Our Methodology

Super Calculator is a set of tools, not opinion articles. Our job is simple: every calculator should return the right number, use a transparent formula, and cite the standard or source it is based on. This page explains exactly how we do that so you can trust — and check — our results.

1. We use authoritative formulas

Each calculator implements the recognized formula or published standard for its topic, not a homemade approximation. A few examples of the sources we build on:

• Health & fitness — Mifflin–St Jeor and Harris–Benedict equations (BMR/calories), the U.S. Navy body-fat method, WHO BMI classification, the Institute of Medicine (IOM) pregnancy weight-gain guidelines, the Widmark formula (BAC), and the Karvonen heart-rate-reserve method.
• Finance — the standard amortization formula used by lenders (loans and mortgages), time-value-of-money formulas (present/future value, compound interest), the 2025 IRS tax brackets and the Social Security bend-point formula, and FHA MIP rates.
• Science & weather — the official U.S. National Weather Service wind-chill and heat-index formulas, the NOAA solar-position algorithm (sunrise/sunset), and standard physics and chemistry relationships (density, molarity, Ohm's law).
• Math — exact mathematical definitions (determinants by cofactor expansion, Gauss–Jordan matrix inversion, permutation and combination formulas, and geometry surface-area and volume formulas).

2. Every formula is tested before it ships

Before a calculator goes live, its formula is executed against known correct values — worked textbook examples, published reference figures, or hand calculations. A calculator is only published once its output matches those checks exactly. For example, our matrix calculator is validated by confirming that A × A⁻¹ returns the identity matrix, and our loan tools are checked against standard amortization tables.

3. The math is transparent

You never have to take the result on faith. Every calculator shows a step-by-step breakdown of how it reached its answer, and most include the underlying formula on the page. If you can follow the breakdown, you can verify the result yourself.

4. Private by design

Calculations run entirely in your browser. Nothing you type is sent to a server, stored, or tracked. The tools work offline once the page has loaded.

5. Estimates, not professional advice

Many of our calculators cover money, health, and other consequential topics. They are built to be accurate, but they produce estimates based on the information you enter and standard assumptions — they cannot know your full situation.

• Financial & tax tools give planning estimates. Your actual rates, payments, and tax outcomes depend on your lender, credit, and current law — confirm major decisions with a licensed professional.
• Health & fitness tools use population-based formulas and do not account for individual medical conditions. Consult a qualified healthcare provider for personal advice.
• Official figures (for example, Social Security benefits or taxes owed) should be confirmed with the relevant authority, such as ssa.gov or irs.gov.

See our Terms of Use for the full disclaimer.

6. Updates & corrections

Rates, tax figures, and guidelines change, and we update calculators when they do. If you ever spot a result that looks wrong, please tell us — we take accuracy seriously and will investigate and correct it promptly.