單位換算表大全
Unit Conversion Tables & Charts: Your Complete Reference Guide
Need a quick conversion without calculating? This comprehensive reference guide provides conversion tables for every common measurement system. Whether you're cooking, building, studying physics, or traveling internationally, these charts give you instant answers.
This guide includes length, weight, volume, temperature, area, pressure, power, and specialized tables for cooking and construction. All tables show both exact and rounded values for practical use. Bookmark this page or print the tables you need most!
For instant conversions with precision, use our Unit Converter tool with built-in calculation!
How to Use These Conversion Tables
Reading the Tables
Two-Way Conversions:
Most tables show bidirectional conversions. Find your starting unit in the row, read across to your target unit.
Example:
Length Table: 1 meter = 3.281 feet
To convert: 5 meters × 3.281 = 16.405 feet
Exact vs Rounded Values:
- Exact: Used in scientific/engineering contexts
- Rounded: Practical for everyday estimates
- Tables show both when precision matters
Dimensional Factors:
- Linear (length, time): Use factor directly
- Area: Square the linear factor (1 m = 3.281 ft → 1 m² = 10.764 ft²)
- Volume: Cube the linear factor (1 m = 3.281 ft → 1 m³ = 35.315 ft³)
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slug: "conversion-table-reading-guide-diagram",
alt: "Diagram showing how to read conversion table with arrows pointing from row to column with multiplication example",
caption: "Find starting unit in row, multiply by factor in target column. Reverse conversion: divide instead of multiply."
}}
Length Conversion Table
Convert between metric, imperial, and US customary length units.
Primary Length Conversions
| From ↓ To → | Millimeters | Centimeters | Meters | Kilometers | Inches | Feet | Yards | Miles |
|---|---|---|---|---|---|---|---|---|
| 1 Millimeter | 1 | 0.1 | 0.001 | 0.000001 | 0.03937 | 0.003281 | 0.001094 | 6.214×10⁻⁷ |
| 1 Centimeter | 10 | 1 | 0.01 | 0.00001 | 0.3937 | 0.03281 | 0.01094 | 6.214×10⁻⁶ |
| 1 Meter | 1,000 | 100 | 1 | 0.001 | 39.37 | 3.281 | 1.094 | 0.0006214 |
| 1 Kilometer | 1,000,000 | 100,000 | 1,000 | 1 | 39,370 | 3,281 | 1,094 | 0.6214 |
| 1 Inch | 25.4 | 2.54 | 0.0254 | 0.0000254 | 1 | 0.08333 | 0.02778 | 1.578×10⁻⁵ |
| 1 Foot | 304.8 | 30.48 | 0.3048 | 0.0003048 | 12 | 1 | 0.3333 | 0.0001894 |
| 1 Yard | 914.4 | 91.44 | 0.9144 | 0.0009144 | 36 | 3 | 1 | 0.0005682 |
| 1 Mile | 1,609,344 | 160,934 | 1,609 | 1.609 | 63,360 | 5,280 | 1,760 | 1 |
Common Length Conversions (Rounded for Quick Reference)
| Convert | Multiply By | Example |
|---|---|---|
| Inches → Centimeters | 2.54 | 10 in × 2.54 = 25.4 cm |
| Centimeters → Inches | 0.394 | 50 cm × 0.394 = 19.7 in |
| Feet → Meters | 0.305 | 20 ft × 0.305 = 6.1 m |
| Meters → Feet | 3.281 | 10 m × 3.281 = 32.81 ft |
| Yards → Meters | 0.914 | 100 yd × 0.914 = 91.4 m |
| Meters → Yards | 1.094 | 100 m × 1.094 = 109.4 yd |
| Miles → Kilometers | 1.609 | 50 mi × 1.609 = 80.45 km |
| Kilometers → Miles | 0.621 | 100 km × 0.621 = 62.1 mi |
Quick Mental Math:
- Inches ↔ cm: Multiply/divide by 2.5 (close enough)
- Feet ↔ meters: 1 ft ≈ 0.3 m, 1 m ≈ 3 ft (within 10%)
- Miles ↔ km: 5 miles ≈ 8 km (Fibonacci approximation!)
{illustration: {
slug: "length-conversion-visual-scale",
alt: "Visual scale showing common lengths in both metric and imperial with real-world objects for reference",
caption: "Length conversions visualized: 1 inch = 2.54 cm (thumb width), 1 foot = 30 cm (ruler), 1 meter ≈ 3 feet (doorway width)."
