All Tools

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AAMASKY Skylights and Daylighting (Fee-based)
Heating, cooling, and lighting energy consumption attributable to skylights in commercial buildings

Adeline
Analyze daylighting and lighting in commercial buildings

AGI32
Software for design and renderings for electric and daylighting analysis

AGi32 Lighting Design Software (fee-based)
Lighting analysis software

ApacheLoads (fee-based) (UK)
Performs heat loss and heat gain design calculations

APOS Photovoltaic StatLab
Analysis and the quality assessment of photovoltaic (PV) modules

ArchiPhysics Daylight Software (Free)
Shows how daylight will be distributed in a room

ArchiPhysics Passive Solar Software (Free)
See how different variables affect the indoor temp

ArchiPhysics-Daylight
How daylight is distributed in a room

Awnshade
Window shading design and analysis software

Build It Solar
This website provides a selection of analysis tools and data for solar design

Building Energy Software Tools Directory
Alphabetical list of tools

CASAnova 3.3 (free download)
Software for heating and cooling energy demand in buildings

Chhaya 2.0
Optimize glazing size and orientation, shading and natural ventilation

Climate Consultant
Energy Design Tool

CoDePro -- Flat Plate Collector Design Program
University of Wisconsin Madison

Collector Efficiency Calculator
from Build It Solar

COMFEN 2.1 beta
Alternative fenestration systems for project-specific commercial building applications

Commercial Water Calculator
Water use in commerical buildings

Data Plotting Program
Chart data gathered from monitoring stations

Degree Day Charts - Free
from Weather Data Depot

Degree Days Calculator for IPM (California)
You can run preset models

Degree Days Charts (Global)
Weather data for energy professioanls

Design Advisor MIT (USA)
Daylighting, natural ventilation, energy and comfort.

Design Builder Software (fee-based)
Building energy, CO2, lighting and comfort performance

DOE-2
Calculates the hourly energy use and energy cost

E-Quest Energy Simulation Tool
Building energy use analysis tool

E-Scale or EnergySmart Home ScaleSM
Home energy rating tool from USDOE

Eco-Specifier (FEE-Based)
Database of 3500 eco-products, eco-materials, technologies and resources

EcoCalculator for Buildings from the Athena Instit
Evaluate buildings & assemblies using life cycle assessment (LCA) methodology

EcoTect Design Tools (Fee-based)
from Autodesk

Electric Load Estimate Worksheet
Worksheet to calculate load

Emissivity of Materials Chart
Paints, coatings, metals, masonry, etc.

Energy CAP (Fee-Based)
Utility bill tracking software

Energy Gauge
Energy and Economic Analysis Software for Commercial and Residential

Energy Modeling Software Tools Directory (USA)
Directory of building energy and water use computer modeling tools with links

Energy Plus Energy Simulation Software
Free downloadable tool

Energy Star Home Energy Yardstick (USA)
Compare a home's energy efficiency to similar homes

Energy-10 Energy Simulation Software (fee-based)
Analyzes and illustrates a building's energy and cost savings

Environmental Impact Estimator for Buildings from Athena
Evaluates buildings & assemblies using life cycle assessment (LCA) methodology

Free Energy Modeling Software
Google SketchUp

Fuel Comparison Calculator
from Build It Solar

Green Flight Carbon Offset Calculator (Australia)
Offset travel via airplane

Greenius (German - free download)
Renewable energy evaluation

H2O Conserve Calculator
How much you use and how to conserve water, not just at home

Heat Gain and Loss Short Form Calculator
Quick residential calculator for MrHVAC

HEED Free Software (USA)
Home Energy Efficient Design

Home Energy Efficient Design (HEED)
Free downloadable tool

Home Energy Saver
Do-It-Yourself Energy Audit Tool

Home Energy Saver (USA)
Do It Yourself Home Energy Audit

Home Heat Loss Calculator (USA)
Estimate of the heat loss for your home

HOMER (free registration)
Off-grid and grid-tie simulation software

Horizon (fee-based - Germany)
Das HorizON Prinzip

How Many Solar Panels Do You Need Calculator?
Calculate how many solar panels you need

In My Backyard (USA)
Estimates electricity you can produce with PVs at your site

INsel (fee-based)
Graphical programming language for simulation of renewable energy systems

Landscape Calculators
Amount of mulch, plants, stone or lawn

LESO ACOUSALLE (Fee-based)
Planning and Analysis of Acoustics of Indoor Spaces

LESO-Cool (fee-based)
Cooling through Natural Ventilation and Thermal Movements

LESO-Daylighting (Fee-based)
Daylighting design software

Lighting Pay-Off Calculator
Incandescents vs fluoresecents

Louver Shading Tool
from Sustainable by Design

Measurement and Instrumentation Data Center (USA)
Irradiance and Meteorological Data

MeteoNorm (fee-based Global)
Meteorological database for solar energy

Michigan Wind Prospecting Tool (USA)
Best areas in Michigan for utility scale wind farm development and community wind development

