Unit	Value
Kilograms	70.0
Pounds	154.3
Stones	11.02
Grams	70000

Unit

Value

Kilograms

70.0

Pounds

154.3

Stones

11.02

Grams

70000

Understanding Weight and Mass Measurements

Weight and mass are often used interchangeably in everyday life, but scientifically, mass is the amount of matter in an object (constant), while weight is the force of gravity on that mass (varies by location). For practical health and fitness purposes, we use standard Earth gravity.

How to Use This Converter

Enter your value in the input field.
Select the unit of your input value (kg, lb, st, or g).
Choose your desired output unit using the radio buttons.
Click "Convert" to see the precise conversion in the result panel.
The "All Unit Conversions" table updates automatically for quick reference.

Real‑Life Examples

Fitness Tracking: A person weighs 185 lb. In kilograms, that's 83.9 kg (185 ÷ 2.20462).
Cooking/Baking: A recipe calls for 500 g of flour. That's 1.102 lb or about 17.64 oz.
Travel: Airline luggage allowance is 23 kg. That equals 50.7 lb—useful to check before airport weigh‑in.
Baby Weight: A newborn weighs 3.2 kg. In pounds, that's 7.05 lb; in pounds+ounces, that's 7 lb 0.8 oz.

Common Weight‑Mass Reference Table

Kilograms (kg)	Pounds (lb)	Stones (st)	Common Context
50	110.2	7.87	Light adult
70	154.3	11.02	Average adult
90	198.4	14.17	Heavy adult
0.5	1.102	0.0787	Medium loaf of bread

Common Measurement Pitfalls

Scale Calibration: Home scales can drift; check with a known weight periodically.
Time of Day: Weight fluctuates daily (food, hydration, waste). For tracking, weigh at the same time (e.g., morning).
Unit Confusion: "Stone" (st) is 14 lb, used mainly in the UK/Ireland. It is not a metric unit.
Medical vs. Common Use: In medical contexts, kg are standard. In the US, pounds are common. Always confirm the unit with your clinician.

Weight‑Change Visualizer

See how a change in weight translates across units. Adjust the slider to add or subtract weight from the current conversion.

Adjustment: 0 kg

-20 kg 0 kg +20 kg

Scenario	Kilograms	Pounds	Change in Pounds
Current	70.0	154.3	—
With adjustment	70.0	154.3	+0.0

Frequently Asked Questions

How accurate is this converter?

The conversion factors are exact mathematical constants (e.g., 1 kg = 2.20462262185 lb). Results are rounded to the selected decimal places. Accuracy is limited only by numerical precision in JavaScript (about 15–17 significant digits).

Why does my scale show a slightly different conversion?

Some scales use a simplified conversion (e.g., 1 kg = 2.2 lb exactly). Also, scale calibration, battery level, and weighing surface can affect readings. For medical purposes, use a calibrated scale and report measurements in the unit your clinician prefers.

When should I be concerned about weight changes?

Sudden, unintentional weight loss or gain (e.g., >5% of body weight in a month) can be a sign of underlying health issues. Consistent trends over weeks are more meaningful than daily fluctuations. Discuss persistent unexplained changes with a healthcare provider.

What's the best way to measure weight at home?

Use a hard, flat surface (not carpet). Weigh at the same time of day (morning after bathroom, before eating/drinking), in similar clothing. Record the average of 2–3 readings taken moments apart. Use the same scale for tracking trends.

Can I convert pounds to kilograms for medication dosing?

Absolutely not. Medication dosing requires precise, verified calculations by a pharmacist or clinician. This tool is for informational purposes only. Never self‑calculate medication doses based on weight conversion.

Formulas & Assumptions

1 kilogram (kg) = 2.20462262185 pounds (lb)

1 pound (lb) = 0.45359237 kilograms (kg)

1 stone (st) = 14 pounds = 6.35029318 kilograms

1 gram (g) = 0.001 kilograms; 1 kilogram = 1000 grams

Rounding: Results are rounded to 4 decimal places for display; internal calculations use full precision.

Assumption: Conversions use standard Earth gravity (9.80665 m/s²). For mass‑to‑weight on other celestial bodies, additional factors apply.

Weight and Mass Converter

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