Calculators for your business

A good calculator turns visitors into customers: a salary after tax for a recruiter, a price with VAT for a shop, a savings plan for a bank. We build them for you and host them, so you paste one snippet into your site and nothing else.

What you get

• Your rules, your look. Your formulas, rates and wording, in your colours, font and logo, in English, German or both.
• Checked against the source. Every calculator comes with a verification report: the official sources, test cases and a cross-check. You sign off before it goes live.
• Hosted for you. One snippet to paste, whether your site is plain HTML, WordPress, Webflow, Wix or Squarespace. No ads inside it.
• Kept up to date. When rates change, we update the calculator and tell you.

What is on the way

• Free embeds. Any calculator on this site will be embeddable with a link back to AbacusKit.
• An API with the same calculators, for apps and spreadsheets. Not available yet, see the API page.

How it works

1. You write to us with what the calculator should do and who uses it.
2. We reply with a short plan: inputs, results, sources and what we need from you.
3. We build it, you check the verification report, and it goes live on your site.

Write to support@rondigi.com with “Calculator” in the subject. We answer on working days.