LAST UPDATED 19 OCTOBER 2026

Legal notice & privacy

Operator & contact

This project is operated by Jonas Volk in a personal capacity.

Jonas Volk
Nebelbachstrasse 3
8008 Zürich
Switzerland

Your calculations

The public calculator processes inputs in the browser. Its application code does not send those inputs to a server, store them in browser storage or load third-party analytics, advertisements or remote fonts. A downloaded calculation is saved to the location you choose.

Hosting

The website is hosted using Cloudflare Pages. The hosting service may process request information such as IP address and browser information to deliver and secure the page. Its handling of information is described in Cloudflare's privacy policy. We do not claim that the hosting infrastructure keeps no logs.

Feedback & contact

Tell us what you make, which costing step is difficult, or what you would need from the offline toolkit. Use made-up figures if you prefer.

Email workshop feedback · Email candle-costing feedback

These feedback links open your own email application with prompts you can edit. Sending an email shares your email address and message with the operator and the email service providers involved. We use that information to answer the enquiry and improve the product. It is not a newsletter signup. Do not send sensitive business records, payment information or customer data.

Relevant enquiries are retained only as needed to handle the conversation; nonessential contact details are removed from research notes. You may contact the operator to request access, correction or deletion of the information you sent, subject to any applicable retention duties.

Current availability

The calculator is free. The offline toolkit is in preparation and is not offered for purchase on this page. No payments, accounts or mailing-list subscriptions are collected here.

Calculation scope

This tool provides estimates from your own inputs, not tax or accounting advice. It does not validate current marketplace fees or guarantee profitability. Check your inputs, fee assumptions and result before making pricing decisions.