All Calculators

Household Energy is evaluated from Monthly Electricity, Monthly Natural Gas and Annual Heating Oil. The calculation reports Total Annual Energy, Total Annual CO₂ Emissions and Estimated Annual Energy Cost.

Rainwater Harvesting is evaluated from Roof Catchment Area, Annual Rainfall and Roof Surface Type. The calculation reports Annual Collection Potential, Average Monthly Collection and Recommended Tank Size.

Solar Hours is evaluated from US Region / City and Solar System Size. The calculation reports Peak Sun Hours per Day, Daily Solar Production and Annual Solar Production.

Cooling Cost is evaluated from Home Size, Annual Cooling Degree Days and AC SEER Rating. The calculation reports Annual AC Energy Use, Annual Cooling Cost and Peak Month Cost.

Flight Carbon is evaluated from Flight Distance, Cabin Class and Number of Passengers. The calculation reports Total CO₂e Emissions, Per Person Emissions and Carbon Offset Cost.

Irrigation Water is evaluated from Lawn/Garden Area, Climate Zone / Evapotranspiration and Plant Type. The calculation reports Weekly Water Needed, Monthly Irrigation Water and Estimated Monthly Irrigation Cost.

Solar Payback Period is evaluated from System Cost, Annual Electricity Savings and Federal Tax Credit. The calculation reports Net System Cost, Simple Payback Period and 25-Year Net Savings.

Diet Carbon is evaluated from Beef Servings per Week, Chicken Servings per Week and Fish / Seafood per Week. The calculation reports Annual Diet Emissions, Annual Emissions and Diet Category.

Home Energy Audit is evaluated from Home Size, Annual Heating Degree Days and Annual Cooling Degree Days. The calculation reports Annual Heating Cost, Annual Cooling Cost and Annual Water Heating Cost.

Wind Turbine Power is evaluated from Rotor Diameter, Average Annual Wind Speed and Capacity Factor. The calculation reports Swept Area, Estimated Rated Power and Annual Energy Output.

Battery Storage is evaluated from Daily Home Electricity Use, Target Backup Duration and What to Power During Backup. The calculation reports Battery Capacity Needed, Tesla Powerwall 3 Units and Estimated Battery System Cost.

Car Emissions is evaluated from Miles Driven per Year, Fuel Economy and Fuel Type. The calculation reports Annual CO₂ Emissions, Estimated Annual Fuel Cost and vs. Average EV on US Grid.

Heat Pump COP is evaluated from Outdoor Temperature, Heat Pump Type and Natural Gas Rate. The calculation reports Heat Pump COP at This Temperature, Heat Pump Cost per MMBtu and Gas Furnace Cost per MMBtu.

HVAC SEER is evaluated from Current AC SEER Rating, New AC SEER Rating and AC System Size. The calculation reports Old AC Annual Energy Use, New AC Annual Energy Use and Annual Savings.

Solar Battery Bank Size is evaluated from Daily Energy Consumption, Days of Battery Backup and Depth of Discharge. The calculation reports Total kWh Needed, Required Usable Capacity and Required Gross Battery Capacity.

Basic Probability is evaluated from Favorable Outcomes, Total Possible Outcomes and Favorable Outcomes. The calculation reports P, P as% and P Complement.

Mean is evaluated from Number 1, Number 2 and Number 3. The calculation reports Count, Sum and Mean.

Sample Size is evaluated from Confidence Level, Margin of Error and Expected Proportion. The calculation reports Required Sample Size and Adjusted n.

Conditional Probability is evaluated from P - Joint Probability, P - Probability of Event B and P - Probability of Event A. The calculation reports P - Probability of A given B, P as% and P - using Bayes.

Margin of Error is evaluated from Sample Size, Confidence Level and Sample Proportion. The calculation reports Margin of Error, Confidence Interval Lower and Confidence Interval Upper.

Median is evaluated from Number 1, Number 2 and Number 3. The calculation reports Count, Median and Mean.

Spearman Rank Correlation is evaluated from X1, Y1 and X2. The calculation reports Spearman rs, Number of Pairs and Interpretation.

Mode is evaluated from Number 1, Number 2 and Number 3. The calculation reports Mode, Modal Frequency and Distribution Type.

R-Squared is evaluated from Actual Y1, Predicted Ŷ1 and Actual Y2. The calculation reports R-Squared, Variance Explained and SS Residuals.

Range is evaluated from Number 1, Number 2 and Number 3. The calculation reports Minimum, Maximum and Range.

T-Test is evaluated from Sample Mean, Hypothesized Population Mean and Sample Standard Deviation. The calculation reports t-Statistic, Degrees of Freedom and Standard Error.

Poisson Distribution is evaluated from Average Rate - mean number of events in interval and Number of Events. The calculation reports P - Exactly k events, P - At most k events and P - At least k events.

Exponential Distribution is evaluated from Rate Parameter - events per unit time and Time Value. The calculation reports P - Probability within time x, P - Probability beyond time x and Mean.

Dice Roll Probability is evaluated from Number of Dice, Faces per Die and Target Sum. The calculation reports P, P as% and Total Outcomes.

Lottery Odds is evaluated from Lottery Game, Pool Size and Numbers to Pick. The calculation reports Jackpot Odds, Probability and Expected Value per $1 ticket.