}}
Learn detailed length conversions in our Length Conversion Guide.
Weight/Mass Conversion Table
Convert between metric, imperial, and US weight units.
Primary Weight Conversions
| From ↓ To → | Milligrams | Grams | Kilograms | Metric Tons | Ounces | Pounds | Stones | US Tons |
|---|---|---|---|---|---|---|---|---|
| 1 Milligram | 1 | 0.001 | 0.000001 | 1×10⁻⁹ | 0.00003527 | 0.0000022 | 1.57×10⁻⁷ | 1.10×10⁻⁹ |
| 1 Gram | 1,000 | 1 | 0.001 | 0.000001 | 0.03527 | 0.002205 | 0.0001575 | 1.10×10⁻⁶ |
| 1 Kilogram | 1,000,000 | 1,000 | 1 | 0.001 | 35.27 | 2.205 | 0.1575 | 0.001102 |
| 1 Metric Ton | 1×10⁹ | 1,000,000 | 1,000 | 1 | 35,274 | 2,205 | 157.5 | 1.102 |
| 1 Ounce | 28,350 | 28.35 | 0.02835 | 0.00002835 | 1 | 0.0625 | 0.004464 | 0.00003125 |
| 1 Pound | 453,592 | 453.6 | 0.4536 | 0.0004536 | 16 | 1 | 0.07143 | 0.0005 |
| 1 Stone | 6,350,293 | 6,350 | 6.350 | 0.00635 | 224 | 14 | 1 | 0.007 |
| 1 US Ton | 907,185,000 | 907,185 | 907.2 | 0.9072 | 32,000 | 2,000 | 142.9 | 1 |
Common Weight Conversions (Rounded)
| Convert | Multiply By | Example |
|---|---|---|
| Ounces → Grams | 28.35 | 10 oz × 28.35 = 283.5 g |
| Grams → Ounces | 0.03527 | 500 g × 0.03527 = 17.6 oz |
| Pounds → Kilograms | 0.4536 | 150 lbs × 0.4536 = 68 kg |
| Kilograms → Pounds | 2.205 | 70 kg × 2.205 = 154.4 lbs |
| Stones → Kilograms | 6.350 | 10 stone × 6.350 = 63.5 kg |
| Kilograms → Stones | 0.1575 | 80 kg × 0.1575 = 12.6 stone |
| Metric Tons → US Tons | 1.102 | 5 t × 1.102 = 5.51 US tons |
| US Tons → Metric Tons | 0.9072 | 10 US tons × 0.9072 = 9.07 t |
Quick Mental Math:
- kg ↔ lbs: 1 kg ≈ 2.2 lbs (easy to remember)
- oz ↔ grams: 1 oz ≈ 30 g (within 5%)
- Body weight: 70 kg ≈ 154 lbs, 150 lbs ≈ 68 kg
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slug: "weight-conversion-common-items",
alt: "Illustration showing common items with weights in both metric and imperial units",
caption: "Weight references: 1 oz ≈ slice of bread, 1 lb ≈ can of soup, 1 kg ≈ 2 lb bag of sugar, 70 kg ≈ average adult."
}}
Learn detailed weight conversions in our Weight Conversion Guide.
Temperature Conversion Table
Convert between Celsius, Fahrenheit, and Kelvin.
