About CalcHub
Free calculators for the numbers behind everyday decisions.
What is CalcHub?
CalcHub is a collection of free online calculators covering personal finance, health, and everyday math — from compound interest and mortgage payments to BMI, sleep cycles, and tip splitting. Each tool answers one question well: type your numbers, get the answer instantly.
Private by design
Every calculation happens locally in your browser with plain JavaScript. Your numbers are never uploaded, stored, or shared. There are no accounts, no tracking pixels, and no analytics watching what you compute. Read our privacy policy for the full details.
Built for accuracy
Each calculator shows the formula it uses in its "How it works" section, so you can verify the math yourself. Results are estimates based on the numbers you enter — they are a starting point for decisions, not professional financial, tax, or medical advice.
Get in touch
Found a bug, want a new calculator, or have feedback? Contact us — we read every message.