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Home > Green Savings Calculators

Green Savings Calculators

calculations
     We provide you with calculators to help you with your needs in the various research topics of Greencompletely.com. Here are those calculators and links back to where they are used.

 

     At Greencompletely.com we do the math. However, if you need to make calculations for your situation we provide the tools to make those calculations easy.
     These tools are green calculators and will help you find your savings and your return on investment.
     Below are those calculators. There is also a link back to the original research section they came from if you want more information. 
     Please, give them a try and let us know what you think.

Calculator From Resource Conservation - Water - Shower:

This green calculator came from Resource Conservations - Water - Shower.

Below is a calculator for your possibilities.
(click here to see how we do the calculations)

 

Current Consumption: Proposed Consumption:
Showers per day: Showers per day:
Avg. shower length (min): Avg. shower length (min):
Flow rate (gal. per min.): Flow rate (gal. per min.):
Cost to heat (per gallon)($): Cost to heat (per gallon)($):
Cost of water (per gallon)($): Cost of water (per gallon)($):
Cooler shower option (3%):
*Filled in amounts are averages. You can change any number.
Water usage cost calculator.   Water heat cost calculator.
Money to spend (shower heads, plumber service, etc.)($):
_______________________________________________________________________________________________
Is everything filled in above?
 
Results:
Yearly water consumption(g): Yearly water consumption(g):
Yearly total water costs($): Yearly total water costs($):
  
  Total annual water saving(g):
Total annual cost saving($):
Return on Investment: Months
(click here to see how we do the calculations)

 

Calculator From Resource Conservation - Electricity - Vampire:

This green calculator came from Resource Conservation - Electricity - Vampire

Calculate Return on Investment to Remove Vampires

Current Consumption:
Estimated Watts Per Hour:
Hours a Day Switched Off:
What You Pay ($/kilowatt-hour):
Money Spent on Solution($):
______________________________________________________
Is everything filled in above?
 
Results:
Yearly vampire power (kWatt-hr):
Yearly Vampire Cost ($):
  
 
Return on Investment: Months

 

Calculator From Resource Conservation - Electricity - Light Bulbs:

This green calculator is from Resource Conservation - Electricity - Light Bulbs.

Light Bulb Calculator
     Because bulbs have different life expectancies, we will calculate a daily cost of ownership based on "Initial Bulb Cost". Use the "Set Up Costs" for initial one time costs (such as an electrician or changing out a fixture). Don't forget ballast replacement in your costs. Here are some average life expectancies, you do not have to use them for your calculations:
Average life expectancies:
Bulb Type Life Expectancy(Hr) Bulb Type Life Expectancy(Hr)
Incandescent
1,000
CFL
10,000
Halogen
2,000 - 4,000
T12 Fluorescent Tubes
20,000
Metal Halide
12,000 - 20,000
T8 Fluorescent Tubes
20,000 - 30,000
High/Low Pressure Mercury Vapor
10,000 - 20,000
T8 LED Tube
35,000 - 45,000
High/Low Pressure Sodium
16,000 to 20,000
LED Bulb
25,000 to 50,000
Current Light Bulb: Replacement Light Bulb:
Life Expectancy(Hr): Life Expectancy(Hr):
Avg. Hours A Day Operation (Hr): Avg. Hours A Day Operation (Hr):
Initial Bulb Cost ($): Initial Bulb Cost ($):
Electricity Cost ($/KwHr): Electricity Cost ($/KwHr):
*Wattage Of Bulb (W): *Wattage Of Bulb (W):
Set Up Costs ($):
* Remember to include power used by ballast.
_______________________________________________________________________________________________
Is everything filled in above?
 
Results:
 
Current Light Bulb: Replacement Light Bulb:
Bulbs Used Yearly: Bulbs Used Yearly:
Yearly Power Usage (KwHr): Yearly Power Usage (KwHr):
Yearly Power Costs($): Yearly Power Costs($):
1Total Yearly Costs($): 1Total Yearly Costs ($):
1 Does not include your labor costs to change bulbs.
Yearly Power Savings (KwHr):
Yearly Cost Savings ($):
Return on Investment: Years

Calculator From Resource Conservation - Water - Sink:

This green calculator is from Resource Conservation - Water - Sink.


Calculate waste water from sink.
Drip Calculator (Repair Leaky Sink)
(Small Leak) Drop Per Minute: (Big Leak) Cups Per Hour:
Drops Per Minute: Cups Per Hour:
% Heated Water (%): % Heated Water (%):
Cost To Heat Gallon Water ($): Cost To Heat Gallon Water ($):
Repair Cost ($): Repair Cost($):
Cost Of Water (per gallon)($): Cost Of Water (per gallon)($):
*Filled in amounts are averages. You can change any number.
Water usage cost calculator.   Water heat calculator.
_______________________________________________________________________________________________
Is everything filled in above?
 
