Chart Scale Converter
Convert map dimensions in millimeters to real-world marine navigation distances or vice versa based on nautical chart scale.
A scale ratio of 1:25,000 indicates that 1 unit of measurement on this chart represents 25,000 of the same units in the real ocean environment. Large-scale charts (e.g. 1:10,000) show detail for harbors; small-scale charts (e.g. 1:300,000) cover large offshore transits.
Explore Additional Utilities
Certificate validity — days ↔ expiry date calculation
Convert between certificate lifetime in days, months, or years, and calculate exact UTC expiration times with leap year support.
Freefall time — altitude ↔ seconds in freefall
Estimate freefall duration and terminal velocity based on exit altitude, deployment altitude, and body position.
Specific heat capacity — J/kg·K ↔ BTU/lb·°F
Convert between specific heat capacity units including J/kg·K, kJ/kg·°C, BTU/lb·°F, and cal/g·°C.
Premium Rate ↔ Sum Insured
Calculate basic insurance premium rates, loading factors, and sum insured relationships (percentage, permille, and absolute values).
Tire size decoder — 205/55R16 ↔ diameter ↔ width ↔ aspect
Decode metric tire specs to calculate sidewall height, total diameter, circumference, and compare speedometer error against a secondary size.
Semaphore flag positions ↔ letters
Map letters to naval Semaphore flag clock angles and visualize the exact left/right arm positions interactively.
Explosive charge weight — rock volume ↔ kg of explosive
Estimate required explosives (kg, lbs) for blasting a rock volume using powder factor models for open-pit mining.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Electrode size ↔ amperage range — stick welding
Match stick electrode sizes (3/32", 1/8", 5/32") and classes (E7018, E6010, E6013) with optimal welding amperage ranges.
Render thickness ↔ coverage per bag
Determine dry render mix weight and bag counts for a target wall area and application thickness. Assess single bag yields.
Carnot efficiency — hot ↔ cold temperature → max efficiency
Calculate the maximum theoretical thermal efficiency (Carnot Limit) of heat engines based on reservoir temperatures.
Supersonic Mach Speed
Assess sonic speed boundaries and atmospheric Mach velocities relative to local dry conditions.
Morse code ↔ NATO phonetic — dual encoding
Convert raw text into international Morse Code (DITs and DAHs) and official NATO spelling phonetics synchronously.
Carton CBM ↔ Container Capacity
Convert carton dimensions to Cubic Meters (CBM) and calculate carton capacity for 20ft and 40ft shipping containers.
Fragrance concentration — EDC ↔ EDT ↔ EDP ↔ parfum %
Calculate fragrance oil and diluent volumes/weights for Eau de Cologne, Toilette, Parfum, and Extrait profiles.
pH adjustment — acid/alkali drops ↔ pH change estimate
Estimate acidifying or alkalizing solution amounts to safely adjust formulation pH values.
Industrial & Tire Pressure Gauges
Convert heavy industrial or automotive pressure indicators across PSI, bar, kPa, and atm indexes.
Ink coverage — % coverage ↔ grams per sq meter
Estimate wet/dry printing ink consumption and layer weight based on sheet area and CMYK channel coverage percentages.
Thermal conductivity — W/m·K ↔ BTU·in/hr·ft²·°F
Translate thermal conductivity values between W/m·K, BTU·in/hr·ft²·°F, and other units.
Stride length ↔ cadence ↔ running speed
Analyze running biomechanics: calculate speed based on cadence (SPM) and stride length.