Unit Conversion Calculator

Instant conversion across 12 unit categories. Type in either field — results update live.

📏 Length

1 in = 2.54 cm 1 ft = 30.48 cm 1 mile = 1.6093 km 1 nm = 10 Å 1 AU = 1.496 × 1011 m 1 light year = 9.461 × 1015 m
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□ Area

1 in² = 6.452 cm² 1 ft² = 929.03 cm² 1 acre = 0.4047 ha = 4047 m² 1 mile² = 2.590 km² 1 hectare = 10,000 m²
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📦 Volume

1 L = 1000 mL = 1000 cm³ 1 US gal = 3.7854 L 1 imp gal = 4.5461 L 1 US fl oz = 29.574 mL 1 ft³ = 28.317 L
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⚖ Mass

1 lb = 453.59 g = 0.4536 kg 1 oz = 28.35 g 1 stone = 14 lb = 6.350 kg 1 metric ton = 1000 kg 1 troy oz = 31.103 g
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🌡 Temperature

K = °C + 273.15 °F = °C × 9/5 + 32 °R = °F + 459.67 Water freezes: 0°C = 32°F = 273.15 K Water boils: 100°C = 212°F = 373.15 K Absolute zero: −273.15°C = −459.67°F = 0 K
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💨 Speed

1 m/s = 3.6 km/h = 2.237 mph 1 knot = 1.852 km/h = 1.151 mph Mach 1 ≈ 343.2 m/s (at 20°C, sea level) Speed of light = 299,792,458 m/s
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⚡ Energy

1 J = 1 N·m = 1 W·s 1 cal = 4.184 J 1 kcal = 4184 J 1 kWh = 3.6 MJ 1 eV = 1.602 × 10−19 J 1 BTU = 1055.06 J
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🔋 Power

1 W = 1 J/s 1 hp (mech) = 745.70 W 1 hp (metric) = 735.50 W 1 kW = 1000 W 1 BTU/hr = 0.29307 W
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🌡 Pressure

1 atm = 101,325 Pa = 1.01325 bar 1 psi = 6894.76 Pa 1 bar = 100,000 Pa 1 mmHg = 1 torr = 133.322 Pa 1 kPa = 0.14504 psi
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↗ Force

1 N = 1 kg·m/s² 1 lbf = 4.4482 N 1 kgf = 9.80665 N 1 dyne = 10−5 N
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⏱ Time

1 min = 60 s 1 hr = 3600 s 1 day = 86,400 s 1 Julian year = 365.25 days = 31,557,600 s 1 ns = 10−9 s
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∠ Angle

π rad = 180° 1 rad = 57.2958° 1° = 60 arcmin = 3600 arcsec 1 revolution = 360° = 2π rad 1 gradian = 0.9°
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