Calculators

Estimate how much grass seed you need for overseeding based on lawn size, seeding rate, current turf condition, and expected coverage efficiency.

Estimate garden hose flow rate in gallons per minute based on hose diameter, hose length, supply pressure, and nozzle restriction. This calculator uses a practical approximation where larger diameter and higher pressure increase flow, while longer hose length and restrictive nozzles reduce it.

Estimate how long to run a soaker hose to deliver the desired amount of water to a garden bed based on bed size, target watering depth, hose flow rate, and irrigation efficiency.

Estimate the amount of rainwater that can be collected from a roof based on roof area, annual rainfall, roof runoff efficiency, and first flush diversion.

Estimate the annual rainwater harvesting potential based on roof catchment area, annual rainfall, roof runoff efficiency, and number of collection surfaces. This calculator helps approximate how much rainwater can be captured per year in liters.

Estimate how much rainwater a rain barrel can collect from your roof and how many days it may meet outdoor watering needs based on rainfall, roof area, runoff efficiency, barrel size, and garden water use.

Estimate a suitable rainwater tank size based on roof catchment area, local annual rainfall, runoff efficiency, household demand, and desired storage coverage period.

Calculate the approximate water volume of a garden pond using length, width, average depth, and pond shape. Useful for estimating water capacity for liners, pumps, filters, and treatments.

Estimate the required pond liner area for a garden pond by accounting for pond length, width, depth, and extra overlap needed to secure the liner around the edges.

Estimate the recommended pond pump flow rate in gallons per hour based on pond volume, desired turnover rate, waterfall width, and total head height. This helps size a pump that can circulate the pond and support a waterfall feature.

Estimate the total lawn area a sprinkler can cover based on spray radius, arc coverage, number of sprinklers, and overlap efficiency.

Estimate the total drip irrigation emitter flow rate and watering time based on plant count, emitters per plant, emitter flow rate, and target water applied per plant.

Estimate the total flow rate required for a drip irrigation line based on line length, emitter spacing, emitter flow rate, and number of drip lines.

Estimate the total drip irrigation flow rate based on the number of emitters, emitter flow rate, operating zones, run time, and a design factor for pressure variation and system losses. Useful for sizing water supply demand and planning irrigation scheduling.

Estimate the recommended number of irrigation zones based on landscaped area, sprinkler flow rate, available water supply, planting density, and slope factor.

Estimate the required irrigation pump power based on flow rate, total dynamic head, pump efficiency, and a system allowance factor for field conditions and design margin.

Estimate recommended irrigation pipe diameter based on flow rate, pipe length, allowable pressure loss, and pipe material factor using a simplified sizing relationship for irrigation systems.

Estimate the installed cost of a lawn sprinkler system based on irrigated area, number of zones, terrain complexity, and controller type.

Estimate how long to run a sprinkler zone based on the amount of water needed, sprinkler application rate, soil type, and slope. The calculator returns recommended run time in minutes for one watering cycle.

Estimate sprinkler water usage based on sprinkler flow rate, number of sprinklers, watering duration, watering frequency, and seasonal adjustment.

Estimate sprinkler flow rate in gallons per minute based on nozzle size, water pressure, and the number of active sprinkler heads using the standard sprinkler discharge relationship.

Estimate the cost of watering a lawn or garden based on area, water applied, watering frequency, water price, and irrigation efficiency.

Calculate the approximate number of gallons represented by a given water depth over a rectangular area. Enter the water depth in inches and the area dimensions in feet, then choose the gallon type.

Calculate the total gallons needed and gallons per square foot based on area, number of coats, surface absorption, and waste factor.

Estimate the total daily water requirement for a drip irrigation system based on planting area, plant spacing, emitter flow rate, emitters per plant, and daily run time.

Estimate how long to run a drip irrigation zone based on plant water need, number of emitters, emitter flow rate, and watering frequency. The calculator determines the minutes needed per irrigation event to deliver the target weekly water volume.

Calculate how much fertilizer product to apply based on the target nutrient amount, fertilizer N-P-K analysis, application area, and spread rate basis. This helps estimate the total fertilizer needed to meet a specific nitrogen requirement across a lawn or garden area.

Estimate the daily irrigation water needed for a landscape or lawn area based on area, plant water demand, local reference evapotranspiration, irrigation system efficiency, and recent effective rainfall.

Estimate how much water your garden needs per week based on garden size, plant water needs, local rainfall, soil type, and irrigation efficiency.

Estimate weekly garden water usage based on garden size, plant water needs, local climate, irrigation efficiency, and weekly watering depth.