Common Temperature Points
| Description | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Liquid nitrogen | -196 | -321 | 77 |
| Dry ice | -78 | -109 | 195 |
| Freezer | -18 | 0 | 255 |
| Water freezes | 0 | 32 | 273.15 |
| Cold day | 5 | 41 | 278 |
| Cool room | 15 | 59 | 288 |
| Room temperature | 20 | 68 | 293 |
| Warm day | 25 | 77 | 298 |
| Hot day | 30 | 86 | 303 |
| Body temperature | 37 | 98.6 | 310 |
| Hot bath | 40 | 104 | 313 |
| Heat wave | 45 | 113 | 318 |
| Water boils | 100 | 212 | 373.15 |
| Low oven | 150 | 300 | 423 |
| Moderate oven | 175 | 350 | 448 |
| Hot oven | 200 | 400 | 473 |
| Very hot oven | 230 | 450 | 503 |
Temperature Conversion Formulas
| From → To | Formula | Example |
|---|---|---|
| °C → °F | °F = (°C × 1.8) + 32 | 20°C = (20 × 1.8) + 32 = 68°F |
| °F → °C | °C = (°F - 32) ÷ 1.8 | 68°F = (68 - 32) ÷ 1.8 = 20°C |
| °C → K | K = °C + 273.15 | 20°C = 20 + 273.15 = 293.15 K |
| K → °C | °C = K - 273.15 | 300 K = 300 - 273.15 = 26.85°C |
| °F → K | K = (°F - 32) ÷ 1.8 + 273.15 | 68°F = (68-32)÷1.8+273.15 = 293.15 K |
| K → °F | °F = (K - 273.15) × 1.8 + 32 | 300 K = (300-273.15)×1.8+32 = 80.3°F |
Quick Celsius to Fahrenheit Reference
| °C | °F | °C | °F | °C | °F | °C | °F |
|---|---|---|---|---|---|---|---|
| -40 | -40 | 0 | 32 | 20 | 68 | 60 | 140 |
| -30 | -22 | 5 | 41 | 25 | 77 | 70 | 158 |
| -20 | -4 | 10 | 50 | 30 | 86 | 80 | 176 |
| -10 | 14 | 15 | 59 | 37 | 98.6 | 90 | 194 |
| 0 | 32 | 18 | 64 | 40 | 104 | 100 | 212 |
Quick Mental Math:
- °C → °F: Double and add 30 (accurate within 10%)
- Example: 20°C → (20×2)+30 = 70°F (actual: 68°F)
- °F → °C: Subtract 30 and halve
- Example: 70°F → (70-30)÷2 = 20°C (actual: 21°C)
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slug: "temperature-scales-comparison-chart",
alt: "Three thermometers side-by-side showing Celsius, Fahrenheit, and Kelvin scales with key points marked",
caption: "Temperature scales aligned: Water freezes at 0°C/32°F/273K, boils at 100°C/212°F/373K. Room temp ≈ 20°C/68°F/293K."
}}
Learn detailed temperature conversions in our Temperature Conversion Guide.
Volume Conversion Table
Convert between metric, imperial, and US volume units.
Primary Volume Conversions
| From ↓ To → | mL | Liters | m³ | Tsp (US) | Tbsp (US) | Fl oz (US) | Cups (US) | Pints (US) | Quarts (US) | Gallons (US) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 mL | 1 | 0.001 | 0.000001 | 0.203 | 0.0676 | 0.0338 | 0.00423 | 0.00211 | 0.00106 | 0.000264 |
| 1 Liter | 1,000 | 1 | 0.001 | 202.9 | 67.63 | 33.81 | 4.227 | 2.113 | 1.057 | 0.2642 |
| 1 m³ | 1,000,000 | 1,000 | 1 | 202,884 | 67,628 | 33,814 | 4,227 | 2,113 | 1,057 | 264.2 |
| 1 Tsp (US) | 4.929 | 0.004929 | 4.93×10⁻⁶ | 1 | 0.3333 | 0.1667 | 0.0208 | 0.0104 | 0.00521 | 0.00130 |
| 1 Tbsp (US) | 14.79 | 0.01479 | 1.48×10⁻⁵ | 3 | 1 | 0.5 | 0.0625 | 0.03125 | 0.01563 | 0.00391 |
| 1 Fl oz (US) | 29.57 | 0.02957 | 2.96×10⁻⁵ | 6 | 2 | 1 | 0.125 | 0.0625 | 0.03125 | 0.00781 |
| 1 Cup (US) | 236.6 | 0.2366 | 0.000237 | 48 | 16 | 8 | 1 | 0.5 | 0.25 | 0.0625 |
| 1 Pint (US) | 473.2 | 0.4732 | 0.000473 | 96 | 32 | 16 | 2 | 1 | 0.5 | 0.125 |
| 1 Quart (US) | 946.4 | 0.9464 | 0.000946 | 192 | 64 | 32 | 4 | 2 | 1 | 0.25 |
| 1 Gallon (US) | 3,785 | 3.785 | 0.003785 | 768 | 256 | 128 | 16 | 8 | 4 | 1 |
Common Volume Conversions (Rounded)
| Convert | Multiply By | Example |
|---|---|---|
| mL → Fl oz (US) | 0.0338 | 500 mL × 0.0338 = 16.9 fl oz |
| Fl oz (US) → mL | 29.57 | 8 fl oz × 29.57 = 236.6 mL |
| Cups (US) → mL | 236.6 | 2 cups × 236.6 = 473.2 mL |
| mL → Cups (US) | 0.00423 | 250 mL × 0.00423 = 1.06 cups |
| Liters → Gallons (US) | 0.264 | 20 L × 0.264 = 5.28 gal |
| Gallons (US) → Liters | 3.785 | 10 gal × 3.785 = 37.85 L |
| Pints (US) → Liters | 0.473 | 4 pints × 0.473 = 1.89 L |
| Liters → Pints (US) | 2.113 | 1 L × 2.113 = 2.11 pints |
Quick Mental Math:
- Liters ↔ gallons: 4 L ≈ 1 gallon (within 5%)
- mL ↔ fl oz: 30 mL ≈ 1 fl oz
- Cup ↔ mL: 1 cup ≈ 240 mL (close enough for cooking)
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caption: "Volume comparisons: 1 tsp = 5 mL, 1 cup = 237 mL, 1 quart ≈ 1 liter (946 mL), 1 gallon = 3.785 L."
