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Spotted a formula that looks wrong, have an idea for a calculator, or just want to say hello? We read every message.
The quickest way to reach us is by email at hello@healthycalculatorhub.com.
Before you write
If you're reporting a calculation issue, please tell us which calculator, the numbers you entered, and the result you expected — it helps us reproduce and fix things quickly. For general health questions, remember that our tools provide estimates for education only and can't replace advice from a qualified professional.