1. The Basics of Unit Conversion

Unit conversion’s all about turning one measurement into another. You’ll use it in science, engineering, business, or even daily life. Just know the right ratios or formulas and you’re good to go.

What to Remember

• Match types: Length converts to length, weight to weight, etc.
• Conversion factor: That’s your multiplier — like 1 inch = 2.54 cm.
• Keep things consistent: Always make sure your units cancel out properly when multiplying or dividing.

Quick Method

To convert from A to B, just multiply by the factor. Example: 10 inches × 2.54 = 25.4 cm. Easy.

2. Length & Distance

Here’s a few everyday conversions you’ll run into:

• 1 m = 100 cm = 1000 mm
• 1 km = 1000 m
• 1 inch = 2.54 cm
• 1 foot = 12 in = 0.3048 m
• 1 yard = 3 ft = 0.9144 m
• 1 mile ≈ 1,609.344 m

Examples

5 miles → 8.05 km

72 inches → 1.83 m

Pro Tips

• Stick to metric for science — it’s cleaner and simpler.
• Keep an eye out for mixed systems — some packaging or signs still use imperial.

3. Weight & Mass

Weight conversions are everywhere — from the gym to the kitchen.

• 1 kg = 1000 g
• 1 lb = 0.4536 kg
• 1 oz = 28.35 g
• 1 stone = 14 lbs ≈ 6.35 kg

Example

150 lbs × 0.4536 = 68.0 kg

Tip

Round sensibly — for recipes or workouts, 2–3 digits is fine.

4. Volume & Capacity

Need to measure liquids? Here’s your cheat sheet:

• 1 L = 1000 mL
• 1 m³ = 1000 L
• 1 US gallon = 3.785 L
• 1 US pint = 0.473 L
• 1 UK gallon = 4.546 L

Example

2.5 US gallons × 3.785 = 9.46 L

5. Temperature

Temperature conversions are a little tricky since you’ve gotta scale and shift values.

• °C → °F: (°C × 9/5) + 32
• °F → °C: (°F − 32) × 5/9
• °C → K: °C + 273.15

Examples

25 °C = 77 °F

98.6 °F = 37 °C

6. Area

• 1 m² = 10.76 ft²
• 1 hectare = 2.47 acres
• 1 acre = 4046.86 m²

Example

5 acres = 20,234.3 m²

7. Speed & Velocity

• 1 m/s = 3.6 km/h
• 1 mph ≈ 1.609 km/h

Example: 60 mph = 26.8 m/s

8. Pressure

• 1 atm = 101,325 Pa
• 1 psi ≈ 6894.76 Pa

Example: 14.7 psi ≈ 101,325 Pa (atmospheric pressure).

9. Energy & Power

• 1 cal = 4.184 J
• 1 kcal = 4184 J
• 1 kWh = 3.6 million J

Example: 500 kcal = 2092 kJ

10. Data Storage

• 1 KB = 1024 bytes
• 1 MB = 1024 KB
• 1 GB = 1024 MB

Remember: Hard drives use 1000, computers use 1024 — sneaky difference!

12. BMI Calculator — Quick Body Check

BMI’s a simple way to see if your weight’s in a healthy range for your height.

BMI = weight(kg) / (height(m))^2

• Underweight: < 18.5
• Normal: 18.5–24.9
• Overweight: 25–29.9
• Obese: 30+

Example: 70 kg / (1.75²) = 22.86 → Normal weight.

13. Age Calculator — Figure Out How Long You’ve Been Around

Want your age in years, months, and days? This tool breaks it down for you.

1. Enter your birthdate.
2. We compare it with today’s date.
3. Done — you get your exact age.

14. Currency Converter — Turn Dollars into Anything

Need to switch money between currencies? Use this to stay on top of the latest rates.

target = source * rate(source→target)

Example: 1 USD = 0.92 EUR → 100 USD = 92 EUR.

20. Final Thoughts

Unit conversion’s one of those things you use more than you realize. Whether you’re building something, cooking, budgeting, or traveling — knowing how to switch between systems saves time, money, and mistakes. Our tools keep it fast, accurate, and easy for everyone.