Inches to Centimetres Calculator
Convert inches to centimetres (in to cm) and centimetres to inches (cm to in) with this accurate bidirectional converter. One inch equals exactly 2.54 centimetres — this is a defined exact value, not an approximation. Includes height conversion with feet and inches input, TV screen size guide, clothing measurements, and a full conversion table.
Inches ↔ Centimetres Converter
Height Converter: Feet & Inches ↔ cm
Conversion Formula
cm to inches: inches = cm ÷ 2.54
feet & inches to cm: cm = (feet × 30.48) + (inches × 2.54)
cm to feet & inches: total_inches = cm ÷ 2.54; feet = floor(total_inches / 12); inches = total_inches mod 12
Key Reference Values
1 cm = 0.3937 inches • 10 cm = 3.937 inches • 100 cm = 39.37 inches = 3 ft 3.37 in
Common Inches to cm Conversions
| Inches | Centimetres | Notes |
|---|---|---|
| 1 inch | 2.540 cm | |
| 2 inches | 5.080 cm | |
| 3 inches | 7.620 cm | |
| 4 inches | 10.160 cm | |
| 5 inches | 12.700 cm | |
| 6 inches | 15.240 cm | Half foot |
| 8 inches | 20.320 cm | |
| 10 inches | 25.400 cm | |
| 12 inches | 30.480 cm | 1 foot |
| 18 inches | 45.720 cm | |
| 24 inches | 60.960 cm | 2 feet |
| 30 inches | 76.200 cm | |
| 36 inches | 91.440 cm | 1 yard |
| 40 inches | 101.600 cm | Large TV boundary |
| 43 inches | 109.220 cm | Popular TV size |
| 50 inches | 127.000 cm | Popular TV size |
| 55 inches | 139.700 cm | Popular TV size |
| 65 inches | 165.100 cm | Large TV |
| 75 inches | 190.500 cm | XL TV |
Height Conversion Chart
| Height (ft & in) | Total Inches | Centimetres |
|---|---|---|
| 4 ft 0 in | 48 in | 121.92 cm |
| 4 ft 6 in | 54 in | 137.16 cm |
| 5 ft 0 in | 60 in | 152.40 cm |
| 5 ft 2 in | 62 in | 157.48 cm |
| 5 ft 4 in | 64 in | 162.56 cm |
| 5 ft 5 in | 65 in | 165.10 cm |
| 5 ft 6 in | 66 in | 167.64 cm |
| 5 ft 7 in | 67 in | 170.18 cm |
| 5 ft 8 in | 68 in | 172.72 cm |
| 5 ft 9 in | 69 in | 175.26 cm |
| 5 ft 10 in | 70 in | 177.80 cm |
| 5 ft 11 in | 71 in | 180.34 cm |
| 6 ft 0 in | 72 in | 182.88 cm |
| 6 ft 1 in | 73 in | 185.42 cm |
| 6 ft 2 in | 74 in | 187.96 cm |
| 6 ft 4 in | 76 in | 193.04 cm |
| 6 ft 6 in | 78 in | 198.12 cm |
| 7 ft 0 in | 84 in | 213.36 cm |
TV Screen Size Guide (inches to cm)
TV screen sizes in the UK are advertised in inches (measured diagonally), but European electrical standards often use cm. Here are popular TV sizes:
| Screen Size (inches) | cm (diagonal) | Approx. width (cm) | Room recommendation |
|---|---|---|---|
| 32 inches | 81.3 cm | 71 cm | Small bedroom |
| 40 inches | 101.6 cm | 89 cm | Bedroom / small lounge |
| 43 inches | 109.2 cm | 95 cm | Medium lounge |
| 50 inches | 127.0 cm | 110 cm | Medium lounge |
| 55 inches | 139.7 cm | 121 cm | Living room |
| 65 inches | 165.1 cm | 143 cm | Large living room |
| 75 inches | 190.5 cm | 166 cm | Large/cinema room |
| 85 inches | 215.9 cm | 188 cm | Cinema / large space |
UK Clothing Size Guide (inches to cm)
| Measurement | UK Size | Inches | cm |
|---|---|---|---|
| Women's chest | Size 8 | 31.5 in | 80 cm |
| Women's chest | Size 10 | 34 in | 86.4 cm |
| Women's chest | Size 12 | 36 in | 91.4 cm |
| Women's chest | Size 14 | 38 in | 96.5 cm |
| Women's chest | Size 16 | 40 in | 101.6 cm |
| Men's chest | S (36) | 36 in | 91.4 cm |
| Men's chest | M (38-40) | 38-40 in | 96.5-101.6 cm |
| Men's chest | L (42-44) | 42-44 in | 106.7-111.8 cm |
| Men's waist | 30W | 30 in | 76.2 cm |
| Men's waist | 32W | 32 in | 81.3 cm |
| Men's waist | 34W | 34 in | 86.4 cm |
Tyre Width Conversion (mm to inches)
UK car tyre widths are specified in millimetres (e.g., 205/55 R16), but knowing the inch equivalent is helpful for understanding tyre sizing. Common tyre widths:
| mm | inches | Common tyre sizes |
|---|---|---|
| 155 mm | 6.10 in | Small city cars |