}}
Learn detailed volume conversions in our Volume Conversion Guide.
Area Conversion Table
Convert between metric and imperial area units. Remember: Use squared factors!
Primary Area Conversions
| From ↓ To → | mm² | cm² | m² | km² | Hectares | In² | Ft² | Yd² | Acres | Miles² |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 mm² | 1 | 0.01 | 0.000001 | 1×10⁻¹² | 1×10⁻¹⁰ | 0.00155 | 1.08×10⁻⁵ | 1.20×10⁻⁶ | 2.47×10⁻¹⁰ | 3.86×10⁻¹³ |
| 1 cm² | 100 | 1 | 0.0001 | 1×10⁻¹⁰ | 1×10⁻⁸ | 0.155 | 0.00108 | 0.00012 | 2.47×10⁻⁸ | 3.86×10⁻¹¹ |
| 1 m² | 1,000,000 | 10,000 | 1 | 0.000001 | 0.0001 | 1,550 | 10.764 | 1.196 | 0.000247 | 3.86×10⁻⁷ |
| 1 km² | 1×10¹² | 1×10¹⁰ | 1,000,000 | 1 | 100 | 1.55×10⁹ | 1.076×10⁷ | 1.196×10⁶ | 247.1 | 0.386 |
| 1 Hectare | 1×10¹⁰ | 1×10⁸ | 10,000 | 0.01 | 1 | 1.55×10⁷ | 107,639 | 11,960 | 2.471 | 0.00386 |
| 1 In² | 645.2 | 6.452 | 0.000645 | 6.45×10⁻¹⁰ | 6.45×10⁻⁸ | 1 | 0.00694 | 0.000772 | 1.59×10⁻⁷ | 2.49×10⁻¹⁰ |
| 1 Ft² | 92,903 | 929 | 0.0929 | 9.29×10⁻⁸ | 9.29×10⁻⁶ | 144 | 1 | 0.111 | 0.000023 | 3.59×10⁻⁸ |
| 1 Yd² | 836,127 | 8,361 | 0.8361 | 8.36×10⁻⁷ | 8.36×10⁻⁵ | 1,296 | 9 | 1 | 0.000207 | 3.23×10⁻⁷ |
| 1 Acre | 4.05×10⁹ | 4.05×10⁷ | 4,047 | 0.00405 | 0.4047 | 6.27×10⁶ | 43,560 | 4,840 | 1 | 0.00156 |
| 1 Mile² | 2.59×10¹² | 2.59×10¹⁰ | 2,590,000 | 2.590 | 259.0 | 4.01×10⁹ | 2.79×10⁷ | 3.10×10⁶ | 640 | 1 |
Common Area Conversions (Rounded)
| Convert | Multiply By | Example |
|---|---|---|
| m² → Ft² | 10.764 | 100 m² × 10.764 = 1,076.4 ft² |
| Ft² → m² | 0.0929 | 1,000 ft² × 0.0929 = 92.9 m² |
| Acres → Hectares | 0.4047 | 5 acres × 0.4047 = 2.02 ha |
| Hectares → Acres | 2.471 | 10 ha × 2.471 = 24.71 acres |
| km² → Miles² | 0.386 | 100 km² × 0.386 = 38.6 mi² |
| Miles² → km² | 2.590 | 50 mi² × 2.590 = 129.5 km² |
Critical Reminder: Area uses SQUARED conversion factors!
