Smart Insulation Calculator
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About this app
Every R-value number. One app. Works offline.
Smart Insulation Calculator is a 34-calculator estimating toolkit for insulation contractors, energy auditors and weatherization crews - and straightforward enough for a homeowner doing their own attic. No sign-in, no account, and no signal required. It all runs on your phone, which matters when you are standing in a crawl space.
WHY IT IS DIFFERENT
Nobody buys "some insulation". You buy enough to hit a target R-value. So every quantity in this app follows the same visible chain:
Target R-49 → cellulose R-3.5/in → 14.0 inches → 1,000 sq ft → 40 bags
You see the reasoning, not just the answer, so you can show a customer why the number is the number. Switch material and the whole chain re-runs.
THE ENVELOPE
✓ Wall batt calculator - net of windows and doors, batt width from stud spacing
✓ Attic blown-in - bags off the coverage chart at depth, with cellulose settling
✓ Attic batts and rolls - first layer in the bays, second cross-laid over the joists
✓ Cathedral and vaulted ceilings - what R actually fits, minus the vent gap
✓ Floor and crawl space batts - including the support wires that hold them up
✓ Crawl space encapsulation - wall board, ground barrier, seam tape, fasteners
✓ Basement walls - rigid board against concrete plus a framed wall inside it
✓ Rim and band joist - cut board per bay, or spray foam by the board foot
✓ Dense-pack retrofit - pounds and bags by density, plus drill holes per bay
✓ Garage and bonus room - walls, ceiling and door kit as one aggregated job
MATERIALS AND BARRIERS
✓ R-value stack - add layers, get total R and U for the whole assembly
✓ Climate zone lookup - code minimums by IECC zone, assembly and code year
✓ Spray foam - board feet, open cell against closed cell, DIY kits or bulk
✓ Rigid foam board - sheets, seam tape, adhesive, with the polyiso cold derate
✓ Mineral wool, radiant barrier, vapour barrier - including which side it goes on
✓ Attic ventilation - net free area, soffit and ridge split, baffle count
✓ Duct and pipe insulation, plus a soundproofing assembly
PERFORMANCE AND ENERGY
✓ Air sealing kit - caulk, foam, gaskets and covers for the highest-return step
✓ Heat loss and BTU - conductive loss per surface, so you know what to fix first
✓ Savings and payback - before and after R, estimated annual saving, payback
✓ Cost per R - which material is genuinely the cheapest path to your target
✓ Existing R estimator - measure what is there, see the gap to code in one tap
✓ Removal estimating and a 25C-style tax credit checker
COSTS AND QUOTING
✓ Labour by square foot, hour or bag, with an honest attic-access factor
✓ Material cost against your own saved price book
✓ Markup and margin - and the difference between them, which costs people money
✓ Customer quotes, PDF export, shopping lists and quoted-against-actual tracking
WHO IT IS FOR
Insulation contractors quoting several jobs a week. Energy auditors who need to hand a homeowner a defensible number. Weatherization crews. Remodelers pricing a retrofit. And homeowners working out how many bags an attic takes before driving to the store.
BUILT FOR THE JOB
✓ Dark by default, because attics and crawl spaces are dark
✓ Type what your tape says: 12' 6-1/2" - no decimal conversion in your head
✓ Safety warnings where they matter: IC-rated fixture clearances, flue standoffs, and a hard stop on knob-and-tube wiring and vermiculite
✓ Four reference screens: R-value chart, climate zone table, safety guide, converters
FREE, AD-FREE OR PRO
All 34 calculators are free forever. Ads support the free tier. Remove Ads Forever is a one-time $2.99. Pro Contractor ($14.99, one time, no subscription) adds unlimited saved projects, branded PDF quotes with your logo, CSV price book import and export, saved assembly templates and home-screen widgets.
R-value recommendations and coverage figures are reference defaults. The manufacturer's coverage chart governs quantities - always verify local code.
Smart Insulation Calculator is a 34-calculator estimating toolkit for insulation contractors, energy auditors and weatherization crews - and straightforward enough for a homeowner doing their own attic. No sign-in, no account, and no signal required. It all runs on your phone, which matters when you are standing in a crawl space.
WHY IT IS DIFFERENT
Nobody buys "some insulation". You buy enough to hit a target R-value. So every quantity in this app follows the same visible chain:
Target R-49 → cellulose R-3.5/in → 14.0 inches → 1,000 sq ft → 40 bags
You see the reasoning, not just the answer, so you can show a customer why the number is the number. Switch material and the whole chain re-runs.
