Mass Converter - Free Online Weight Conversion Tool

How to Use the Mass Converter

1. Enter value — type the number you want to convert (e.g., 5, 0.5, 1000)
2. Select from unit — choose the source unit from the dropdown
3. Select to unit — choose the target unit you want to convert to
4. Get result — the converted value appears instantly with no button click needed
5. Swap units — click the swap button to reverse the conversion direction

Perfect for cooking, fitness, shipping, and science applications.

Features

• 10+ units — milligrams (mg), grams (g), kilograms (kg), metric tons (t), pounds (lb), ounces (oz), stones (st), and more
• Real-time — updates as you type or change units
• Two-way conversion — swap units for reverse conversion with one click
• High precision — results shown to 6 decimal places where applicable
• No data sent — everything runs locally in your browser
• Clean interface — no clutter, just the conversion you need

Use Cases

Cooking and baking frequently require converting between metric and imperial units. A European recipe calling for 500 g of flour converts to about 1.1 lb for American bakers. This converter handles those conversions instantly.

Fitness and health tracking often involves body weight measurements. If your scale shows kilograms but you track progress in pounds, or vice versa, the mass converter gives you an accurate reading every time.

Shipping and logistics professionals calculate package weights in different units depending on the carrier. International shipments may require kilograms while domestic rates quote in pounds. This tool eliminates manual math errors.

Science and education students regularly convert between metric units — grams to milligrams, kilograms to metric tons — for lab work, homework, and experiments.

FAQ

What units does this converter support?

It supports milligrams (mg), grams (g), kilograms (kg), metric tons (t), pounds (lb), ounces (oz), stones (st), and US tons. Most everyday weight conversions are covered.

Is the conversion accurate?

Yes. The tool uses standard conversion factors (e.g., 1 kg = 2.20462 lb). Results are calculated with high precision and rounded to a clean decimal format for readability.

Can I convert ounces to grams?

Yes. Select ounces as the source unit and grams as the target. For reference, 1 ounce equals approximately 28.35 grams.

Does it work offline?

Once the page loads, all conversion logic runs in your browser. You can use it without an internet connection.

What is the difference between mass and weight?

Mass measures the amount of matter in an object (kg, g, lb-mass). Weight measures the force of gravity on that mass. On Earth, the terms are used interchangeably in everyday contexts. This converter handles mass units.