NASA World Wind Tool
World Wind SDK for Java

National Climatic Data Center (USA)
World's largest active archive of weather data

National Green Values™ Calculator
Compare low impact development to conventional stormwater partices

Off-Grid Energy System Size Calculator
Calculate size of your home power system

Online Wind Calculator (Maryland, USA)
Figure out wind resources for your site in maryland

Panel Shading Visualization Tool
Shading of parallel rows of flat solar collector panels

Parasol (Sweden)
Energy simulation tool for comparison of energy demand

PGE Smart Energy Analyzer
Analyze a home's energy consumption (PGE customers)

Photovoltaic Power Model Software
Free software to evaluate for photovoltaics

Photovoltaic: PV CoSim+
PV cost simulation software

Pilkington Sun Angle Calculator
Determining solar geometry variables for architectural design

Planning Tree Windbreaks (Missouri, USA)
Using windbreaks fro energy efficiency

Psychrometric Chart from Trane
Downloadable

Psychrometrics Calculator for Air Properties
from Trane

Psychrometrics Calculator for Mixed Air Properties
from Trane

PV F-Chart Software (fee-based)
PV system design and analysis

PV Professional (German/Italian - fee-based)
PV planning for flat or sloped roofs

PV WATTS Calculator v 1.0
calculates electrical energy produced by a grid-connected photovoltaic (PV) system

PV WATTs Version 2
Estimates performance data for any location in the United States

PV-Sol Software for Photovoltaics (fee-based)
Simulation for design and calcs of grid-connected systems

PVCad Design Software for PV Facades
Computer tool for fast and efficient planning of PV facades

PVGIS Estimation Utility (Europe)
Estimate solar electricity generated in European city or country

PVsyst (fee-based)
Photovoltaic system analysis

R-Values Table for Materials
Average R-value for many building materials

Rain Xchange Rainwater Design Calculator (USA)

Rainwater Collection Calculator

Rainwater Collection System Sizing
Determine catchment area and water use demand

Rainwater Harvesting Calculator (Seattle WA)
Calculate your size requirements for Seattle rainfall

Rainwater Harvesting Calculator (UK)
Calculate your rainwater collection system size

Rainwater Harvesting Calculator for Texas, New Mexico, Arizona
Online calculator for catchment area, storage and landscape use

RESFEN 5.0
Windows and Daylighting Software

RETScreen Clean Energy Analysis Software
Evaluate energy production for various types of renewable energy

ROI Analysis for SOLR Roofing Panels (FREE)
Detailed look at costs and benefits for SOLR panels

Roof Ray Solar Potential Calculator
Calculate your roof's solar potential

Shadow Analyzer (fee-based)
Analyzes shadow effects of solar equipment or nearby objects

Shadows (free for basic level)
Software to design sundials and astrolabes

Sizing Solar Pool Heaters (Florida, USA)
Simple method to determine solar collector area

Sizing Solar Water Heater Tool (Florida, USA)
Residential solar hot water systems

SketchUp (Free)
Create 3-d models using GoogleEarth.

SkyCalc Software Tool for Skylighting
Determine the optimum skylighting strategy

Small Wind Toolbox
Installation, operation, approval, markets, zoning, etc.

SMARTS - Simple Model of the Atmospheric Radiative Transfer of Sunshine
Predicts clear-sky spectral irradiances

Sol Path Sun Path Calculator
from Sustainable by Design

SolaCalc (UK)
Passive solar design performance simulation

Solar Air Heater Software and Data
Evaluate energy production for solar air heating projects

Solar Analysis Widget (USA)
Online tool to see your solar power potential

Solar Array Size Calculator
Calculate solar array size from SRoeCo

Solar Battery Bank Designer
Design tool to show how to wire battery bank

Solar Calculator (USA)
Estimate size and cost of solar power system in USA

Solar Calculator (USA)
Calculate amount of electricity from sun

Solar Collector Design Program
Compute efficiency of your own solar collector design

Solar Cost Calculator
Calculate your solar costs from SRoeCo

Solar Design Tool for Grid-Tie Systems
Design and configure optimal solar power systems

Solar Energy Electric Power System Simulator
Demonstrate the basic operation of a solar electric power system

Solar Energy System Sizing Estimator
How many Solar Panels you will need to generate electricity?

Solar Estimator (USA)
Estimates size and calculates the cost of solar system

Solar Noon Calculator Printable (Global)
Find the exact time of solar noon for your location

Solar Panel Shading Calculator
from Sustainable by Design

Solar Pathfinder-Solar Site Analysis (Fee)
On-site accurate measurement of shading of any site

Solar Position Calculator
Solar zenith angle, declination, equation of time, etc.

