Shoe Size Converter
Convert shoe sizes instantly across US, UK, European and Japanese (cm) sizing systems with comparison tables.
Full Quick Sizing Table (Men's)
| US Size | UK Size | EU Size | JP Size (cm) |
|---|---|---|---|
| 6 | 5.5 | 39 | 24.0 |
| 6.5 | 6 | 39.5 | 24.5 |
| 7 | 6.5 | 40 | 25.0 |
| 7.5 | 7 | 40.5 | 25.5 |
| 8 | 7.5 | 41 | 26.0 |
| 8.5 | 8 | 41.5 | 26.5 |
| 9 | 8.5 | 42 | 27.0 |
| 9.5 | 9 | 42.5 | 27.5 |
| 10 | 9.5 | 43 | 28.0 |
| 10.5 | 10 | 44 | 28.5 |
| 11 | 10.5 | 44.5 | 29.0 |
| 11.5 | 11 | 45 | 29.5 |
| 12 | 11.5 | 45.5 | 30.0 |
| 13 | 12.5 | 47 | 31.0 |
Explore Additional Utilities
Morse code ↔ NATO phonetic — dual encoding
Convert raw text into international Morse Code (DITs and DAHs) and official NATO spelling phonetics synchronously.
Solar irradiance — W/m² ↔ peak sun hours
Convert solar irradiance (W/m²) and daylight duration to Peak Sun Hours (PSH) and estimate daily solar panel system output.
Electron volts ↔ joules ↔ nanometers — photon energy
Convert between photon energy (eV, Joules) and physical wavelengths (nm, pm) or frequency (THz).
Steel grade equivalents — ASTM ↔ EN ↔ JIS standards
Cross-reference standard steel grades across ASTM/AISI, EN/DIN, and JIS systems. Includes chemical composition and key mechanical limits.
Rock density ↔ tonnage — volume to weight for blasting
Determine solid rock and broken loose rock tonnage from volume based on rock type densities, useful for blasting and haulage design.
Water hardness — ppm ↔ grains per gallon ↔ mg/L
Convert brewing water hardness profiles between ppm, mg/L, Grains per Gallon (gpg), and German degrees (dGH).
Preservative usage rate — product weight ↔ grams needed
Determine exact weight additions of cosmetic-grade preservatives in grams based on batch specifications.
Dye concentration — owf % ↔ grams per liter
Convert textile dyestuff concentration between on weight of fiber (% owf) and grams per liter (g/L).
Premium Rate ↔ Sum Insured
Calculate basic insurance premium rates, loading factors, and sum insured relationships (percentage, permille, and absolute values).
Duration Converter
Convert time intervals seamlessly between weeks, days, hours, minutes, and seconds.
Engine power ↔ hull speed — planing vs displacement
Estimate maximum displacement hull speeds (LWL formula) or calculate planing hull speeds using Crouch's classic marine formula.
Lye calculator — oil weight ↔ NaOH ↔ KOH amount
Determine exact NaOH and KOH weights required for cold and hot-process soap formulation batches.
Angular Motor Rotation
Determine crankshaft engine RPM, radian ratios, and angular physical velocities.
Drill bit size — inches ↔ mm ↔ gauge number
Convert drill bit diameters between fractional/decimal inches, millimeters, and drill gauge number sizes.
Network Bandwidth Rates
Compare network bandwidth speed rates across Mbps, Megabytes, and hourly rates.
Atomic mass units ↔ grams — mole calculations
Convert Atomic Mass Units (u / Da) to grams or kilograms, and compute molar quantities of chemical elements.
Supersonic Mach Speed
Assess sonic speed boundaries and atmospheric Mach velocities relative to local dry conditions.
Water cement ratio ↔ compressive strength
Estimate 28-day concrete compressive strength from the water-cement (W/C) ratio using Abrams' Law, or solve for desired strengths.
SHA & MD5 Hash Generator
Formulate SHA-1, SHA-256, and MD5 secure cryptographic checksum hashes in real-time right inside your sandbox.
Julian ↔ Gregorian Calendar
Convert between Julian Dates (JD, MJD) and standard Gregorian calendar dates with day of the year and century metrics.