Results:
Yearly Water Waste (g): Yearly Water Waste (g):
Yearly total water costs($): Yearly total water costs($):
Return on Investment (Months): Return on Investment (Months):
______________________________________________________________________________

Flow Rate Calculator (Aerators And Water Conserving Faucets)
Current Sink: Proposed Change:
Current Flow (gpm): Proposed Flow (gpm):
% Heated Water (%): % Heated Water (%):
Cost To Heat Gallon Water ($): Cost To Heat Gallon Water ($):
Average Time Running/Day (Min): Average Time Running/Day (Min):
Cost Of Water (per gallon)($): Cost Of Water (per gallon)($):
Cost To Change Make Change ($):
*Filled in amounts are averages. You can change any number.
Water usage cost calculator.   Water heat calculator.  
_______________________________________________________________________________________________
Is everything filled in above?
 
Results:
Yearly Water Use (g): Yearly Water Use (g):
Yearly Total Water Costs ($): Yearly Total Water Costs ($):
Yearly Water Savings (g):
Yearly Water Cost Savings ($)
Return on Investment (Months)
______________________________________________________________________________

This green calculator is from Resource Conservation - Water - Sink.

Calculator From Resource Conservation - Water - Toilet:

This green calculator is from Resource Conservation - Water - Toilet.


Calculate Feasibility Replacing Toilet
Current Toilet: Proposed Toilet:
Current Flow (gal/flush): Proposed Flow (gal/flush):
Estimated Flushes Per Day: Estimated Flushes Per Day:
Cost Of Water Per Gallon($): Cost Of Water Per Gallon ($):
Cost To Replace Toilet ($):
Rebate ($):
Find possible rebates here.
*Filled in amounts are averages. You can change any number.
Don't know what your water costs? Try our calculator
_______________________________________________________________________________________________
Is everything filled in above?
 
Results:
Yearly Water Use (g): Yearly Water Use (g):
Yearly Total Water Costs ($): Yearly Total Water Costs ($):
Yearly Water Savings (g):
Yearly Water Cost Savings ($)
Return on Investment (Years)
______________________________________________________________________________

This green calculator is from Resource Conservation - Water - Toilet.

Calculator From Resource Conservation - Heat - Water Heaters:

This green calculator is from Resource Conservation - Heat - Water Heaters.

 

Calculators For Hot Water Heating:

Useful information for calculators:

Temperature Map
This is a basic map of water temperatures across the nation. Click on it to see an average in your area (EPA Site).
Typical elements for Water heater (electric): 1,500 Watt, 2,000 Watt, 3,000 Watt, 3,800 Watt, 4,500 Watt and 5,500 Watt.

1 Therm is approx equal to 100 CCF of Gas. Slight difference between natural gas and propane.

Most water heaters are set to 120 deg F from the factory (but you can adjust them).

See how we Make the calculations.
Water Heat Cost Calculator:

Water Heat Cost Calculator

ELECTRICITY:
Water Inlet Temp (F) Hot Temp Setting (F)
Efficiency Factor (EF) Cost Per KWHR ($)
Results:
Shower Water (100 F) $/gal Warm Water Cycle (40% hot water) $/gal
Faucet Water (50% hot water) $/gal Dishwasher (100% hot water) $/gal

________________________________________________

GAS:
Water Inlet Temp (F) Hot Temp Setting (F)
Efficiency Factor (EF) Cost Per Therm ($)
Results:
Shower Water (100 F) $/gal Warm Water Cycle (40% hot water) $/gal
Faucet Water (50% hot water) $/gal Dishwasher (100% hot water) $/gal

See how we Make the calculations.

Average Hot Water Recovery Rate:

Average Hot Water Recovery Rate

ELECTRICITY:
Water Inlet Temp (F) Hot Temp Setting (F)
Recovery Efficiency Heating Element Wattage
Results:
Recovery Rate hotgal/hour This is for your set of conditions (industry standards report based on a 90 deg F temperature rise).

________________________________________

GAS:
Water Inlet Temp (F) Hot Temp Setting (F)
Recovery Efficiency (0.76 to 0.78 or for high efficiency 0.94) Heating Element BTU/Hour
Results:
Recovery Rate hotgal/hour This is for your set of conditions (industry standards report based on a 90 deg F temperature rise).

See how we Make the calculations.

How Many Showers Can We Take Before They Are Cold?

How Many Showers Can We Take Before Running Out Of Hot Water?

To determine back to back showers possible with a small wait time, enter the information below (use winter inlet temperature typically 5 to 15 deg F cooler than your average). We suggest you measure your shower head flow rate before you make this calculation. We assume shower is 100 deg F and no other hot water use during this period.

