HealthCalc

Measurement Conversions

Convert between different units of measurement for weight, height, volume, and more

Conversion Category

Weight / Mass Converter

Quick Reference

1 kg = 2.205 lb = 35.274 oz
1 stone = 14 lb = 6.350 kg

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Frequently Asked Questions About Unit Conversions

Accurate unit conversions are critical for health and fitness tracking because small errors compound over time. For example, confusing pounds with kilograms in weight tracking could lead to misinterpreting weight loss progress. Inaccurate calorie conversions between kcal and kJ could result in under or overeating. When sharing health data with medical professionals, using the correct units ensures proper diagnosis and treatment. Our converter uses precise conversion factors (not rounded approximations) to maintain accuracy.
In nutrition, "calorie" (with lowercase c) typically refers to kilocalorie (kcal), also written as Calorie with uppercase C. 1 kilocalorie = 1,000 small calories (cal). This can be confusing because food labels might say "calories" but actually mean kilocalories. For example, a food labeled "200 calories" contains 200 kcal or 200,000 small calories. In scientific contexts, energy is often measured in kilojoules (kJ), where 1 kcal = 4.184 kJ. Most nutrition databases use kcal.
To convert height from feet and inches to centimeters: 1) Convert feet to inches (multiply feet by 12), 2) Add remaining inches, 3) Multiply total inches by 2.54 to get centimeters. For example, 5 feet 9 inches = (5 × 12) + 9 = 69 inches = 69 × 2.54 = 175.26 cm. Our converter handles this automatically. Note: Many health calculators require height in centimeters (metric) or total inches (imperial), not feet alone.
Use whichever system you're most familiar with, but be consistent. Metric (kg) is used internationally and in scientific contexts, with finer precision for small changes (0.1 kg = 0.22 lb). Imperial (lb) is common in the US and UK. Stones are primarily British. For detailed tracking, kilograms are often preferred because 0.1 kg increments are easier to track than 0.2 lb increments. What matters most is consistency - don't switch systems mid-tracking, as this introduces conversion errors and makes trends harder to spot.
Yes, our conversion factors use standard international definitions with high precision (4+ decimal places). For example: 1 kg = 2.20462 lb (not 2.2), 1 in = 2.54 cm (exact), 1 kcal = 4.184 kJ (thermochemical). These are suitable for health tracking, nutrition planning, and medical contexts. However, for clinical research or pharmaceutical applications requiring extreme precision, consult official NIST or BIPM standards. For everyday health and fitness use, these conversions are more than adequate.
Learn more about Measurement Conversions
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