Weight Converter
Convert between 10 weight units — milligram, gram, kilogram, metric ton, ounce, pound, stone, US ton, UK ton, carat. All conversions visible at once.
What powers the Weight Converter
10 units: mg, g, kg, t, oz, lb, st, US ton, UK ton, carat
Exact conversion factors per BIPM (1 lb = 0.45359237 kg)
US ton ≠ UK ton (10% difference) — both included
Stone = 14 lb (UK body weight unit)
Carat for jewelry (0.2 g)
All conversions shown simultaneously
Why the Weight Converter is different
Browser-native
The Weight Converter runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Fitness — converting body weight between metric and imperial
- Cooking — recipe weight conversions
- Shipping — pound to kilogram for international freight
- Jewelry — gram to carat for gem weight
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.