Convert Kilograms (kg) to Tonnes (t)
1 kilogram equals 0.001 tonnes.
Formula:
t = kg × 0.001
Kilogram to Tonne Converter
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Result
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How to Convert Kilogram to Tonne
1 kilogram = 0.001 tonnes exact
Tonne = Kilogram × 0.001
Example: 1 kg × 0.001 = 0.001 t
Reverse Conversion
To convert tonnes back to kilograms:
- Remember, 1 tonne equals 1000 kilograms.
- To convert 0.001 t to kg, multiply
0.001 x 1000, resulting in1 kg.
exact This conversion factor is exact by international definition.
Common Kilogram to Tonne Conversions
| Kilogram | Tonne | Actions |
|---|---|---|
| 100 kilograms | 0.1 tonnes | |
| 500 kilograms | 12 tonnes | |
| 1000 kilograms | 1 tonne | |
| 2000 kilograms | 2 tonnes |
| Kilogram | Tonne | Actions |
|---|---|---|
| 5000 kilograms | 5 tonnes | |
| 10000 kilograms | 10 tonnes | |
| 50000 kilograms | 50 tonnes |
Kilograms to tonnes Conversion Table
Reference table with common kilograms to tonnes conversions. All values calculated with high precision.
Kilograms to Tonnes Table
1000 to 1 × 108
Tonnes to Kilograms Table
1 to 100000
Definition of Kilogram
- Definition
- The kilogram (kg) is the SI base unit of mass. Since 2019, it is defined by fixing the numerical value of the Planck constant, ensuring stability independent of physical artifacts.
The kilogram is universally used in science, engineering, medicine, commerce, and daily life, forming the reference point for all metric and many non-metric mass units. - Exact factor
- Base unit: 1 kg = 1000 g = 2.2046226218 lb
- Examples
- • 70 kg ≈ 154.32 lb
• 80 kg ≈ 12 st 8.37 lb
Definition of Tonne
- Definition
- The tonne (t), also called the metric ton, is a metric unit of mass equal to one thousand kilograms. It is commonly used in industry, shipping, and science.
The tonne provides a convenient scale for large masses while remaining compatible with the SI system. - Exact factor
- 1 t = 1000 kg = 2204.6226218 lb
- Examples
- • 1.5 t = 1500 kg
• 2 t ≈ 4409.25 lb
About the Kilogram
Facts & Uses
- SI base unit of mass — the only base unit redefined in 2019 (26th CGPM) by fixing the Planck constant at exactly 6.62607015 × 10⁻³⁴ J·s, replacing the 130-year-old physical artifact.
- Universal reference for science, medicine (drug dosage, body weight), commerce (food, freight), and engineering (mechanical loads, structural design).
- Used in nutrition labels, fitness (BMI, weight loss), and international shipping where customs declarations require metric mass.
- Subdivisions: gram (cooking, lab), milligram (pharmacy, dosing), microgram (toxicology); multiples: tonne (industry, freight).
Curiosities
- Until 20 May 2019, the kilogram was defined as the mass of the International Prototype Kilogram (IPK), a platinum-iridium cylinder kept in a vault near Paris since 1889.
- Comparisons with sister copies showed the IPK was drifting by ~50 µg per century — enough to motivate the redefinition via a fundamental constant.
- The kilogram is the only SI base unit whose name still contains a metric prefix ("kilo"), a historical quirk inherited from the 1795 French metric system.
- Approximate equivalents: 1 kg ≈ 2.2046 lb ≈ 35.274 oz ≈ 0.157 stone.
Sources
About the Tonne
Facts & Uses
- Also called the metric ton, equal to exactly 1000 kilograms. Recognized as a non-SI unit accepted for use with the SI by the BIPM.
- Standard for industrial production (steel, cement, grain harvests), international shipping (cargo manifests, container weights), and environmental reporting (CO₂ emissions in tonnes).
- Used in vehicle weight ratings (a small car ≈ 1–1.5 t; a fully loaded semi-truck ≈ 40 t in the EU), mining, and agriculture.
- Distinct from the US short ton (2000 lb ≈ 907 kg) and the UK long ton (2240 lb ≈ 1016 kg) — confusion between the three is a common source of trade disputes.
Curiosities
- The international symbol is "t" (lowercase) — the uppercase T is reserved for the tesla (magnetic flux density), an entirely unrelated SI unit.
- Global annual CO₂ emissions are measured in billions of tonnes (Gt); a single transatlantic flight emits about 1 t of CO₂ per passenger.
- The blue whale, the largest animal ever known, weighs up to 180 tonnes — equivalent to about 30 African elephants.
- 1 t = exactly 1000 kg = 2204.62 lb ≈ 1.102 short tons ≈ 0.984 long tons.
Sources
Frequently Asked Questions
How many tonnes are in one kilogram?
One kilogram equals 0.001 tonnes. To convert, multiply the kilogram value by 0.001. For the reverse, divide the tonne value by 0.001 (or multiply by 1000).
What is 0.03 kilograms in tonnes?
0.03 kilograms = 3 × 10-5 tonnes. This is one of the most commonly searched conversions for this pair.
Is the kilogram-to-tonne conversion exact?
Yes. The factor 0.001 is exact by international definition, not an approximation. Any imprecision comes only from the original measurement, not the conversion.
Looking for the reverse? Convert Tonne to Kilogram
Related Weight (Mass) Converters
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Need a combined format?
- Kg to Pounds and Ounces — combined lb + oz format
- Kg to Stones and Pounds — UK body weight format
Related in other categories:
- G-force to m/s² — Force = mass × acceleration (F = ma)
Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures)
1 lb = 0.45359237 kg by international agreement (1959).
Last reviewed: March 2026
