Standard
$99
per year
1,000 requests / day
Resets at midnight UTC
Resets at midnight UTC
| Endpoints | All 5 |
| Response time | < 100ms |
| Support | |
| Uptime SLA | 99.9% |
| API key | Included |
| Units accepted | mm, cm, m, in, ft |
Most Popular
Enterprise
$299
per year
10,000 requests / day
Resets at midnight UTC
Resets at midnight UTC
| Endpoints | All 5 |
| Response time | < 100ms |
| Support | Priority email |
| Uptime SLA | 99.9% + response time SLA |
| API key | Included |
| Units accepted | mm, cm, m, in, ft |
Full Plan Comparison
| Feature | Standard | Enterprise |
|---|---|---|
| Price | $99 / year | $299 / year |
| Daily requests | 1,000 / day | 10,000 / day |
| Endpoints | All 5 | All 5 |
| Response time | < 100ms | < 100ms |
| Support | Priority email | |
| Uptime SLA | 99.9% | 99.9% |
| Response time SLA | — | Included |
| Unit formats | mm, cm, m, in, ft | mm, cm, m, in, ft |
| Multi-item batching | Yes (array) | Yes (array) |
| Usage dashboard | Yes | Yes |
The Math Is Simple
At a $150/hr developer rate, the Standard plan at $99/yr equals 40 minutes of developer time.
Building a CBM calculator from scratch — with accurate unit conversion, multi-item aggregation, volumetric weight for both air and sea, and container fit logic — takes 3–5 developer days minimum. That's $3,600–$6,000 in initial development, plus ongoing maintenance when edge cases surface.
The API pays for itself in the first hour you don't spend on it. Every year after that, you save the same 3–5 days in maintenance, testing, and compatibility updates.
Frequently Asked Questions
No. The API is sold on a yearly subscription basis only — $99/yr for Standard and $299/yr for Enterprise. Yearly billing keeps the price low and funds reliable infrastructure. There is no monthly option.
One HTTP request to any endpoint counts as one API call, regardless of how many items are in the payload. A single
/calculate call with 50 items in the array is still one request — not 50. This makes the daily limits very practical for real-world workloads.Yes. You pay the prorated difference for the remaining months in your subscription year. Your daily request limits upgrade immediately upon payment. Contact support to initiate a mid-year upgrade.
No free tier. All plans are paid yearly subscriptions. All calculators are freely available on calculatecbm.com for manual use at no cost. Full API documentation is also public — you can review the complete response schema before purchasing.
Credit and debit cards — Visa, Mastercard, and Amex. Additional payment methods are coming soon. For enterprise invoicing or purchase-order-based payment, contact us directly.
Ready to integrate?
Read the docs, then sign up. Your API key arrives in under 5 minutes.