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Units Conversion Charts & Calculator
The following unit conversion tables and interactive calculator have been prepared after careful analysis of various regulatory documents. You can be assured that these tables comply with the latest IEC, ISA, IEE, BS and NEC standards. Use the live calculator to convert any value instantly, or refer to the reference tables below for quick lookups — covering length, area, mass, volume, temperature, pressure, speed, torque, and SI prefixes.
Live Unit Converter
📏 Units of Length
| Millimeters | Centimeters | Meters | Kilometers | Inches | Feet | Yards | Miles |
|---|---|---|---|---|---|---|---|
| mm | cm | m | km | in | ft | yd | mi |
| 1 | 0.1 | 0.001 | 0.000001 | 0.03937 | 0.003281 | 0.001094 | 6.21×10⁻⁷ |
| 10 | 1 | 0.01 | 0.00001 | 0.393701 | 0.032808 | 0.010936 | 0.000006 |
| 1000 | 100 | 1 | 0.001 | 39.37008 | 3.28084 | 1.093613 | 0.000621 |
| 1000000 | 100000 | 1000 | 1 | 39370.08 | 3280.84 | 1093.613 | 0.621371 |
| 25.4 | 2.54 | 0.0254 | 0.000025 | 1 | 0.083333 | 0.027778 | 0.000016 |
| 304.8 | 30.48 | 0.3048 | 0.000305 | 12 | 1 | 0.333333 | 0.000189 |
| 914.4 | 91.44 | 0.9144 | 0.000914 | 36 | 3 | 1 | 0.000568 |
| 1609344 | 160934.4 | 1609.344 | 1.609344 | 63360 | 5280 | 1760 | 1 |
Table 1 — Length units | CheckBillOnline.com
⬛ Units of Area
| Millimeter square | Centimeter square | Meter square | Inch square | Foot square | Yard square |
|---|---|---|---|---|---|
| mm² | cm² | m² | in² | ft² | yd² |
| 1 | 0.01 | 0.000001 | 0.00155 | 0.000011 | 0.000001 |
| 100 | 1 | 0.0001 | 0.155 | 0.001076 | 0.00012 |
| 1000000 | 10000 | 1 | 1550.003 | 10.76391 | 1.19599 |
| 645.16 | 6.4516 | 0.000645 | 1 | 0.006944 | 0.000772 |
| 92903 | 929.0304 | 0.092903 | 144 | 1 | 0.111111 |
| 836127 | 8361.274 | 0.836127 | 1296 | 9 | 1 |
Table 2 — Area units | CheckBillOnline.com
⚖️ Units of Mass
| Grams | Kilograms | Metric tonnes | Short ton | Long ton | Pounds | Ounces |
|---|---|---|---|---|---|---|
| g | kg | tonne | shton | Lton | lb | oz |
| 1 | 0.001 | 0.000001 | 0.000001 | 9.84×10⁻⁷ | 0.002205 | 0.035273 |
| 1000 | 1 | 0.001 | 0.001102 | 0.000984 | 2.204586 | 35.27337 |
| 1000000 | 1000 | 1 | 1.102293 | 0.984252 | 2204.586 | 35273.37 |
| 907200 | 907.2 | 0.9072 | 1 | 0.892913 | 2000 | 32000 |
| 1016000 | 1016 | 1.016 | 1.119929 | 1 | 2239.859 | 35837.74 |
| 453.6 | 0.4536 | 0.000454 | 0.0005 | 0.000446 | 1 | 16 |
| 28 | 0.02835 | 0.000028 | 0.000031 | 0.000028 | 0.0625 | 1 |
Table 3 — Mass units | CheckBillOnline.com
🧪 Units of Volume
| Centimeter cube | Meter cube | Liter | Inch cube | Foot cube | US gallons | Imperial gallons | US barrel (oil) |
|---|---|---|---|---|---|---|---|
| cm³ | m³ | ltr | in³ | ft³ | US gal | Imp. gal | US brl |
| 1 | 0.000001 | 0.001 | 0.061024 | 0.000035 | 0.000264 | 0.00022 | 0.000006 |
| 1000000 | 1 | 1000 | 61024 | 35 | 264 | 220 | 6.29 |
| 1000 | 0.001 | 1 | 61 | 0.035 | 0.264201 | 0.22 | 0.00629 |
| 16.4 | 0.000016 | 0.016387 | 1 | 0.000579 | 0.004329 | 0.003605 | 0.000103 |
| 28317 | 0.028317 | 28.31685 | 1728 | 1 | 7.481333 | 6.229712 | 0.178127 |
| 3785 | 0.003785 | 3.79 | 231 | 0.13 | 1 | 0.832701 | 0.02381 |
| 4545 | 0.004545 | 4.55 | 277 | 0.16 | 1.20 | 1 | 0.028593 |
| 158970 | 0.15897 | 159 | 9701 | 6 | 42 | 35 | 1 |
Table 4 — Volume units | CheckBillOnline.com
🌡️ Temperature Conversion Formulas
| Unit | Conversion Formula |
|---|---|
| Degree Celsius (°C) | (°F − 32) × 5/9 |
| (K − 273.15) | |
| Degree Fahrenheit (°F) | (°C × 9/5) + 32 |
| (1.8 × K) − 459.67 | |
