Pricing
The calculator is free and unlimited. Pro plans add saved projects, room-by-room, and branded reports — 14-day trial, no card to start.
FreeAvailable now
$0forever
The full calculator. No account, no limit.
- ✓Whole-house Manual J load
- ✓Equipment sizing + Manual S
- ✓On-screen breakdown of every BTU
- ✓Printable report
Pro Solo14-day trial
$49/ month
For the independent contractor.
- ✓Saved projects + history
- ✓Room-by-room loads
- ✓Branded permit + homeowner PDF
- ✓Unlimited calculations
Pro Team14-day trial
$179/ month
For the shop. Up to 5 seats.
- ✓Everything in Pro Solo
- ✓Up to 5 seats
- ✓White-label reports
- ✓Priority support
FounderLifetime · 100 seats
$699once
Lifetime. Limited to 100.
- ✓Everything in Pro Team
- ✓Lifetime access
- ✓Founder roadmap input
- ✓Locked-in price
Payments via Paddle (Merchant of Record). 14-day trial on Pro, no card to start, 14-day refund window. A one-off single report is available for $19.