Sub Box Calculator › Pricing
Pricing
The calculator is free and stays free: sealed and ported boxes, graphs, plans, cut list, PDF and DXF. Paid plans add advanced box types and tools for car-audio shops.
Free
$0
no signup
- Sealed and ported boxes with all checks
- Response, excursion and port air speed graphs
- Thousands of subwoofers with manufacturer box specs
- Plans, cut list, sheet layout, PDF report and DXF
- Compare up to 3 variants
- Tone generator, port calculator, guides
Builder
$19.99 once
includes a year of new features, extend for $12.99/year
$3.99 /month
cancel any time
Sales open soon. Everything is free to use for now.
- Passive-radiator, bandpass (4th and 6th order) and T-line boxes
- Driver and port on different walls
- Compare up to 8 variants
- PDF report without the “Made with” line
- Port parts for 3D printing (STL)
Shop
$15.99 /month
14 days free, then $15.99/month
$144.99 /year
$12.08/month, save 24%
Sales open soon. Everything is free to use for now.
- Everything in Builder
- Your logo, contacts and customer name in the PDF
- Customer quote: materials from the cut list plus labor
- Batch nesting of several projects on shared sheets
- CNC DXF with tabs, dogbones and cut order
- Cloud project library on 3 devices
Payments are handled by Paddle.com, our Merchant of Record: it processes the order, adds sales tax or VAT where required and handles refunds. Prices are in US dollars. Terms of Use · Refund Policy (14-day money-back guarantee)
Questions
Is the calculator really free?
Yes. Everything you need to design and build a sealed or ported box is free, with no signup and no time limit.
What does a one-time Builder purchase include?
Every feature available on the purchase day, forever, plus new features released during the following 12 months. You can extend new features for another year at any time.
Can I cancel a subscription?
Yes, at any time in the customer portal. You keep access until the end of the paid period.
How many devices can I use?
A license key works on up to 3 devices.