| Kelvin (K) | °C + 273.15 |
| (°F + 459.67) ÷ 1.8 |
Table 5 — Temperature conversion formulas | CheckBillOnline.com
🔴 High Pressure Units
| Bar | Pound/square inch | Kilopascal | Megapascal | Kilogram force/ centimeter square | Millimeter of mercury | Atmospheres |
|---|---|---|---|---|---|---|
| bar | psi | kPa | MPa | kgf/cm² | mm Hg | atm |
| 1 | 14.50326 | 100 | 0.1 | 1.01968 | 750.0188 | 0.987167 |
| 0.06895 | 1 | 6.895 | 0.006895 | 0.070307 | 51.71379 | 0.068065 |
| 0.01 | 0.1450 | 1 | 0.001 | 0.01020 | 7.5002 | 0.00987 |
| 10 | 145.03 | 1000 | 1 | 10.197 | 7500.2 | 9.8717 |
| 0.9807 | 14.22335 | 98.07 | 0.09807 | 1 | 735.5434 | 0.968115 |
| 0.001333 | 0.019337 | 0.13333 | 0.000133 | 0.00136 | 1 | 0.001316 |
| 1.013 | 14.69181 | 101.3 | 0.1013 | 1.032936 | 759.769 | 1 |
Table 6 — High pressure units | CheckBillOnline.com
🟢 Low Pressure Units
| Meter of water | Foot of water | Centimeter of mercury | Inches of mercury | Inches of water | Pascal |
|---|---|---|---|---|---|
| mH₂O | ftH₂O | cmHg | inHg | inH₂O | Pa |
| 1 | 3.280696 | 7.356339 | 2.896043 | 39.36572 | 9806 |
| 0.304813 | 1 | 2.242311 | 0.882753 | 11.9992 | 2989 |
| 0.135937 | 0.445969 | 1 | 0.39368 | 5.351265 | 1333 |
| 0.345299 | 1.13282 | 2.540135 | 1 | 13.59293 | 3386 |
| 0.025403 | 0.083339 | 0.186872 | 0.073568 | 1 | 249.1 |
| 0.000102 | 0.000335 | 0.00075 | 0.000295 | 0.004014 | 1 |
Table 7 — Low pressure units | CheckBillOnline.com
🚀 Units of Speed
| Meter/second | Meter/minute | Kilometer/hour | Foot/second | Foot/minute | Miles/hour |
|---|---|---|---|---|---|
| m/s | m/min | km/h | ft/s | ft/min | mi/h |
| 1 | 59.988 | 3.599712 | 3.28084 | 196.8504 | 2.237136 |
| 0.01667 | 1 | 0.060007 | 0.054692 | 3.281496 | 0.037293 |
| 0.2778 | 16.66467 | 1 | 0.911417 | 54.68504 | 0.621477 |
| 0.3048 | 18.28434 | 1.097192 | 1 | 60 | 0.681879 |
| 0.00508 | 0.304739 | 0.018287 | 0.016667 | 1 | 0.011365 |
| 0.447 | 26.81464 | 1.609071 | 1.466535 | 87.99213 | 1 |
Table 8 — Speed units | CheckBillOnline.com
🔧 Torque Units
| Newton meter | Kilogram force meter | Foot pound | Inch pound |
|---|---|---|---|
| Nm | kgfm | ftlb | inlb |
| 1 | 0.101972 | 0.737561 | 8.850732 |
| 9.80665 | 1 | 7.233003 | 86.79603 |
| 1.35582 | 0.138255 | 1 | 12 |
| 0.112985 | 0.011521 | 0.083333 | 1 |
Table 9 — Torque units | CheckBillOnline.com
🔢 Unit Prefixes in the International System of Units
| Prefix | Symbol | Multiplying Factor |
|---|---|---|
| exa | E | 10¹⁸ or 1 000 000 000 000 000 000 |
| peta | P | 10¹⁵ or 1 000 000 000 000 000 |
| tera | T | 10¹² or 1 000 000 000 000 |
| giga | G | 10⁹ or 1 000 000 000 |
| mega | M | 10⁶ or 1 000 000 |
| kilo | k | 10³ or 1 000 |
| hecto | h | 10² or 100 |
| deca | da | 10 or 10 |
| deci | d | 10⁻¹ or 0.1 |
| centi | c | 10⁻² or 0.01 |
| milli | m | 10⁻³ or 0.001 |
| micro | u | 10⁻⁶ or 0.000 001 |
| nano | n | 10⁻⁹ or 0.000 000 001 |
| pico | p | 10⁻¹² or 0.000 000 000 001 |
| femto | f | 10⁻¹⁵ or 0.000 000 000 000 001 |
| atto | a | 10⁻¹⁸ or 0.000 000 000 000 000 001 |
Table 10 — Multiples and submultiples of SI units | CheckBillOnline.com
📖 Complete Guide to Unit Conversions
Unit conversion is the process of changing a measurement from one system or scale to another without altering its real-world value. Whether you work in engineering, construction, science, cooking, or everyday tasks, knowing how to convert between metric, imperial, and SI units is an essential skill. This free tool from CheckBillOnline.com brings all major unit conversion tables together in one page — no ads, no distractions.
