About SimplyCalc
Last updated: April 2025
SimplyCalc was built out of a straightforward frustration: most online calculators are either buried inside financial product pages trying to sell you something, surrounded by intrusive advertising, or simply inaccurate. We wanted something different — a clean, honest tool that gives you real answers with no agenda.
We are a small independent team based in Europe. Our goal is simple: build the best free calculators on the internet and keep them that way. No subscriptions, no paywalls, no upsells to financial products. SimplyCalc is funded entirely by non-intrusive advertising through Google AdSense.
Our commitment to accuracy
Every formula on this site is based on published standards: the Mifflin-St Jeor equation for calorie estimation, standard amortization for mortgage and loan calculations, WHO BMI classifications, and conventional date arithmetic. We review our calculators regularly and are transparent about the limitations of each tool, because context matters as much as the number.
What we cover
- Finance: Mortgage payments, savings goals, loan repayments, and tip splitting
- Health: BMI with healthy weight ranges, daily calorie needs (TDEE)
- Time: Exact age calculations, days between dates, event countdowns
A note on professional advice
Our calculators are educational tools. They are not a substitute for professional financial, medical, or legal advice. A mortgage calculator can tell you your estimated monthly payment; only a licensed mortgage advisor can tell you what you will actually qualify for. A BMI calculator can give you a screening number; only a doctor can assess your actual health. We always recommend consulting qualified professionals for decisions that carry real consequences.
If you have feedback, spotted an error, or have a suggestion for a new calculator, we would love to hear from you. Please use the contact form.
Our Editorial Standards
Every calculator on SimplyCalc is built from published, peer-reviewed or government-issued formulas. We link our methodology to primary sources wherever possible.
- Mortgage & loan calculators use standard amortisation mathematics, the same formula used by UK lenders under FCA guidelines and US lenders under CFPB rules.
- BMI uses the WHO classification system (World Health Organisation, Technical Report Series 854).
- Calorie/TDEE estimates use the Mifflin-St Jeor equation (1990), the formula recommended by the Academy of Nutrition and Dietetics.
- Body fat % uses the US Navy circumference method, published by Hodgdon & Beckett (1984).
- UK salary figures use current HMRC rates updated each April. US estimates use IRS federal brackets.
- VAT rates are sourced from European Commission data and HMRC public guidance.
We review all calculators when rates or formulas change, and note the last-reviewed date on each page.
Who We Are
SimplyCalc is run by a small independent team of developers, writers, and former financial professionals based in Europe. Our contributors include:
- Finance writers with backgrounds in UK and European personal finance journalism
- Former mortgage brokers and IFAs who review calculator logic and outputs
- Software developers who build and maintain the calculator engines
We do not accept paid placements, sponsored calculator results, or affiliate fees from financial product providers. Our only revenue is Google AdSense display advertising.
Corrections & Updates
Found an error? We take accuracy seriously. If you spot a mistake in any calculator output or editorial content, please use our contact page and we will investigate and correct it within 48 hours. We publish correction notices where significant errors are corrected.
Limitations & Disclaimer
SimplyCalc calculators are designed for educational and planning purposes only. They provide estimates based on the inputs you enter and standard formulas — they are not a substitute for professional financial, medical, or legal advice.
Tax rates, benefit entitlements, and financial regulations change. Always verify figures with a qualified professional before making significant financial decisions. We accept no liability for decisions made on the basis of our calculator outputs.