Conversions
Conversions are useful only when both the starting and destination units are clear. This collection keeps unit conversions separate from clothing and equipment-size estimates. Physical conversion factors, numerical encodings and manufacturers’ sizing conventions are not interchangeable: a fixed length conversion can be exact, while a suggested clothing size depends on the particular chart and product. Check which kind of relationship a page is using before relying on its output.
Start with these tools
Currency Calculator
Convert an amount using an exchange rate you enter. No live API is required.
Acceleration Conversion Calculator
Convert acceleration between SI, imperial, Gal, and standard-gravity units.
Angle Conversion Calculator
Convert angles among degrees, radians, gradians, turns, arcminutes, and arcseconds.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions.
Belt Size Calculator
Calculate belt size from waist size.
Enter the complete value, select the correct units and check whether a dimension is a length, an area or a volume. Squaring or cubing a length conversion factor is essential when converting area or volume. Keep enough precision for intermediate work, then round to the needs of the final measurement. A useful check is to convert the answer back to the starting unit. Product-fit estimates still need confirmation against the actual maker’s chart. Saved examples let you repeat a conversion without retyping, but shared links expose their input values to recipients. Formula notes and related links help distinguish tools with similar names but different purposes.
units
Currency Calculator
Convert an amount using an exchange rate you enter. No live API is required.
Acceleration Conversion Calculator
Convert acceleration between SI, imperial, Gal, and standard-gravity units.
Angle Conversion Calculator
Convert angles among degrees, radians, gradians, turns, arcminutes, and arcseconds.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions.
Camera Lens Equivalent
Calculate 35mm equivalent focal length for different sensor sizes.
Celsius to Rankine Calculator
Convert temperatures from degrees Celsius to degrees Rankine.
Child Height Predictor
Estimate a child's adult height based on the mid-parental height method.
Computer Storage Units Conversion Calculator
Convert bits and bytes using decimal SI or binary IEC storage units.
Conversion Calculator
Convert between different units for length, weight, and temperature.
Cooking Conversion Calculator
Convert common cooking volume and weight units, including optional volume-to-weight conversion by density.
Cubic Feet to Cubic Yards Calculator
Convert cubic feet to cubic yards.
Cubic Yards to Cubic Feet Calculator
Convert cubic yards to cubic feet.
Decimal Degrees to Degrees Minutes Seconds Calculator
Convert a decimal angle or coordinate to degrees, minutes, and seconds.
Energy Conversion Calculator
Convert energy between joules, watt-hours, calories, BTU, foot-pounds, and electronvolts.
Fahrenheit to Rankine Calculator
Convert temperatures from degrees Fahrenheit to degrees Rankine.
Feet and Inches Calculator
Add, subtract, multiply, or divide measurements expressed in feet and inches.
Force Conversion Calculator
Convert force between newtons, pound-force, kilogram-force, dynes, and related units.
Golden Ratio
Calculate dimensions based on the mathematical beauty of the Golden Ratio (φ ≈ 1.618).
Kelvin to Rankine Calculator
Convert temperatures from kelvin to degrees Rankine.
Momentum Unit Converter
Convert linear momentum and impulse-equivalent units.
Percent to Decimal Calculator
Convert a percentage to decimal form.
Percent to Fraction Calculator
Convert a percentage to a simplified fraction and decimal.
Pixel Density
Calculate the PPI (Pixels Per Inch) and evaluate the sharpness of any display based on resolution and size.
Power Conversion Calculator
Convert power between watts, horsepower, BTU per hour, and foot-pounds per second.
Pressure Conversion Calculator
Convert pressure between pascals, bar, atmospheres, psi, torr, and millimeters of mercury.
Roman Numerals
Seamlessly convert between standard Arabic numerals and classical Roman numeral notations.
Speed Conversion Calculator
Convert speed between metric, imperial, nautical, and Mach units.
Square Feet to Square Meters Calculator
Convert area from square feet to square meters.
Square Meters to Square Feet Calculator
Convert area from square meters to square feet.
Troy Weight Conversion Calculator
Convert precious-metal weights between grains, pennyweights, troy ounces, troy pounds, grams, and kilograms.
Volume Conversion Calculator
Convert liquid and solid volume across metric, US customary, and cubic units.
clothing
Belt Size Calculator
Calculate belt size from waist size.
Bike Frame Size Calculator
Calculate bike frame size based on inseam.
Bra Size Calculator
Estimate bra size based on band and bust measurements.
Clothing Size Converter
Convert clothing sizes between international regions (Men's Tops).
Glove Size Calculator
Determine your standard glove size based on the circumference of your hand.
Hat Size Calculator
Calculate your standard US hat size from your head circumference.
Jacket Size Calculator
Find your standard jacket size based on your chest circumference measurement.
Paper Size Quick Reference
Find exact millimeter and inch dimensions for international standard paper formats.
Ring Size Finder
Convert physical ring diameter measurements into standard US Ring Sizes for accurate jewelry shopping.
Shoe Size Converter
Convert shoe sizes between US, UK, and EU standards.
Skateboard Size Calculator
Calculate recommended deck width based on your shoe size.
Ski Size Calculator
Calculate recommended ski length based on height and skill level.
Snowboard Size Calculator
Calculate target snowboard length based on your measurements.
Surfboard Volume Calculator
Calculate your ideal surfboard volume based on weight and experience level.
TV Size & Viewing Distance Calculator
Estimate a practical viewing-distance range from TV size and resolution.
Wetsuit Size Calculator
Get a recommended wetsuit size based on your height and weight.
Frequently asked questions
How do I choose a tool from Conversions?
Start with the quantity you need to solve for, then compare the required inputs and assumptions before entering values.
Are results in Conversions guaranteed?
No. Read the formula, limitations and reference information on the individual calculator. Entered example rates are not current offers or professional advice.
Can I save a calculation from Conversions?
The calculator pages support browser-local project and share controls. Shared links and exported files may contain your inputs.