Automotive Engine & Chassis Calculators
Verify road speed gear ratios, decode metric tire specifications, calculate engine swept displacement volumes, find mechanical compression boundaries, size fuel injectors, convert suspension coil constants, and check alignment deflections.
Tire Size Decoder
Decode metric tire specs (e.g., 205/55R16) to calculate sidewall height, total diameter, circumference, and compare speedometer error against a secondary size.
Primary Tire Specifications
Explore Additional Utilities
Chlorophyll concentration ↔ water color index
Convert Chlorophyll-a bio-concentrations (mg/m³) to ocean water color classes, Forel-Ule index, and trophic status.
Cooling load — room size ↔ BTU ↔ tons of refrigeration
Calculate room-by-room air conditioner cooling load requirements in BTU, tons, and kilowatts based on area, insulation, and occupants.
Block count — wall area ↔ number of blocks needed
Calculate standard concrete masonry units (CMU) or clay bricks required for a wall, adjusting for joint widths and waste factors.
Net metering — units exported ↔ bill credit estimate
Estimate utility bill credits, net energy offsets, and financial yields under 1:1 net metering or dual-rate net billing programs.
Subtitle Timing & Readability
Evaluate subtitle card readability by computing characters per second (CPS), words per minute (WPM), and duration constraints.
Supersonic Mach Speed
Assess sonic speed boundaries and atmospheric Mach velocities relative to local dry conditions.
Chart Scale Converter
Convert map dimensions in millimeters to real-world marine navigation distances or vice versa based on nautical chart scale.
Original gravity ↔ potential ABV — beer brewing
Calculate alcohol by volume (ABV), attenuation percentages, and calorie estimations from Original and Final Gravity values.
Mortar mix ratio — cement ↔ sand ↔ water by weight
Calculate standard masonry mortar mix classes (Type M, S, N, O, K) and determine precise cement, sand, and water weights.
US Inflation Adjuster
Evaluate historical purchasing power changes in the United States using official CPI records.
Ballistic coefficient ↔ drag — projectile performance
Calculate bullet Sectional Density (SD) and Ballistic Coefficient (BC) using projectile weight, caliber, and form factor.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Color Code Converter
Instantly convert between HEX, RGB, HSL, and CMYK color spaces with a visual real-time preview and slider inputs.
Drill bit size — inches ↔ mm ↔ gauge number
Convert drill bit diameters between fractional/decimal inches, millimeters, and drill gauge number sizes.
Inverter sizing — load watts ↔ VA rating needed
Analyze total AC continuous and surge loads to specify the ideal inverter Volt-Amp (VA) and wattage ratings.
Glaze specific gravity ↔ pint weight — glaze consistency
Convert glaze liquid specific gravities to US/Imperial pint weights and calculate suspended dry material volumes.
Tree diameter ↔ basal area — forestry measurement
Convert tree breast height diameters to single tree basal area or estimate stand basal area densities per acre or hectare.
Julian ↔ Gregorian Calendar
Convert between Julian Dates (JD, MJD) and standard Gregorian calendar dates with day of the year and century metrics.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Semaphore flag positions ↔ letters
Map letters to naval Semaphore flag clock angles and visualize the exact left/right arm positions interactively.