Science hub
Energy, pressure, scientific units and lab tools.
About science conversions
Science converters span energy (joules, calories, eV, kWh), thermodynamic and lab quantities. Built for students, researchers and educators who need exact SI-grounded conversion without the rounding errors common in textbook tables.
All science tools
Every converter and calculator in this hub, ready to launch.
Popular science conversions
The most-searched conversion pairs — one tap straight to the answer.
When you'll reach for these
Practical scenarios where this hub shines.
Lab work
Convert calorimeter readings between calories and joules accurately.
Physics homework
Switch between eV, J and kWh in a single workflow.
Reading papers
Translate units from older literature into modern SI.
Key formulas
- Joules ↔ calories
1 cal = 4.184 J - Kelvin ↔ Celsius
K = °C + 273.15
Common mistakes
Calories vs kilocalories
1 dietary Calorie = 1000 thermochemical calories — always check the case.
Did you know?
1 eV is tiny
An electron-volt is ~1.602 × 10⁻¹⁹ joules — particle physics deals in extremely small energies.
Frequently asked
How many joules in one calorie?
1 thermochemical calorie equals exactly 4.184 joules. 1 kilocalorie (food calorie) equals 4,184 J.
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