THE ENVELOPE
✓ Wall batt calculator - net of windows and doors, batt width from stud spacing
✓ Attic blown-in - bags off the coverage chart at depth, with cellulose settling
✓ Attic batts and rolls - first layer in the bays, second cross-laid over the joists
✓ Cathedral and vaulted ceilings - what R actually fits, minus the vent gap
✓ Floor and crawl space batts - including the support wires that hold them up
✓ Crawl space encapsulation - wall board, ground barrier, seam tape, fasteners
✓ Basement walls - rigid board against concrete plus a framed wall inside it
✓ Rim and band joist - cut board per bay, or spray foam by the board foot
✓ Dense-pack retrofit - pounds and bags by density, plus drill holes per bay
✓ Garage and bonus room - walls, ceiling and door kit as one aggregated job
MATERIALS AND BARRIERS
✓ R-value stack - add layers, get total R and U for the whole assembly
✓ Climate zone lookup - code minimums by IECC zone, assembly and code year
✓ Spray foam - board feet, open cell against closed cell, DIY kits or bulk
✓ Rigid foam board - sheets, seam tape, adhesive, with the polyiso cold derate
✓ Mineral wool, radiant barrier, vapour barrier - including which side it goes on
✓ Attic ventilation - net free area, soffit and ridge split, baffle count
✓ Duct and pipe insulation, plus a soundproofing assembly
PERFORMANCE AND ENERGY
✓ Air sealing kit - caulk, foam, gaskets and covers for the highest-return step
✓ Heat loss and BTU - conductive loss per surface, so you know what to fix first
✓ Savings and payback - before and after R, estimated annual saving, payback
✓ Cost per R - which material is genuinely the cheapest path to your target
✓ Existing R estimator - measure what is there, see the gap to code in one tap
✓ Removal estimating and a 25C-style tax credit checker
COSTS AND QUOTING
✓ Labour by square foot, hour or bag, with an honest attic-access factor
✓ Material cost against your own saved price book
✓ Markup and margin - and the difference between them, which costs people money
✓ Customer quotes, PDF export, shopping lists and quoted-against-actual tracking
WHO IT IS FOR
Insulation contractors quoting several jobs a week. Energy auditors who need to hand a homeowner a defensible number. Weatherization crews. Remodelers pricing a retrofit. And homeowners working out how many bags an attic takes before driving to the store.
BUILT FOR THE JOB
✓ Dark by default, because attics and crawl spaces are dark
✓ Type what your tape says: 12' 6-1/2" - no decimal conversion in your head
✓ Safety warnings where they matter: IC-rated fixture clearances, flue standoffs, and a hard stop on knob-and-tube wiring and vermiculite
✓ Four reference screens: R-value chart, climate zone table, safety guide, converters
FREE, AD-FREE OR PRO
All 34 calculators are free forever. Ads support the free tier. Remove Ads Forever is a one-time $2.99. Pro Contractor ($14.99, one time, no subscription) adds unlimited saved projects, branded PDF quotes with your logo, CSV price book import and export, saved assembly templates and home-screen widgets.
R-value recommendations and coverage figures are reference defaults. The manufacturer's coverage chart governs quantities - always verify local code.
Insulation calculator: R-value, attic blown-in, batts, spray foam. Works offline
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
What’s new
A rebuilt home screen.
Your current job is now the first thing you see - name, calculations and running total, one tap to open it.
Browse by category instead of scrolling 34 tiles: Envelope, Materials & Barriers, Performance, Costs & Business. Each opens a list saying what every calculator does.
The R-value chart, climate zones, safety guide and converters are now on the home screen instead of buried in More.
On tablets the home screen lists every calculator too.
Your current job is now the first thing you see - name, calculations and running total, one tap to open it.
Browse by category instead of scrolling 34 tiles: Envelope, Materials & Barriers, Performance, Costs & Business. Each opens a list saying what every calculator does.
The R-value chart, climate zones, safety guide and converters are now on the home screen instead of buried in More.
On tablets the home screen lists every calculator too.
App support
About the developer
DixonAppStudio LLC
support@dixonappstudio.com
1860 Wildwood Ln
Elgin, SC 29045-8341
United States
+1 803-729-8209
