About the Sock Size Calculator
This tool converts a measured foot length into a US sock size using the traditional hosiery-industry numbering convention: sock size is simply your foot length in inches, rounded to the nearest half size. That single number is then bracketed into the range printed on most sock packaging — such as "9-11" or "10-13" — along with the roughly equivalent US shoe size.
The formula
Given a foot length measured heel to longest toe:
- US Sock Size = foot length in inches, rounded to the nearest 0.5. A 10-inch foot is sock size 10; a 10.7-inch foot rounds to sock size 10.5.
- Package range: manufacturers group sock sizes into labeled bands. Common US bands are roughly 9-11 for a smaller/women's foot, 10-13 for a mid-to-large or men's foot, and 13-15 for an extra-large foot. Because the same numeric size can appear in more than one band, this calculator uses your chosen sizing convention (men's, women's, or unisex) to pick the closest match.
- Equivalent US shoe size: using the common reference that a 26 cm foot is about US Men's shoe size 8 (each additional whole men's size is roughly 1 cm of foot length, and US women's sizing runs about 1.5 sizes higher than men's for the same foot length), so US Men's ≈ foot length (cm) − 18, and US Women's ≈ that value + 1.5.
How to measure your foot
Stand on a sheet of paper with your heel against a wall, mark the tip of your longest toe (not always the big toe), then measure the distance from the wall to that mark. Measure both feet — most people have one foot slightly longer — and use the longer one. Measure later in the day when feet are typically at their largest, since feet swell somewhat over the course of a day.
Why sock sizing looks different from shoe sizing
Shoe sizes use their own numbering scale that does not start at zero foot length, so a men's shoe size 8 does not mean an 8-inch foot — it is closer to a 10.2-inch foot. Sock sizing skips that translation and numbers directly by foot length, which is why a package might say "Sock Size 10-13" even though the shoes that fit the same feet are numbered 6 to 12.5.
Frequently Asked Questions
How is sock size calculated from foot length?
Why do men's and women's sock sizes differ for the same foot length?
How do I measure my foot for sock sizing?
Is sock size the same as shoe size?
Common Tip Percentages
| Service | Typical Tip Range | Notes |
|---|---|---|
| Restaurant (sit-down) | 15–20% | 20%+ for exceptional service |
| Food delivery | 10–20% | Consider extra for long distances |
| Taxi / rideshare | 10–20% | More for assistance with luggage |
| Hotel housekeeping | $2–5/night | Leave daily, not just at checkout |
| Barber / hair salon | 15–20% | On pre-discount total |
| Pizza delivery | 10–15% or $3–5 minimum | Higher in bad weather |
General Household Budget Ratios (50/30/20 Rule)
| Category | % of Net Income | Examples |
|---|---|---|
| Needs | 50% | Rent, groceries, utilities, insurance |
| Wants | 30% | Dining out, entertainment, hobbies |
| Savings / Debt | 20% | Emergency fund, retirement, extra payments |
Common Measurement Conversions for Everyday Use
| Quantity | US / Imperial | Metric Equivalent |
|---|---|---|
| 1 cup | 8 fl oz | 237 mL |
| 1 pint | 16 fl oz | 473 mL |
| 1 quart | 32 fl oz | 946 mL |
| 1 gallon | 128 fl oz | 3.785 L |
| 1 lb | 16 oz | 453.6 g |
| 1 ft | 12 in | 30.48 cm |