26 calculators
Insulation & Energy Calculators
Calculate R-values, insulation thickness, and energy savings for your roof. All tools are free — no registration or download required.
Roof Insulation Calculator
Calculate insulation thickness and R-value needed for your climate zone
intermediate Attic Insulation Calculator
Calculate how much insulation to add to your attic for optimal efficiency
basic Roof Skylight Energy Calculator
U-factor annual heat loss: Q = U × A × 24 × HDD. Annual energy cost. SHGC solar gain estimate and net energy impact. ENERGY STAR compliance check for U-factor and SHGC.
intermediate R-Value Calculator
Calculate total R-value for multi-layer roof and attic assemblies
intermediate Metal Roof Color & Heat Calculator
Compare surface temperatures and cooling cost impact across metal roof colors using Solar Reflectance Index (SRI)
basic Ice Melt Cable Calculator
Calculate heat cable length for roof edges — zigzag pattern on eave, gutter run, downspout length, wattage, and circuit sizing
intermediate Roof Dead Load Calculator
Calculate total permanent dead load (psf) from each roof assembly layer — sheathing, covering, underlayment, insulation, and framing
intermediate Roof Ice Dam Prevention Calculator
Multi-factor ice dam risk score from R-value, ventilation, ice shield, and climate zone — risk level and prevention cost estimate
intermediate Roof Attic Bypass Sealing Cost Calculator
Total bypasses × $5–$15 each — foam cans, sealing time, total cost, and estimated annual energy savings from air sealing top plate holes, recessed lights, and penetrations.
basic Roof Energy Savings Calculator
Calculate annual energy savings from roof insulation and material upgrades
intermediate Ice Dam Risk Calculator
Assess your ice dam risk level based on insulation R-value, ventilation, pitch, and climate zone
basic Skylight Natural Light Calculator
Calculate optimal skylight size for natural daylighting — the 3-5% floor area rule with energy savings estimate
basic Cathedral Ceiling Insulation Calculator
Calculate insulation for vaulted ceilings — spray foam, rigid board, or batts with ventilation channel requirements
intermediate Tapered Insulation Calculator
Calculate flat roof tapered insulation — slope direction, board counts, average R-value, and adhesive for proper drainage
advanced Roof Energy Code Calculator
IECC 2024 minimum R-value and maximum U-factor by climate zone 1–8 for vented attics and cathedral roofs — compliance check with additional insulation needed
basic Roof Cathedral Vent Channel Calculator
IRC R806.3 compliance: min 1" vent channel. Baffle count = rafter bays. Total baffle LF. R-value loss from channel (~0.9 per inch) and net achievable insulation R-value.
intermediate Roof Heat Loss Calculator
Calculate heat loss through your roof and potential energy savings
advanced Cool Roof Calculator
Calculate energy savings from reflective cool roof coatings
intermediate Spray Foam Roof Calculator
Calculate spray foam insulation coverage and cost for roof applications
intermediate Roof Condensation & Dew Point Calculator
Determine if your roof assembly is at risk of condensation based on temperature gradient and humidity
advanced Roof Thermal Bridging Calculator
Calculate effective R-value reduction from steel purlins or wood rafters — typical 30-50% R-value loss
advanced Metal Roof Thermal Expansion Calculator
Calculate expansion and contraction in metal panels by material type (steel, aluminum, copper, zinc), panel length, and temperature range
intermediate Roof-to-Floor Ratio Calculator
Calculate the ratio of roof area to floor area — key metric for energy modeling, code compliance, and building efficiency
basic Wind-Driven Rain Calculator
Calculate rain penetration risk by wind speed, roof pitch, and overhang — determines underlayment and flashing upgrades
intermediate Roof Moisture Barrier Calculator
Select vapor retarder class (I/II/III) by climate zone per IBC Table 1405.3.2 — calculate area with overlap allowance
intermediate Radiant Barrier Calculator
Calculate energy savings from installing a radiant barrier in your attic
intermediate About Insulation & Energy
This category contains 26 specialized calculators covering all aspects of insulation & energy. Whether you are a homeowner planning a project or a roofing contractor estimating materials, these tools give you accurate results based on industry-standard formulas.
Each calculator includes step-by-step guidance, example calculations, and explanations of the underlying formulas so you understand exactly how your numbers are derived. Results are suitable for budgeting and planning — always consult a licensed roofing professional before starting structural work.
How to Use These Calculators
Start by entering your roof's basic dimensions. Most calculators need length, width, and pitch at minimum. Results update instantly as you type. Use the unit toggle to switch between imperial (feet, inches) and metric (meters) measurements. All calculators are mobile-friendly and work on any device.