Science & technology calculators
Work with engineering formulas, scientific measurements and digital utilities.
Before you begin
- Keep units consistent across each formula.
- Reference conditions and idealized assumptions can affect the result.
- Use a qualified professional for safety-critical design.
Choose your calculator
Density Calculator
Density: Uniform bulk density using SI base units.
CalculatorMass Calculator
Mass: Uniform bulk density using SI base units.
CalculatorWeight Force Calculator
Weight Force: Distinguishes mass from force.
CalculatorSpeed Calculator
Speed: Average scalar speed; no acceleration is modeled.
CalculatorOhm's Law Calculator
Ohm's Law: Positive DC magnitudes for an ideal resistive load.
CalculatorResistor Calculator
Resistor: Ideal resistor values.
CalculatorVoltage Drop Calculator
Voltage Drop: Engineering estimate using uniform conductors.
CalculatorHorsepower Calculator
Horsepower: Mechanical work at constant effective force; horsepower definitions differ and are labeled..
CalculatorEngine Horsepower Estimate
Engine Horsepower Estimate: Empirical drag-racing estimate.
CalculatorMolarity Calculator
Molarity: Ideal concentration arithmetic.
CalculatorWind Chill Calculator
Wind Chill: Cold-weather model valid at or below 10°C with wind above 3 mph.
CalculatorHeat Index Calculator
Heat Index: Shade and light-wind heat index, not a complete heat-stress assessment.
CalculatorDew Point Calculator
Dew Point: Approximation over liquid water within the displayed temperature range; frost-point calculations use different coefficients..
CalculatorMolecular Weight Calculator
Molecular Weight: PubChem atomic-mass snapshot reviewed 2026-10-07, including representative mass numbers for unstable elements.
CalculatorIP Subnet Calculator
IP Subnet: IPv4 and IPv6 CIDR arithmetic.
CalculatorBase64 Encoder / Decoder
Base64 Encoder / Decoder: Text-only conversion runs on your device.
CalculatorURL Encoder / Decoder
URL Encoder / Decoder: This transforms text locally and does not visit the supplied URL.
CalculatorBandwidth Calculator
Bandwidth: Decimal SI units and binary IEC units are distinct.
Understand the calculation
Amperes to attoamperes converter
Convert amperes (A) to attoamperes (aA). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionAttoamperes to amperes converter
Convert attoamperes (aA) to amperes (A). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionAmperes to centiamperes converter
Convert amperes (A) to centiamperes (cA). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionCentiamperes to amperes converter
Convert centiamperes (cA) to amperes (A). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionAmperes to decaamperes converter
Convert amperes (A) to decaamperes (daA). Calculate any value, follow the unit-factor steps and check a conversion table.
conversionDecaamperes to amperes converter
Convert decaamperes (daA) to amperes (A). Calculate any value, follow the unit-factor steps and check a conversion table.