- Linear: 1 m = 3.281 ft
- Area: 1 m² = 10.764 ft² (3.281² = 10.764)
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alt: "Diagram showing why area factors are squared with 1 meter square grid compared to feet grid",
caption: "Area factor is squared: 1 m = 3.281 ft, so 1 m² = 3.281² = 10.764 ft². Don't use 3.281 for area!"
}}
Learn detailed area conversions in our Area Conversion Guide.
Pressure Conversion Table
Convert between metric, imperial, and specialized pressure units.
Primary Pressure Conversions
| From ↓ To → | Pascal (Pa) | kPa | Bar | Atmosphere | PSI | mmHg (Torr) | inHg |
|---|---|---|---|---|---|---|---|
| 1 Pascal | 1 | 0.001 | 0.00001 | 9.87×10⁻⁶ | 0.000145 | 0.0075 | 0.000296 |
| 1 kPa | 1,000 | 1 | 0.01 | 0.00987 | 0.145 | 7.501 | 0.296 |
| 1 Bar | 100,000 | 100 | 1 | 0.987 | 14.504 | 750.1 | 29.53 |
| 1 Atmosphere | 101,325 | 101.325 | 1.01325 | 1 | 14.696 | 760 | 29.92 |
| 1 PSI | 6,895 | 6.895 | 0.06895 | 0.06805 | 1 | 51.715 | 2.036 |
| 1 mmHg (Torr) | 133.3 | 0.1333 | 0.001333 | 0.001316 | 0.01934 | 1 | 0.03937 |
| 1 inHg | 3,386 | 3.386 | 0.03386 | 0.03342 | 0.4912 | 25.4 | 1 |
Common Pressure Conversions (Rounded)
| Convert | Multiply By | Example |
|---|---|---|
| PSI → kPa | 6.895 | 30 PSI × 6.895 = 206.8 kPa |
| kPa → PSI | 0.145 | 200 kPa × 0.145 = 29 PSI |
| Bar → PSI | 14.504 | 2.5 bar × 14.504 = 36.3 PSI |
| PSI → Bar | 0.06895 | 35 PSI × 0.06895 = 2.41 bar |
| atm → PSI | 14.696 | 2 atm × 14.696 = 29.4 PSI |
| PSI → atm | 0.06805 | 45 PSI × 0.06805 = 3.06 atm |
Quick Mental Math:
- PSI ↔ bar: Divide/multiply by 14-15 (within 3%)
- kPa ↔ PSI: Divide/multiply by 7 (within 5%)
- 1 atmosphere ≈ 100 kPa ≈ 15 PSI ≈ 1 bar (easy reference)
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slug: "pressure-units-comparison-gauge",
alt: "Pressure gauge showing PSI, bar, kPa, and atmosphere markings with common pressures labeled",
caption: "Pressure references: Sea level = 101 kPa = 14.7 PSI = 1 atm. Car tire = 220 kPa = 32 PSI = 2.2 bar."
}}
Learn detailed pressure conversions in our Pressure Conversion Guide.
Power & Energy Conversion Table
Convert between watts, horsepower, BTU, and joules.
Power Conversions
| From ↓ To → | Watts (W) | Kilowatts (kW) | Horsepower (HP) | BTU/hr |
|---|---|---|---|---|
| 1 Watt | 1 | 0.001 | 0.001341 | 3.412 |
| 1 Kilowatt | 1,000 | 1 | 1.341 | 3,412 |
| 1 Horsepower | 745.7 | 0.7457 | 1 | 2,544 |
| 1 BTU/hr | 0.2931 | 0.0002931 | 0.000393 | 1 |
Energy Conversions
| From ↓ To → | Joules (J) | kWh | Calories (cal) | Calories (Cal/kcal) | BTU | eV |
|---|---|---|---|---|---|---|
| 1 Joule | 1 | 2.78×10⁻⁷ | 0.239 | 0.000239 | 0.000948 | 6.24×10¹⁸ |
| 1 kWh | 3,600,000 | 1 | 860,421 | 860.4 | 3,412 | 2.25×10²⁵ |
| 1 Calorie (cal) | 4.184 | 1.16×10⁻⁶ | 1 | 0.001 | 0.003968 | 2.61×10¹⁹ |
| 1 Calorie (Cal/kcal) | 4,184 | 0.001162 | 1,000 | 1 | 3.968 | 2.61×10²² |
| 1 BTU | 1,055 | 0.0002931 | 252 | 0.252 | 1 | 6.58×10²¹ |
| 1 eV | 1.602×10⁻¹⁹ | 4.45×10⁻²⁶ | 3.83×10⁻²⁰ | 3.83×10⁻²³ | 1.52×10⁻²² | 1 |
Quick References:
- 1 HP ≈ 750 W (close enough for estimates)
- 1 kW ≈ 1.3 HP (easy to remember)
- 1 kWh = 3.6 MJ (megajoules)
Learn more in our Power Conversion Guide and Energy Conversion Guide.
