Unit Conversion Reference 📏🔬
Comprehensive, accessible reference for all common unit conversions. Perfect for students, engineers, and anyone needing quick unit information.
Length / Distance 📐
| Unit | Symbol | Equivalent | Common Use |
|---|---|---|---|
| Millimeter | mm | 0.001 m = 0.0394 in | Small measurements, rain |
| Centimeter | cm | 0.01 m = 0.394 in | Everyday objects, height |
| Meter | m | 1 m = 3.281 ft = 1.094 yd | Standard SI unit, room dimensions |
| Kilometer | km | 1000 m = 0.621 mi | Distance between cities, roads |
| Inch | in | 2.54 cm = 0.0254 m | Screen size, imperial |
| Foot | ft | 12 in = 30.48 cm = 0.305 m | Height, building dimensions |
| Yard | yd | 3 ft = 0.914 m | Football field, fabric |
| Mile | mi | 5280 ft = 1.609 km | Long distances, roads (US) |
Quick conversions: 1 m ≈ 3.3 ft | 1 km ≈ 0.62 mi | 1 in = 2.54 cm | 1 mi = 1.6 km
Temperature 🌡️
Celsius (°C)
- • Water freezes: 0°C
- • Room temperature: ~20-25°C
- • Body temperature: 37°C
- • Water boils: 100°C
°F = (°C × 9/5) + 32
Fahrenheit (°F)
- • Water freezes: 32°F
- • Room temperature: ~68-77°F
- • Body temperature: 98.6°F
- • Water boils: 212°F
°C = (°F - 32) × 5/9
Kelvin (K) - Scientific
Absolute temperature scale. 0 K = absolute zero (no molecular motion)
- • Absolute zero: 0 K = -273.15°C = -459.67°F
- • Water freezes: 273.15 K
- • Room temperature: ~293-298 K
- • Water boils: 373.15 K
K = °C + 273.15
| °C | °F | K | Description |
|---|---|---|---|
| -40 | -40 | 233 | Extreme cold |
| 0 | 32 | 273 | Water freezes |
| 20 | 68 | 293 | Comfortable room |
| 37 | 98.6 | 310 | Body temperature |
| 100 | 212 | 373 | Water boils |
Electrical Units ⚡
Voltage (V)
Electrical potential difference
- • AA battery: 1.5 V
- • Car battery: 12 V
- • US household: 110-120 V
- • Europe household: 220-240 V
- • High voltage transmission: 500 kV
Current (A)
Flow of electrical charge (Amperes)
- • USB charger: ~2 A
- • Household circuit: 15-20 A
- • Electric car charger: 32-80 A
- • Lightning bolt: ~30,000 A
Power (W)
Rate of energy transfer (Watts)
- • LED bulb: 8-15 W
- • Laptop: 45-100 W
- • Microwave: 1000-1200 W (1-1.2 kW)
- • Electric car: 150-300 kW
- • Power plant: 500-1000 MW
Power (W) = Voltage (V) × Current (A)
Energy (kWh, Wh, J)
Kilowatt-hour (kWh) - energy unit for electricity bills
- • Smartphone battery: 10-20 Wh
- • Laptop battery: 50-100 Wh
- • Electric car battery: 50-100 kWh
- • Average home/month: 800-1000 kWh
1 kWh = 1000 W for 1 hour = 3.6 MJ
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This reference is screen-reader friendly and built by AbleHearts, a charity supporting disabled women Mary & Lydia in Kenya. Every page we build prioritizes accessibility.