Built for everyone who needs fast, accurate answers.
ILoveCal started with a simple idea: great calculators should be free, fast, and free of clutter. No sign-up. No ads blocking your results. Just the number you need.
Our Principles
Every decision we make comes back to these four commitments.
Accuracy First
Every formula is based on industry-standard mathematics. We test every calculator against known values before publishing.
Speed Matters
All calculations run entirely in your browser. No server round-trips, no waiting — results appear the moment you type.
Privacy by Default
We do not store your inputs. Nothing you type into any calculator is sent to our servers or third parties.
Always Free
Every single tool on ILoveCal is free, with no premium tier or paywall. We believe good tools should be accessible to all.
The ILoveCal Editorial Team
Every calculator on ILoveCal is built, written and maintained by the ILoveCal Editorial Team. We are a small independent team of developers and writers who care about getting the numbers right.
We don't ask you to take our word for it. Instead of hiding the math behind a single answer, every page shows:
- The exact formula used, with the working for your own inputs.
- Primary sources: IRS publications for tax, the CFPB for loans and APR, the CDC, WHO and peer-reviewed papers for health, NIST for math and statistics.
- A "last reviewed" date, so you know how current the figures are.
- Plain-language limits: what the result can and cannot tell you.
You can check any result by hand, or against the source it cites.
How we build & check every calculator
Calculators about money and health can affect real decisions, so each one goes through the same process before it is published and again whenever the underlying rules change.
Formulas and figures come from the organization that defines them: the IRS for tax brackets, Regulation Z for APR, the CKD-EPI 2021 paper for eGFR, Mifflin–St Jeor for BMR. They never come from another calculator site.
The formula is shown on the page and the working is printed for your inputs, so every step is visible and checkable.
Results are checked against published worked examples and known reference values, including edge cases such as zero interest, very large numbers and invalid inputs.
Tax calculators are updated when the IRS publishes each year's inflation adjustments. Health calculators are re-checked when clinical guidelines change. Each page shows its last-reviewed date.
If you find an error, tell us. We verify every report, fix confirmed mistakes promptly, and update the review date.
Financial calculators
Our finance and tax tools give estimates for education and planning. They are not financial, tax or legal advice. Rates, fees and tax rules vary, so confirm important numbers with your lender, the IRS or a qualified professional.
Health & fitness calculators
Our health tools use validated population formulas, but they cannot replace a clinician. They are not medical advice. Please talk to a doctor or registered dietitian before acting on a result, especially during pregnancy or if you have a medical condition.
Read our full disclaimer, privacy policy and terms.
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