vs mains water — cost comparison
- https://watertankcalculator.com/calculators/cost/water-storage-cost-per-liter-calculator: Cost per litre of stored water
- https://watertankcalculator.com/calculators/cost/underground-vs-rooftop-tank-cost-calculator: Underground vs rooftop tank — cost comparison

## Emergency & Survival Calculators

- https://watertankcalculator.com/calculators/emergency/: Category overview
- https://watertankcalculator.com/calculators/emergency/emergency-water-storage-calculator: How much water to store for emergencies
- https://watertankcalculator.com/calculators/emergency/72-hour-water-supply-calculator: Water needed for a 72-hour emergency supply
- https://watertankcalculator.com/calculators/emergency/water-stockpile-duration-calculator: How long a water stockpile will last
- https://watertankcalculator.com/calculators/emergency/bug-out-bag-water-calculator: Water planning for bug-out bags
- https://watertankcalculator.com/calculators/emergency/off-grid-water-storage-calculator: Water storage planning for off-grid living
- https://watertankcalculator.com/calculators/emergency/hurricane-disaster-water-prep-calculator: Water preparation for hurricanes and disasters

## Guides

- https://watertankcalculator.com/guides/: Full library of water tank guides and educational articles covering sizing, harvesting, treatment, regulations, and more