Is this unit converter free?

Yes. It is free with no sign-up. Ten categories — length, weight, temperature, volume, area, speed, time, data storage, pressure and energy — convert instantly in your browser.

Why is there no currency converter?

Exchange rates change every day, so a money conversion without live rates would be a guess dressed up as an answer. This tool deliberately excludes currency; use your bank or a live-rate service for money.

How accurate are the conversions?

They use established SI and NIST factors — 1 inch is exactly 2.54 cm and 1 pound is exactly 0.45359237 kg — and the formula is shown with every result. Results are rounded to sensible significant figures for everyday use.

Can I use these results for medical, engineering or aviation work?

No. These are everyday conversions for school, cooking, travel and shopping. For medical dosing, engineering sign-off, aviation or anything safety-critical, verify professionally with the proper instruments.

Is anything I type uploaded or stored?

No. Every calculation happens in your browser tab. Nothing is uploaded, stored on a server or shared by this tool.

Convertisseur d'unités — Longueur, poids, température, volume et plus, gratuit

Convertisseur d'unités gratuit. Convertissez longueur, poids, température, volume, surface, vitesse, temps, données, pression et énergie avec facteurs réels, formules affichées et préréglages. Sans monnaie, sans inscription, sans envoi.