Type a number, watch the live thermo-dial move. Built for cooking, weather, science, and health — no signup, no ads blocking the tool.
Most converters give you a single number and stop there. Toolyfi's version keeps all three scales open at once and syncs them live, so you can see Celsius, Fahrenheit, and Kelvin moving together as you type — the thermo-dial and tube fill in real time to give you an instant visual sense of "how hot is that, really."
Whether you're checking an oven setting from a US recipe, reporting a fever in the unit your doctor expects, or converting lab data for a physics assignment, the goal is the same: get an accurate number in under two seconds without hunting through ads or pop-ups.
All three scales update instantly as you type — no "Convert" button needed.
Accurate to 0.01°, useful for lab work as well as everyday checks.
A live gauge and tube fill so you can gauge intensity at a glance.
Copy all three converted values together for notes, recipes, or reports.
100% free, runs in your browser, nothing is stored on our servers.
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | −273.15°C | −459.67°F | 0 K |
| Very Cold Day | −18°C | 0°F | 255.15 K |
| Freezing Point of Water | 0°C | 32°F | 273.15 K |
| Room Temperature | 21°C | 70°F | 294.15 K |
| Body Temperature | 37°C | 98.6°F | 310.15 K |
| Fever Threshold | 38°C | 100.4°F | 311.15 K |
| Hot Bath | 40°C | 104°F | 313.15 K |
| Water Boils | 100°C | 212°F | 373.15 K |
| Moderate Oven | 180°C | 356°F | 453.15 K |
| Hot Oven | 220°C | 428°F | 493.15 K |
Cooking with US recipes: Most American recipes list oven temperatures in Fahrenheit while the rest of the world bakes in Celsius. A quick check here prevents a burnt or undercooked dish. Pair it with our unit converter for cups-to-grams conversions in the same recipe.
Travel & weather: If you're checking a forecast from a US site while living in a Celsius country (or vice versa), converting the day's high and low takes the guesswork out of packing.
Health tracking: Thermometers sold in different countries use different scales. Converting a child's or your own reading against the fever threshold above helps you react appropriately without confusion.
Science & engineering: Kelvin is the SI base unit for thermodynamic calculations. Students and engineers often need to shift between lab notation (K) and everyday reporting (°C).
1. Pick any field. Click into Celsius, Fahrenheit, or Kelvin — it doesn't matter which.
2. Type your value. The other two fields, the dial, and the tube update instantly.
3. Copy or clear. Use "Copy Results" to grab all three values in one line, or "Clear" to start over.
Convert oven temps between US and metric recipes.
Physics and chemistry homework involving Kelvin conversions.
Reading a fever thermometer from another country's scale.
Understanding foreign weather reports at a glance.
Fast, precise unit shifts for experiments and reports.
Cross-checking spec sheets that mix unit systems.