Contact us
Have a question about one of our calculators? Found an error in the tax data? Want to suggest a new feature? We'd love to hear from you.
We usually respond within 24–48 hours.
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Common questions
Is Calcinum free?
Yes — all 25 calculators and 51 state paycheck calculators are completely free, with no signup required.
How accurate are your calculators?
We use official 2026 tax data (updated for the OBBB Act) and verify state rates against official sources. See our About page for details on our accuracy process.
Can I suggest a new calculator?
Yes! Use the form above with "Feature request" as the subject. We prioritize suggestions based on user demand and search volume.
I found an error in the calculations
Please report it using the form above with "Calculator bug" or "Tax data error" as the subject. Include the calculator name, the inputs you used, and what seems incorrect. We take accuracy seriously and will investigate promptly.