Free
Calculators
Free
- All twenty-nine planning calculators
- Formula, sources and assumptions shown
- Works offline as an installable app
- No account needed
- No saved estimates, PDF reports or CSV exports
LoadCairn / Plans
Plans for critical facility planning
Use every calculator for free, or save estimates and share projects with Pro and Team.
Choose monthly or yearly billing for Pro.
Free
Calculators
Free
- All twenty-nine planning calculators
- Formula, sources and assumptions shown
- Works offline as an installable app
- No account needed
- No saved estimates, PDF reports or CSV exports
Pro
14-day trial
Saved estimates & reports
$29/month
- Save and reopen calculator estimates
- Download report PDFs
- Export saved estimates as CSV
14-day trial. A card may be required at checkout; billing starts after the trial ends.
SubscribeTeam
Shared workspace for Pro subscribers
$99/month
Monthly add-on to Pro · up to 10 seats
- Shared Team workspace
- Up to 10 seats
- Invite teammates by email
- Share saved calculator projects with workspace members
Compare plans
| Features | Free | Pro | Team |
|---|---|---|---|
| All twenty-nine calculators, formula & trace shown | Included | Included | Included |
| Works offline (installable app) | Included | Included | Included |
| Account needed | No | Yes | Yes |
| Save and reopen estimates | Not included | Included | Included |
| Download report PDFs | Not included | Included | Included |
| Export saved estimates as CSV | Not included | Included | Included |
| Shared Team workspace | Not included | Not included | Included |
| Invite teammates by email | Not included | Not included | Included |
| Seats | 1 | 1 | Up to 10 |
| Monthly price | Free | $29/month or $290/year | $99/month add-on to Pro |
Team is available as a monthly add-on for Pro subscribers.
Pro starts with a 14-day trial. Checkout may request a card; subscription billing starts after the trial.