How do I convert kg to lbs?

To convert kilograms to pounds, multiply by 2.20462. For example, 70 kg × 2.20462 = 154.3 lbs. To convert lbs to kg, divide by 2.20462 (or multiply by 0.453592). This converter handles the calculation automatically in real time.

How do I convert cm to inches?

To convert centimetres to inches, divide by 2.54 (exact). For example, 175 cm ÷ 2.54 = 68.9 inches (5 ft 8.9 in). To convert inches to cm, multiply by 2.54. This converter updates both fields simultaneously as you type.

How do I convert mmHg to kPa?

To convert mmHg (millimetres of mercury) to kilopascals, multiply by 0.133322. For example, 120 mmHg × 0.133322 = 16.0 kPa. Blood pressure is often expressed in mmHg in clinical practice but kPa in some European and international contexts.

Universal Unit Converter – Weight, Height, Volume, Pressure & More

About This Unit Converter

This converter uses exact NIST-defined conversion factors for physical units, ensuring accuracy to full floating-point precision. All calculations happen instantly in your browser — no server requests, no latency, and no data transmitted.

Why Accuracy Matters in Clinical Conversions

In clinical practice, unit conversion errors have caused serious medication incidents — notably when weight in lbs was misread as kg (a 2.2× error) or when blood pressure was confused between mmHg and kPa. Our converter explicitly labels all units and uses exact conversion factors, not rounded approximations.

Categories Covered

Weight: kg, g, lbs, stone, oz, mg, mcg — for body weight and drug dosing
Height: cm, m, inches, feet+inches — for clinical measurements
Volume: mL, L, fl oz, tsp, tbsp, cups, pints — for fluid and medication volumes
Pressure: mmHg, kPa, cmH₂O, atm, bar, psi — for blood pressure and ventilator settings
Temperature: °C, °F, K — with clinical reference bands
Speed: km/h, mph, m/s, knots
Area: cm², m², in², ft²
Length: mm, cm, m, km, in, ft, yd, miles

Frequently Asked Questions

How do I convert stone to kg?+

One stone = 6.35029 kg (exactly). So 11 stone = 11 × 6.35029 = 69.85 kg. Many UK patients report weight in stone — use this converter to quickly translate to kg for clinical calculations. Select Weight category, set "From" to Stone and "To" to kg.

What is the difference between mmHg and kPa for blood pressure?+

Both measure pressure. 1 mmHg = 0.133322 kPa. Blood pressure of 120/80 mmHg = 16.0/10.7 kPa. The UK and some European countries commonly report blood pressure in mmHg, but kPa is used in some academic and research contexts, and is the SI unit of pressure. Ventilator pressures are often expressed in cmH₂O (1 cmH₂O = 0.0980665 kPa).

How many mL are in a teaspoon?+

One US teaspoon = 4.92892 mL (often rounded to 5 mL in medication instructions). One UK teaspoon = 5.91939 mL. Most clinical medication instructions use 5 mL as the standard teaspoon. When dispensing liquid medications, always use a calibrated measuring spoon or syringe rather than a household teaspoon, which varies significantly in volume.

Related Converters

For medication dose unit conversion (mcg to mg, mg/kg to total dose), see Medication Dose Converter. For laboratory value conversion (mg/dL to mmol/L), see Lab Values Converter. For temperature specifically with clinical fever thresholds, see Temperature Converter.

⚠️ Note: Always verify critical clinical conversions — particularly drug doses and body weight — with a second source before acting on them in patient care.