Cooking Measurement Conversion Table
Essential conversions for recipes and food preparation.
Volume Conversions (Cooking)
| From ↓ To → | Teaspoon | Tablespoon | Fl oz | Cup | Pint | Quart | Gallon | mL |
|---|---|---|---|---|---|---|---|---|
| 1 Teaspoon | 1 | 0.333 | 0.167 | 0.021 | 0.010 | 0.005 | 0.001 | 4.93 |
| 1 Tablespoon | 3 | 1 | 0.5 | 0.0625 | 0.031 | 0.016 | 0.004 | 14.79 |
| 1 Fl oz | 6 | 2 | 1 | 0.125 | 0.0625 | 0.031 | 0.008 | 29.57 |
| 1 Cup | 48 | 16 | 8 | 1 | 0.5 | 0.25 | 0.0625 | 236.6 |
| 1 Pint | 96 | 32 | 16 | 2 | 1 | 0.5 | 0.125 | 473.2 |
| 1 Quart | 192 | 64 | 32 | 4 | 2 | 1 | 0.25 | 946.4 |
| 1 Gallon | 768 | 256 | 128 | 16 | 8 | 4 | 1 | 3,785 |
Cups to Grams (Common Ingredients)
| Ingredient | 1 Cup (g) | 1/2 Cup (g) | 1/4 Cup (g) | 1 Tbsp (g) |
|---|---|---|---|---|
| All-purpose flour | 120 | 60 | 30 | 7.5 |
| Bread flour | 127 | 64 | 32 | 8 |
| Whole wheat flour | 113 | 57 | 28 | 7 |
| Granulated sugar | 200 | 100 | 50 | 12.5 |
| Brown sugar (packed) | 220 | 110 | 55 | 14 |
| Powdered sugar | 120 | 60 | 30 | 7.5 |
| Butter | 227 | 114 | 57 | 14 |
| Vegetable oil | 218 | 109 | 55 | 14 |
| Honey | 340 | 170 | 85 | 21 |
| Milk | 245 | 123 | 61 | 15 |
| Water | 237 | 119 | 59 | 15 |
| Rice (uncooked) | 185 | 93 | 46 | 12 |
| Cocoa powder | 100 | 50 | 25 | 6 |
| Chocolate chips | 170 | 85 | 43 | 11 |
Critical Reminder: Cup-to-gram conversions depend on ingredient density! Always specify the ingredient when converting.
Learn complete cooking conversions in our Cooking Unit Converter Guide.
Speed/Velocity Conversion Table
Convert between metric, imperial, and specialized velocity units.
Common Speed Conversions
| From ↓ To → | m/s | km/h | mph | ft/s | Knots | Mach (sea level) |
|---|---|---|---|---|---|---|
| 1 m/s | 1 | 3.6 | 2.237 | 3.281 | 1.944 | 0.00291 |
| 1 km/h | 0.2778 | 1 | 0.6214 | 0.9113 | 0.5400 | 0.000809 |
| 1 mph | 0.4470 | 1.609 | 1 | 1.467 | 0.8690 | 0.00130 |
| 1 ft/s | 0.3048 | 1.097 | 0.6818 | 1 | 0.5925 | 0.000887 |
| 1 Knot | 0.5144 | 1.852 | 1.151 | 1.688 | 1 | 0.00150 |
| 1 Mach | 343 | 1,235 | 767 | 1,125 | 667 | 1 |
Speed References:
- Walking: 1.4 m/s = 5 km/h = 3.1 mph
- Jogging: 3 m/s = 11 km/h = 6.7 mph
- Sprint: 10 m/s = 36 km/h = 22 mph (Usain Bolt)
- Highway: 28 m/s = 100 km/h = 62 mph
- Speed of sound: 343 m/s = 1,235 km/h = 767 mph (Mach 1)
Using Our Unit Converter Tool
These tables provide quick reference, but for precision calculations use our Unit Converter.