ELECTRICITY:
Water Inlet Temp (F) Hot Temp Setting (F)
Recovery Efficiency Heating Element (Watts)
Showerhead Flow Rate (gal/min) Time for each Shower (min)
Wait time between showers (min) Tank Capacity (gallons)
 
Results:
Recovery Rate hotgal/hour Showers*
* Negative numbers mean infinite showers
 
GAS:
For those with gas water heaters, use 6900 Watts in the "Heating Element" box to estimate for a 30,000 BTU/HR gas burner. 9200 Watts for 40,000 BTU/HR. 11500 Watts for 50,000 BTU/HR.

See how we Make the calculations.

Standby Power Cost:

Standby Power Cost

We calculate the power loss based on a simple model. Pipes, valves, connections and other factors cause additional heat loss. We have doubled the theoretical loss to estimate a range of power loss.

Average Room Temperature (F) Hot Temp Setting (F)
Diameter Of Tank (inches) Height Of Tank (inches)
R-Value Of Heater (5 - 25) Efficiency(.99 electric or .78 gas or .94 for high eff. gas)
Electricity Rates ($/KWHR) Gas Rates ($/Therm)
Results:
Electricity: Gas:
Heat Loss KWHR/Day to Heat Loss Therm/Day to
Heat Loss KWHR/Year to Heat Loss Therm/Year to
Standby Cost ($/Year) to Standby Cost ($/Year) to
 

See how we Make the calculations.

Water Heater Size:

Water Heater Size

When figuring out the water heater size, consider all the changes that have happened and may happen in your household. If you have changed out showerheads and faucet aerators, then chances are you may not need as big of a water heater. Please, measure your devices before you make these calculations.
     Conventional wisdom is to look at your peak 1 to 2 hours of hot water usage during a day. Consider how many showers, loads of wash, loads of dishes, and total sink use during that peak time. In addition, we ask that you look at what is realistic and common usage (not the usage you might see once a year). Then, we ask you to consider some wait times between those events. You will be surprised just how big an effect a few minutes can have. To calculate the peak tank size, we assume water heating in the winter months.
For this calculation we assume shower use first. We assume faucet use throughout the two hours. Then, if the washing machine and/or dishwasher are used you will wait a small amount of time after showers to use them. You may also set a wait time after the dishwasher to start the clothes washer. If you set the wait times to 0, that will mean you start the dishwasher immediately after the last shower and start the clothes washer at the same time as the dishwasher. By changing wait times and other entries you can see the effect on your "best fit" water heater.
     Here we assume: Showers are 100 deg F, Sink use is 60% hot water, Dishwasher is 100% hot water, Warm cycle on Clothes washer is 40% hot water, Hot cycle on clothes washer is 100% hot water. This calculator ignores leaks and pipe heat loss.

2 Hour Peak Hot Water Usage
 
Water Inlet Temp (F) Hot Temp Setting (F) Gas Recovery Efficiency
 
Showers During 2 hours?
Showerhead Flow Rate (gal/min) # Of Showers Time Per Shower (min) Wait Time Between Showers (min)
 
Faucet Use During 2 Hours?
Kitchen Faucet Use (min) Kitchen Faucet Flow Rate (gal/min) Other Sink Use (min) Other Sink Flow Rate (gallon/min)
 
Dishwasher Used During 2 Hours?
Wait Time After Showers (Min)
1 Load Size Mode?
 
Clothes Washer Used During 2 hours?
Wait Time After Showers And Dishwasher Start (Min) Washer Type
1 Load Size Of Tub (cubic Feet) Cycle Temperature
 
Results:
The numbers represent the number of usable gallons left after each event (showers, dishes, clothes). Red = "undersized". Green = "best fit". Pink = "oversized".
Electricity: Gas:
Shower Dishes Clothes Shower Dishes Clothes
1. 10 Gal. 1,500W Element 1. 30 Gal. 30kBTU/HR
2. 15 Gal. 1,500W Element 2. 40 Gal. 35kBTU/HR
3. 20 Gal. 1,500W Element 3. 40 Gal. 40kBTU/HR
4. 20 Gal. 2,000W Element 4. 50 Gal. 40kBTU/HR
5. 20 Gal. 3,000W Element 5. 50 Gal. 50kBTU/HR
6. 30 Gal. 3,800W Element 6. 65 Gal. 60kBTU/HR
7. 30 Gal. 4,500W Element 7. 75 Gal. 70kBTU/HR
8. 40 Gal. 3,800W Element
9. 40 Gal. 4,500W Element If you own a standard top loading clothes washer and wash in "hot", the minimum water heater is a 50 gallon during non-peak time.

If you take a normal bath, the absolute minimum tank size should be about 30 gallon (for a tank that is completely up to temperature). 40 gallon would probably do a better job.
10. 40 Gal. 5,500W Element
11. 50 Gal. 4,500W Element
12. 50 Gal. 5,500W Element
13. 80 Gal. 4,500W Element
14. 80 Gal. 5,500W Element
 

See how we Make the calculations.

This green calculator is from Resource Conservation - Heat - Water Heaters.

Calculator from (Coming Soon):

Calculator from (Coming Soon):

These calculators are for informational purposes only. Your results may vary.