Size & Measurement Guides
Numbers alone rarely tell you how big something really is. These 55 guides show what common measurements look like next to everyday objects — coins, phones, doors, cars and sports fields — and give the exact conversion for each one. Every figure uses the international standard 1 inch = 2.54 cm and 1 foot = 0.3048 m.
Pick a section below, or jump straight to a converter: inches to cm, inches to feet, feet to meters, mm to inches or the weight converter.
Inches: What Does It Look Like?
Small to medium lengths in inches, each compared with everyday objects you already know, plus the exact centimetre value.
- How Long Is 1 Inch? — 2.54 cm
- How Long Is 2 Inches? — 5.08 cm
- How Long Is 3 Inches? — 7.62 cm
- How Long Is 4 Inches? — 10.16 cm
- How Long Is 5 Inches? — 12.7 cm
- How Long Is 6 Inches? — 15.24 cm
- How Long Is 7 Inches? — 17.78 cm
- How Long Is 8 Inches? — 20.32 cm
- How Long Is 9 Inches? — 22.86 cm
- How Large Is 10 Inches? — 25.4 cm
- How Long Is 11 Inches? — 27.94 cm
- How Long Is 12 Inches? — 30.48 cm (1 foot)
- How Many Inches Are in a Foot? — 12 inches
- How Long Is 14 Inches? — 35.56 cm
- How Long Is 15 Inches? — 38.1 cm
- How Long Is 16 Inches? — 40.64 cm
- How Long Is 18 Inches? — 45.72 cm
- How Big Is 22 Inches? — 55.88 cm
- How Big Is 30 Inches? — 76.2 cm (2.5 ft)
- How Tall Is 40 Inches? — 101.6 cm
- How Many Feet Is 40 Inches? — 3 ft 4 in
Feet and Meters: Longer Distances
Room-sized to field-sized lengths. Each guide converts to meters and shows familiar things that span the same distance.
- How Long Is 2 Feet? — 24 in / 0.61 m
- How Long Is 10 Feet? — 120 in / 3.05 m
- How Long Is 15 Feet? — 4.57 m
- How Many Inches Is 15 Feet? — 180 in
- How Long Is 5 Meters? — 16.4 ft
- How Long Is 20 Feet? — 6.1 m
- How Long Is 25 Feet? — 7.62 m
- How Long Is 10 Meters? — 32.8 ft
- How Long Is 40 Feet? — 12.19 m
- How Long Is 50 Feet? — 15.24 m
- How Long Is 100 Feet? — 30.48 m
- How Long Is 200 Feet? — 60.96 m
- How Long Is 300 Feet? — 91.44 m
- How Long Is 500 Feet? — 152.4 m
Millimeters and Centimeters
Tiny metric sizes are hard to picture. These guides translate them into inches and match them to coins, seeds and other small items.
- How Big Is 2 mm? — 0.08 in
- How Big Is 3 mm? — 0.12 in
- How Big Is 7 mm? — 0.28 in
- How Big Is 2 cm? — 0.79 in
- How Long Is 3 cm? — 1.18 in
- How Big Is 7 cm? — 2.76 in
- How Big Is 30 cm? — 11.81 in
Heights
Height guides in feet, inches and centimeters, including average adult heights.
- What Does 5 Feet Tall Look Like? — 152.4 cm
- How Tall Is 6 Feet? — 182.9 cm
Bed and Mattress Sizes
Standard US mattress dimensions with metric equivalents and room-size advice.
- Full Bed Size Dimensions — 54 × 75 in
Phones and Cans
Exact product dimensions converted between millimeters and inches.
- iPhone 12 Size — 146.7 × 71.5 mm
- iPhone 14 Pro Max Size — 160.7 × 77.6 mm
- Red Bull Can Sizes — 8.4 oz can: 5.3 × 2.1 in
- Monster Can Size — 16 oz can: 6.2 × 2.6 in
Weight
What common weights feel like, with conversions between grams, kilograms, ounces and pounds.
- How Much Is 10 Grams? — 0.35 oz
- How Heavy Is 10 kg? — 22.05 lb
- What Weighs 50 Pounds? — 22.68 kg
More Ways to Compare Sizes
See side-by-side size comparisons, or open the full list of converters and calculators.