Pricing

All calculations are free to use without an account. 17 basic calculators hand out their verification PDF without any purchase; for the rest, Pro unlocks a comprehensive verification PDF, or Premium the scope of a specialist software package, such as exporting geometry data for CAD import.

Your price stays: if you subscribe today, you keep paying the amount you started with, even after a later price change. Changes only apply to new subscriptions.

How long a one-off purchase carries: for a calculator bought outright we guarantee at least 36 months of operation from the date of purchase, including the updates required to keep it contractually sound. After that it keeps running for as long as we operate the website. Should we discontinue operation, we announce it twelve months in advance; if the guaranteed operating period is still running at that point, we refund the share of the purchase price attributable to the remaining time. The reports and export files you created stay with you without any time limit. Details and limits are set out in the terms of use.

Your contracting party for the purchase is Paddle.com Market Limited, London, acting as merchant of record. Invoicing, withdrawal and refunds are handled by Paddle. The terms of use apply.

All prices include VAT. For purchases outside Germany the final price follows the VAT rate applicable there; it is shown during checkout.