Roman Numeral Converter
Convert standard decimal numbers to classical Roman numerals (from 1 to 3999) and vice versa instantly.
Key Symbol Values
💡 Form Rules Reference
- Subtractive logic: Smaller symbols placed before larger symbols are subtracted (e.g., IV = 4, IX = 9, XC = 90).
- Sequential limits: A symbol cannot be repeated more than 3 times in consecutively formatted streams (e.g., 40 is XL, not XXXX).
Explore Additional Utilities
De Broglie wavelength — particle mass + velocity → wavelength
Calculate quantum mechanical wavelengths for matter waves under both classical and relativistic velocities.
Freefall time — altitude ↔ seconds in freefall
Estimate freefall duration and terminal velocity based on exit altitude, deployment altitude, and body position.
Lure weight ↔ bird size — training tool sizing
Determine the correct weight and aerodynamics of a training lure based on the bird’s species, sex, and weight.
Growing medium volume — container size ↔ liters needed
Determine the volume of clay pebbles, coco coir, perlite, or soil needed in liters based on net pot size or grow container dimensions.
Bait station density — infestation level ↔ stations per hectare
Calculate required rodent bait station density and grid spacing based on infestation severity and area dimensions.
Coordinate converter — WGS84 ↔ local datum
Convert geographic coordinates between global WGS84 (GPS) and local datums, including UTM zone coordinate conversions.
Exposure time — emulsion type ↔ UV source ↔ seconds
Estimate photo-emulsion exposure durations for screen printing frames or solar plates using light distance calculations.
Bearing ↔ azimuth ↔ compass direction — navigation angles
Convert between 360-degree azimuths, quadrant compass bearings (e.g., N45°E), and cardinal directions for mapping and surveying.
Pixel resolution — ground sample distance ↔ map scale
Calculate Ground Sample Distance (GSD), raster pixel resolutions, and minimum map scales for digital cartography and aerial imagery.
Chemical dilution — concentrate % ↔ water ↔ application rate
Calculate the required volume of liquid concentrate and water to achieve a specific target spray dilution percentage.
pH buffer amount — solution volume ↔ ml of pH up/down
Estimate the volume of phosphoric acid (pH Down) or potassium hydroxide (pH Up) needed to adjust nutrient water reservoirs.
Light intensity — PPFD ↔ lux ↔ watts per sq meter
Convert between Photosynthetic Photon Flux Density (PPFD/PAR), illuminance (Lux/Foot-candles), and grow light wattage requirements.
Tanning solution strength — hide weight ↔ chemical ratio
Calculate tanning agent concentrations, water ratios, and oil emulsions needed based on cured hide weight.
Jess length ↔ bird leg diameter — equipment fitting
Calculate required jess length, leash scale, and anklet widths based on raptor leg diameter or tarsus metrics.
Bird weight ↔ flying weight — hunting fitness assessment
Calculate fat depletion, flight weight targets, and fitness index from a raptor’s fat-free baseline and current hunting weight.
Form size — body measurement ↔ mannikin dimensions
Convert carcass or fresh animal field measurements (A, B, C, D) to standard taxidermy mannikin/form sizes.
Gray ↔ rad (Absorbed Dose)
Convert between Gray (Gy), rad, milligray (mGy), and microrad (µrad) to analyze absorbed ionizing radiation energy per unit mass.
Brick Count Estimator
Calculate bricks, mortar volume, sand, and cement needed for masonry walls.
Line length ↔ kite steering response — pivot arc
Analyze steering response lag and turning pivot arc diameter based on line length.
Canopy size — jumper weight ↔ wing loading
Calculate wing loading (lbs/sq ft) and find recommended parachute canopy sizes based on total jumper exit weight.