Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Water Heater Efficiency Calculator

Estimate your monthly water heating cost in dollars based on hot water usage, temperature settings, heater efficiency, and energy price. Use it to compare operating costs before upgrading to a more efficient unit.

Daily Hot Water Usage (gallons)

Incoming Water Temperature (°F)

Target Hot Water Temperature (°F)

Water Heater Efficiency

Energy Cost ($/kWh or $/therm)

Fill in the required fields to see your result.

Water Usage

Garden Irrigation Water Calculator

Calculate the daily gallons needed to irrigate your lawn or garden based on area, plant type, climate zone, system efficiency, and watering frequency. Helps optimize schedules and reduce water waste.

Area Size (sq ft)

Plant Type

Climate Zone

Irrigation System Efficiency

Watering Days per Week (days)

Fill in the required fields to see your result.

Key differences

	Water Heater Efficiency Calculator	Garden Irrigation Water Calculator
Category	Water Usage	Water Usage
Inputs required	5	5
Result	Monthly Heating Cost ($)	Weekly Water Needed (gallons)
What it does	Estimate your monthly water heating cost in dollars based on hot water usage, temperature settings, heater efficiency, and energy price. Use it to compare operating costs before upgrading to a more efficient unit.	Calculate the daily gallons needed to irrigate your lawn or garden based on area, plant type, climate zone, system efficiency, and watering frequency. Helps optimize schedules and reduce water waste.