Tool Advantages:
✓ Instant bidirectional conversions
✓ Multiple units simultaneously
✓ Copy results to clipboard
✓ Mobile-friendly interface
✓ Saves recent conversions
✓ 100% accurate calculations
✓ Works offline (PWA)
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Printable Conversion Charts
How to Print These Tables
For Best Results:
1. Select specific table(s) you need most
2. Print to PDF first (preview before paper)
3. Adjust margins to fit more content
4. Use landscape orientation for wide tables
5. Consider laminating frequently-used charts
Suggested Collections:
- Kitchen: Cooking measurements, temperature
- Workshop: Length, area, volume (metric ↔ imperial)
- Science: Length, weight, energy, power
- Travel: Temperature, distance, volume (fuel)
Related Conversion Guides
Explore detailed guides for each conversion type:
- Unit Converter Complete Guide - Comprehensive overview
- Length Conversion Guide - Detailed length formulas
- Weight Conversion Guide - Weight/mass conversions
- Temperature Conversion Guide - Temperature formulas
- Volume Conversion Guide - Volume calculations
- Cooking Unit Converter - Recipe conversions
- Best Unit Converter Apps 2025 - Mobile tools review
Need Technical Documentation? Check our Unit Converter Implementation guide.
Conclusion: Your Conversion Reference Library
These comprehensive conversion tables provide instant lookup for:
- Everyday tasks: Cooking, travel, shopping
- Professional work: Construction, engineering, science
- Education: Homework, lab work, exam prep
- International communication: Converting between regional standards
Key Takeaways:
1. Bookmark this page for quick reference anytime
2. Print relevant tables for offline use
3. Remember squared/cubed factors for area/volume
4. Use exact values for precision work, rounded for estimates
5. Double-check critical conversions with calculator
Most Common Conversions to Memorize:
- 1 inch = 2.54 cm (exact)
- 1 kg ≈ 2.2 lbs
- 1 mile ≈ 1.6 km
- °F = (°C × 1.8) + 32
- 1 liter ≈ 0.26 gallons
- 1 m² ≈ 10.8 ft²
For precision calculations beyond table lookup, use our Unit Converter tool with built-in formulas and exact conversion factors!
Frequently Asked Questions
Q: What is the easiest way to convert units?
A: Use a comprehensive conversion table or digital converter. For common conversions, memorize key factors: 1 inch = 2.54 cm, 1 kg = 2.205 lbs, 1 mile = 1.609 km, °F = (°C × 1.8) + 32.
Q: How do I convert between metric and imperial?
A: Use conversion factors: Length: 1 m = 3.281 ft, Weight: 1 kg = 2.205 lbs, Volume: 1 L = 0.264 gal, Temperature: °C = (°F - 32) ÷ 1.8. Multiply or divide accordingly.
Q: Where can I find printable conversion charts?
A: This guide provides comprehensive tables you can print or save. Tables include length, weight, volume, temperature, area, pressure, power, and cooking conversions with both exact and rounded values.
Q: What's the most common conversion mistake?
A: Confusing squared/cubed factors for area and volume. For example: 1 m = 3.281 ft, but 1 m² = 10.764 ft² (squared factor), and 1 m³ = 35.315 ft³ (cubed factor). Always apply the correct dimensional factor!
Q: Why do some tables show different values for the same conversion?
A: Exact vs rounded values. Exact: 1 inch = 2.54 cm (exactly by definition). Rounded: 1 inch ≈ 2.5 cm (practical estimate). Use exact for precision, rounded for quick mental math.
Q: How do I convert cooking measurements accurately?
A: Cooking conversions depend on ingredient density. 1 cup flour = 120g, but 1 cup sugar = 200g. Always use ingredient-specific conversions from cooking tables. Never assume 1 cup = constant grams for all foods!
Q: What conversions should I memorize?
A: Top 5: (1) 1 inch = 2.54 cm, (2) 1 kg ≈ 2.2 lbs, (3) 1 mile ≈ 1.6 km, (4) °F = (°C × 1.8) + 32, (5) 1 liter ≈ 0.26 gallons. These cover 80% of everyday conversion needs.
Q: Can I use these tables for scientific work?
A: Yes, but use exact values (provided in tables) rather than rounded ones. For critical calculations, verify with a digital converter or calculator to avoid rounding errors that compound through multiple conversions.