How to convert length units
- Enter a number at the top.
- Tap a From unit (e.g. miles), then a To unit (e.g. kilometers)—or use Swap units.
- Try a common conversion chip (5 mi → km, 12 in → cm) and edit the amount if needed.
- Read the converted amount on the top right—it updates as you type or change units.
Handy references
1 mile ≈ 1.609344 km. 1 foot = 12 inches = 0.3048 m. 1 inch = 2.54 cm exactly. For height in feet/inches before BMI or body fat (cm), convert here first.
Example: 5 miles to km
5 × 1.609344 ≈ 8.05 km (road sign mental math often uses 1.6).
Road trips and sports
Marathon 42.195 km ↔ about 26.2 mi. A 10K run is 10 km ≈ 6.21 mi. Mental math often uses 1 mi ≈ 1.6 km—tap the 5 mi → km shortcut on the form to match.
Health calculators use cm
BMI and body fat pages expect centimeters. Convert feet/inches here, then pair with the weight converter if you only know pounds.
Construction and screens
Feet/inches ↔ meters for materials; inches ↔ cm for monitor specs (exact 2.54 cm/in).
How many kilometers is 5 miles?
About 8.05 km (5 × 1.609344). Enter 5, choose mi → km, or tap the 5 mi → km shortcut on this page. For other distances, change the number—each mile is 1.609344 km here.
How do you convert miles to kilometers?
Multiply miles by 1.609344. Example: 10 mi ≈ 16.09 km. On CalcTool: type the distance, tap miles under From and kilometers under To; the top-right result updates instantly.
How do you convert kilometers to miles?
Divide km by 1.609344 (or multiply by ~0.621371). Example: 10 km ≈ 6.21 mi. Use the 10 km → mi shortcut or pick km → mi yourself—the math runs locally in your browser.
What is 5 feet 7 inches in cm?
67 inches total × 2.54 = about 170.2 cm. Convert 5 ft to inches (60 in) plus 7 in = 67 in, then in → cm; or convert 5 ft and 7 in in two steps. Use that cm in the BMI calculator or body fat calculator if needed.
How many cm in an inch? (Inches to centimeters)
Exactly 2.54 cm per inch—that definition is exact, not rounded. Enter any inch value, From in, To cm (try the 12 in → cm shortcut for a foot of length).
How do you convert feet to meters?
1 ft = 0.3048 m. Six feet ≈ 1.83 m. Pick ft → m or use the 6 ft → m shortcut, then edit the amount for your room height or board length.
How do you convert meters to feet?
1 m ≈ 3.281 ft. A 2 m doorway ≈ 6.56 ft. Select m under From and ft under To, enter your meters, read feet on the right.
170 cm is how many feet and inches?
170 cm ÷ 2.54 ≈ 66.9 in ≈ 5 ft 7 in (5×12 + 7). Convert 170 cm → in to see total inches, then ÷ 12 for feet with remainder inches—or use cm → ft for approximate feet only.
When should I use mm, cm, m, or km?
mm for thin parts and tolerances; cm for body height and waist/neck tape reads; m for rooms and furniture; km or mi for driving and running distance. All four metric steps plus ft/in/mi are on this converter.
Does this convert yards or nautical miles?
No—only km, m, cm, mm, mi, ft, in. For yards, convert via feet (1 yd = 3 ft). Nautical miles need a marine-specific tool.
Half marathon / marathon distance in miles?
Half marathon is 21.0975 km ≈ 13.1 mi; full marathon 42.195 km ≈ 26.2 mi. Enter km, convert to mi—or the reverse for US race brochures listed in miles.
100 km/h speed limit—how many mph? (distance units only)
This page converts length, not speed. As a distance hint: 100 km ≈ 62.1 mi of road; for mph you need km/h conversion separately.
12 inches to cm (one foot)?
12 × 2.54 = 30.48 cm exactly. Use the 12 in → cm shortcut on the form.