What CalcMentor does
CalcMentor is a growing calculator library for everyday math, finance, health, dates, units, education, travel and planning. The goal is simple: show the answer quickly, then explain how the answer was calculated and what can change it.
Who is responsible for the site
CalcMentor is owned and operated by Vikhagen Online Services, a Norwegian business operated by Hans-Petter Vikhagen. Organization number: 927609894. Business address: Skarabakken 10, 6456 Skala, Norway.
Why the pages include assumptions
Many calculators look precise even when the real-world question is uncertain. A loan payment can change with fees. A calorie estimate can differ from a person's actual energy needs. A currency result can change with the rate source and timestamp. CalcMentor labels those assumptions so you can see what the result does and does not cover.
How calculators are prepared
Before a calculator is recommended on CalcMentor, we check the formula or method, review sources when the topic needs them, test common edge cases and make sure the result explanation works on both mobile and desktop.
Editorial responsibility
Vikhagen Online Services is responsible for publishing, reviewing and correcting CalcMentor content. Our methodology, source and correction policies explain how we keep calculator pages consistent and easier to check over time.
How to read a result
Start with the main result, then check the formula, assumptions and limitations on the same page. If the calculator depends on local rules, live rates or changing public data, look for the entered value, source note or freshness label before relying on the number.
What CalcMentor does not do
CalcMentor does not provide medical, legal, tax, investment or professional advice. Health, finance, retirement, pregnancy and tax-related tools are educational estimates. They can help users understand a topic, but they should not replace qualified professional guidance where the decision matters.
Last reviewed: 2026-05-17