Solar Position Calculator by NOAA (Global)
Find sunrise, sunset, solar noon for anyplace on earth

Solar Power Calculator (USA)
Estimate the cost and size of a solar energy project

Solar Power Forecasting (fee-based)
Focuses on short-term markets

Solar Power Rating Map (USA)
Estimates net cost for a solar power system for each state

Solar Radiation Data Manual for Buildings
Free, downloadable data tables for calculating sol

Solar Radiation Data Manual for Buildings (USA)
for a horizontal window and four vertical windows

Solar Radiation Data Manual Online (USA)
for Flat-Plate and Concentrating Collectors

Solar Rating (Canada and USA)

Solar ROI Calculator
A return on investment calculator for roof panels

Solar Savings Calculator for Residential (USA)
Calculate savings for using the REnu solar rental

Solar Site Survey (USA)
One-page solar resources map fro US

Solar Sizer
Solar system sizing tool

Solar Water Heater Calculator
Explore the energy usage of your water heater

Solar Water Heater Software
Evaluation tool for solar water heating global

Solar Water Heating Calculator
explore the energy usage of your water heater

SolArch (UK)
Soalr Architecture Design Tool

SOLinvest Pro (German - fee-based)
Economic analysis of renewable energy systems

SOLinvest Standard (German - fee-based)
Basic economic analysis of renewable energy systems

SolPath Tool
graphical representation of the sun's apparent path

Sombrero 3.01 (Germany)
Solar shading, radiation, systems and building geometry

SPOT Sensor Placement Optimization Tool
spreadsheet-based tool for specific photosensor manufacturers

SRoeCo Solar
Solar panel comparisons, costs, array size calculators

String Sizing Program for Photovoltaics
Approximate PV module string sizes

Sun Angle Tool
Calculates solar angle data

Sun Eye (fee-based)
Accurately measure solar access and shading

Sun Path Chart Program
Sun path charts in Cartesian coordinates

Sun Position Calculator
Calculates an array of solar angle data

Sun Position Tool
Calculates an array of solar angle data

SunAngle Calculator
Solar angles based on location, date, and time

SunAngle Professional Suite
Sophisticated version of SunAngle

Sundi (Germany)
Simulation program for irradiance calcs and shading analysis

Sundial
Make a Paper Sundial

Sundial Registry
Photos, locations and descriptions of sundials all over the world

Sundial.net
Online web resource for sundials

SunPower Estimator (USA)
Calculates 25-year savings from solar electricity

SUNREL
Energy simulation software

Sunrise/Sunset Calculator (USA)
for any location and any date

Sustainability Toolkit (Free, Online)
Developed by US Air Force with many strategies

Sustainable By Design
Design tools online for solar

Sustainable Measures (North America)

T-Sol Professional (fee-based)
Simulation for design of solar thermal systems

Terra Org Carbon Calculator (Spanish)
de emisiones de carbono emitidas a la atmósfera

Therm
Model two-dimensional heat-transfer effects in building components

Trane TRACE 700 (fee-based)
Optimize the design of building’s HVAC based on energy utilization & LCA

Transit Benefit Calculator (USA)
Measure the benefits of transit investments for communities

TRNSYS
Transient systems simulation program

Vertical Fin Shading Tool
calculate the shading provided by vertical fins

Video Conferencing Calculator
Travel meeting versus video conferencing

Virtual Wind Tool (fee-based)
3D wind flow modeling and visualization

Voltage Drop Calculator Tool
approximate voltage rise in the AC circuit

Water Budgets Water Use Calculator
How much water does your home use?

Water Calculator (UK)
What's your water use per day?

Water Consumption Calculator
Where and how much water do you use?

Water Footprint Extended Calculator
How much water do you use based on the products you consume?

Water Meter Calculator (UK)
Calculate your savings from installing a water meter

Water Neutral Offset Calculator
Travel to South Africa in a water-neutral way

Water Usage Calculator (Thames, UK)
Calculate your home water use

Water Usage Calculator for Cooling Towers
Calculate water useage for cool towers

Water Use Calculator
Find your water use patterns at home

Water Use Calculator (Australia)
Home water use calculator for Australia

Water Use Calculator Commercial Buildings
Estimate your building's water usage

Water Use Calculator Fair Oaks
Find out your water use at home

Water Use Calculator SWFMD
Find how much water you use at home

Wind Chill Calculator

Wind Energy Finance Calculator (USA)

Wind Estimator (USA)
Estimates size and calculates the cost of wind system

Wind Power Prediction Tool (fee-based)
Generate short-term predictions of wind power production

Wind Project Calculator (USA)
Cash flow modeling for community wind projects

Wind Propespecting Tools (Fee-based)
Calculate wind potential at your site

Wind Turbine Software
Evaluate wind power

Wind Yield Estimation Tool (UK)
Estimate the local annual mean wind speed

WindCast Forecasting Tool
Current wind speed and direction for the most recent hour

Window 5.2
Calculate total window thermal performance

Window Heat Gain Calculator
Calculates the solar heat gain through vertical windows in temperate

Window Overhang Analysis Tool
Visualize the degree to which a horizontal overhang shades a window

Window Overhang Design Tool
Visual feedback about the performance of a horizontal window overhang

Wire Size Calculator
Proper sizing of wires for solar panel-to-battery