Why do we need unit conversion? Different countries and industries use different measurement systems. The metric system (SI) is the international standard, while the United States still widely uses the imperial system. Engineers must constantly translate between kilograms and pounds, meters and feet, liters and gallons, pascals and psi. Errors in conversion have caused real-world disasters — including the Mars Climate Orbiter crash in 1999 — making accuracy critical.
How to use the Live Calculator above:
- Select your measurement category (e.g., Length, Mass, Speed).
- Type your value in the input box.
- Choose the From unit (what you have) and the To unit (what you want).
- Click Convert to instantly see the result.
- Use the ⇄ swap button to reverse the conversion direction.
For quick reference without entering values, scroll down to the colour-coded conversion tables. Each row shows how a base unit relates to every other unit in the same category. The bold teal cell in each row is the base unit (value = 1). All other values in that row show how many of those units equal 1 of the base unit.
All conversion factors on this page comply with IEC, ISA, IEE, BS, and NEC standards and have been cross-verified against regulatory documentation.
💡 Practical Conversion Examples
- Length: 5 feet = 5 × 0.3048 = 1.524 meters. Useful when reading American building plans with metric tools.
- Mass: 70 kg = 70 × 2.204586 = 154.32 pounds. Common in medical and fitness contexts.
- Volume: 1 US gallon = 3.785 liters. Fill a European car knowing it takes 40 liters? That's about 10.57 US gallons.
- Pressure: Car tyre pressure 32 psi = 32 × 0.06895 = 2.207 bar. European tyre gauges read in bar.
- Speed: Highway speed limit 100 km/h = 100 × 0.621477 = 62.15 mph. Critical for driving abroad.
- Temperature: Body temperature 37 °C = (37 × 9/5) + 32 = 98.6 °F.
- Area: A 10 m² room = 10 × 10.76391 = 107.64 square feet. Useful for international real estate listings.
- Torque: Engine torque 200 Nm = 200 × 0.737561 = 147.5 foot-pounds. Important for automotive specifications.
❓ Frequently Asked Questions (FAQ)
What is the difference between metric and imperial units?
▼
The metric system (SI) is based on powers of 10 and uses units like meters, kilograms, and liters. It is the global scientific and commercial standard. The imperial system uses units like feet, pounds, and gallons, and is still common in the United States, the UK (for some measures), and a few other countries. The metric system is generally easier for calculations because converting between units only requires multiplying or dividing by 10.
How do I convert Celsius to Fahrenheit?
▼
Use the formula: °F = (°C × 9/5) + 32. For example, 25 °C = (25 × 1.8) + 32 = 45 + 32 = 77 °F. To go the other way: °C = (°F − 32) × 5/9. So 98.6 °F = (98.6 − 32) × 5/9 = 66.6 × 0.5556 = 37 °C.
What is a Pascal and when is it used?
▼
A Pascal (Pa) is the SI unit of pressure, equal to one Newton per square meter (N/m²). It is very small — atmospheric pressure at sea level is about 101,325 Pa (or 101.325 kPa). Pascals are used in meteorology, fluid mechanics, and structural engineering. In everyday contexts, kilopascals (kPa) or bar are more common.
How accurate are the conversion factors on this page?
▼
All conversion factors are verified against IEC, ISA, IEE, BS, and NEC standards. They are accurate to 6–7 significant figures, which is sufficient for engineering, construction, science, and everyday use. For highly specialised scientific calculations requiring more decimal places, consult NIST or the relevant standards body directly.
What are SI unit prefixes?
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SI prefixes are standardised multipliers attached to base units. For example, "kilo" means 1,000, so 1 kilometre = 1,000 metres. "Mega" means 1,000,000, and "milli" means 0.001. Prefixes range from atto (10⁻¹⁸) to exa (10¹⁸), enabling compact expression of very large or very small quantities without scientific notation in everyday communication.
Why does the US still use imperial units?
▼
The United States officially adopted the metric system in 1975 through the Metric Conversion Act, but the transition was voluntary and never fully adopted by the public. Deep-rooted cultural familiarity, the cost of transitioning infrastructure, and lack of enforcement mean the imperial system remains dominant in everyday American life, though science, medicine, and the military widely use metric.
Can I use this tool offline?
▼
The reference conversion tables on this page are fully visible without any internet interaction — they are static HTML tables. The Live Calculator also runs entirely in your browser using JavaScript, with no server calls. However, you need an internet connection to initially load the page. Once loaded, you can use the calculator and tables without any further network activity.
What is the difference between a short ton, long ton, and metric tonne?
▼
A metric tonne (tonne) = 1,000 kg = 2,204.6 lb. A short ton (US ton) = 2,000 lb ≈ 907.2 kg. A long ton (UK ton) = 2,240 lb ≈ 1,016 kg. The metric tonne is the international standard; short ton is used in the US; long ton is historically British and still used in some shipping contexts.
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