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Height Calculator
Convert height between feet/inches and cm/m.
How to use
- ā¢Enter height in feet/inches or centimeters.
- ā¢Click Calculate to convert.
- ā¢Copy the result or download JSON.
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Conversion Calculator
Convert common units (length, mass, temperature).
How to use
- ā¢Pick a category (length/mass/temperature).
- ā¢Select from-unit and to-unit.
- ā¢Enter a value and convert.
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Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with quick answers, formulas, and interpretation.
How to use
- ā¢Enter a value and pick from/to units (Ā°C/Ā°F/K).
- ā¢Convert and copy the result or share a link.
- ā¢Use Interpret/Learn/Explore to understand and continue.
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GDP Calculator
Calculate GDP per capita and growth rate.
How to use
- ā¢Enter GDP and population for per-capita GDP.
- ā¢Optionally add previous GDP for growth rate.
- ā¢Copy the result or download JSON.
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Density Calculator
Calculate density, mass, or volume.
How to use
- ā¢Choose what you want to calculate.
- ā¢Enter the other two values and units.
- ā¢Calculate and export the result if needed.
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Mass Calculator
Convert mass and estimate mass from density & volume.
How to use
- ā¢Use Convert mode for unit conversions.
- ā¢Use Estimate mode with density + volume.
- ā¢Copy or download JSON results.
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Weight Calculator
Convert weight and estimate weight from mass.
How to use
- ā¢Convert between N/kN/lbf/kgf.
- ā¢Or estimate weight from mass and gravity.
- ā¢Copy or export results.
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Speed Calculator
Convert speed and estimate travel time.
How to use
- ā¢Enter speed and select units.
- ā¢Convert to your target unit.
- ā¢Optionally add distance to estimate travel time.
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Molarity Calculator
Calculate molarity from moles and volume.
How to use
- ā¢Enter moles and solution volume.
- ā¢Optionally enter grams + molecular weight.
- ā¢Calculate molarity (mol/L).
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Molecular Weight Calculator
Compute molecular weight from chemical formula.
How to use
- ā¢Enter a chemical formula (e.g., H2O, NaCl).
- ā¢Calculate molecular weight (g/mol).
- ā¢Copy or download JSON.
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Roman Numeral Converter
Convert between Roman numerals and integers.
How to use
- ā¢Enter a number (1ā3999) or a Roman numeral.
- ā¢Convert both ways.
- ā¢Copy or download JSON.
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Voltage Drop Calculator
Estimate voltage drop and percent drop for a wire run.
How to use
- ā¢Enter supply voltage, current, and one-way length.
- ā¢Enter conductor resistance per length and select units.
- ā¢Calculate voltage drop and percent drop.
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Resistor Calculator
Decode 4-band/5-band resistor color codes.
How to use
- ā¢Choose 4-band or 5-band mode.
- ā¢Select the color bands.
- ā¢Calculate resistance and tolerance.
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Ohm's Law Calculator
Solve voltage, current, resistance, and power.
How to use
- ā¢Enter any two of V, I, and R.
- ā¢Calculate the missing value.
- ā¢Review power (W) and export results.
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Electricity Calculator
Estimate energy use (kWh) and cost.
How to use
- ā¢Enter power (W), hours/day, and days.
- ā¢Enter electricity rate per kWh.
- ā¢Calculate kWh and cost.
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Wind Chill Calculator
Calculate wind chill (feels-like cold) from temperature and wind speed.
How to use
- ā¢Enter air temperature and choose Ā°C or Ā°F.
- ā¢Enter wind speed and choose km/h or mph.
- ā¢Calculate wind chill and copy or download JSON.
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Heat Index Calculator
Calculate heat index (feels-like heat) from temperature and humidity.
How to use
- ā¢Enter air temperature and choose Ā°C or Ā°F.
- ā¢Enter relative humidity (%).
- ā¢Calculate heat index and export if needed.
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Dew Point Calculator
Calculate dew point from temperature and relative humidity.
How to use
- ā¢Enter air temperature and choose Ā°C or Ā°F.
- ā¢Enter relative humidity (%).
- ā¢Calculate dew point and copy or download JSON.
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Fuel Cost Calculator
Estimate fuel used and trip fuel cost.
How to use
- ā¢Enter distance and choose km or miles.
- ā¢Choose an efficiency mode (L/100km, mpg, or km/L) and enter the value.
- ā¢Enter fuel price (per liter or per gallon) to calculate cost.
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Gas Mileage Calculator
Calculate mpg, km/L, and L/100km from distance and fuel used.
How to use
- ā¢Enter distance and choose km or miles.
- ā¢Enter fuel used and choose liters or gallons.
- ā¢Calculate fuel economy metrics and export if needed.
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Horsepower Calculator
Convert torque and RPM into horsepower (hp) and kW.
How to use
- ā¢Enter torque and choose NĀ·m or lb-ft.
- ā¢Enter RPM.
- ā¢Calculate hp and kW and copy results.
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Engine Horsepower Calculator
Estimate horsepower from quarter-mile trap speed or ET.
How to use
- ā¢Select method (Trap Speed or ET).
- ā¢Enter vehicle weight and trap speed (or ET).
- ā¢Calculate estimated horsepower and kW.
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Mileage Calculator
Compute mileage from odometer readings and optional reimbursement.
How to use
- ā¢Enter start and end odometer readings.
- ā¢Choose miles or kilometers.
- ā¢Optionally enter a reimbursement rate to estimate total.
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Tire Size Calculator
Calculate tire diameter/circumference and compare tire sizes.
How to use
- ā¢Enter a tire size like 225/45R17.
- ā¢Optionally enter another size to compare.
- ā¢Calculate diameter, circumference, and percent differences.
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