| 175 mm | 6.89 in | Superminis |
| 195 mm | 7.68 in | Family hatchbacks |
| 205 mm | 8.07 in | Most common UK size |
| 225 mm | 8.86 in | Saloons, estate cars |
| 245 mm | 9.65 in | SUVs, 4x4s |
Worked Examples
Example 1: Converting 5 feet 10 inches to cm
Example 2: Converting a 55-inch TV diagonal to cm
Width (assuming 16:9 ratio) = 139.7 × (16/√(16²+9²)) = 139.7 × 0.8717 = 121.8 cm
Example 3: Converting 170 cm to feet and inches
Feet = floor(66.929 / 12) = 5 feet
Remaining inches = 66.929 - (5 × 12) = 6.929 inches ≈ 6 ⅞ inches
Result: 5 feet 6.9 inches
How to Convert Inches to Centimetres
This converter provides instant, accurate results for your measurement conversions. The UK uses a mix of metric and imperial measurements in daily life, which can make conversions a frequent necessity. Road signs use miles, food is sold in grams and kilograms, and height is often quoted in feet and inches despite the metric system being the official standard.
Understanding the conversion formula helps verify results and perform quick mental calculations when a tool is not available.
Key Information
Common UK conversion factors: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 mile = 1.609 km, 1 pound (lb) = 0.4536 kg, 1 stone = 6.35 kg, 1 pint (UK) = 568 ml, 1 gallon (UK) = 4.546 litres, 1 acre = 0.4047 hectares. Temperature conversions use the formula: Celsius = (Fahrenheit - 32) x 5/9.
Example Calculation
To convert 5 feet 10 inches to centimetres: first convert to total inches (5 x 12 + 10 = 70 inches), then multiply by 2.54 to get 177.8 cm. For weight, a person weighing 12 stone 7 lbs is 12.5 stone, which equals 79.4 kg (12.5 x 6.35).
Source: Based on international measurement standards. Last updated March 2026.
Frequently Asked Questions
How many centimetres are in 1 inch?
1 inch equals exactly 2.54 centimetres. This is an exact, defined value established by international agreement in 1959 (the International Yard and Pound Agreement). There is no rounding involved: 1 in = 2.54 cm precisely. To convert any inches to cm, multiply by 2.54.
What is 6 inches in cm?
6 inches equals 15.24 cm. Calculation: 6 × 2.54 = 15.24 cm. This is a very common measurement in DIY, crafting, and cooking (a standard 6-inch cake tin is 15.24 cm across).
How tall is 5 feet 10 inches in centimetres?
5 feet 10 inches equals 177.8 cm. Calculation: (5 × 30.48) + (10 × 2.54) = 152.4 + 25.4 = 177.8 cm. This is approximately the average height of a British adult male, making it one of the most searched height conversions in the UK.
What size is a 55-inch TV in centimetres?
A 55-inch TV has a diagonal screen size of 139.7 cm. Note: TV sizes are always measured diagonally (corner to corner). The actual width of a 55-inch widescreen (16:9) TV is approximately 121-122 cm, and the height is approximately 68-69 cm.
How do I convert cm to inches?
To convert centimetres to inches, divide by 2.54. For example, 100 cm ÷ 2.54 = 39.37 inches. Common conversions: 30 cm = 11.81 inches, 50 cm = 19.69 inches, 150 cm = 59.06 inches, 180 cm = 70.87 inches (5 ft 10.87 in).
What is my ring size in mm and UK size?
UK ring sizes use letters: Size L = 15.7 mm diameter (49.3 mm circumference), Size N = 16.5 mm (51.9 mm), Size P = 17.3 mm (54.4 mm), Size R = 18.1 mm (56.9 mm), Size T = 18.9 mm (59.5 mm). To find your size, measure your finger circumference in mm and compare to a ring size chart.
How wide are standard UK wallpaper rolls in centimetres?
Standard UK wallpaper rolls are 52 cm wide (approximately 20.5 inches) and 10 metres long. Some premium wallpapers are 68 cm (about 27 inches) or 90 cm (35.4 inches) wide. Lining paper is typically 56 cm (22 inches) wide. To calculate how many rolls you need, measure wall width and divide by 52 cm, then multiply by the number of drops needed.