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Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine

Temperature Conversion

Water freezes at 0°C
Water freezes at 32°F
Absolute zero at 0 K
Absolute zero at 0°R

Temperature Scale Visualization

Absolute Zero Very Hot
-273°C 0°C 100°C 1000°C

Conversion Formulas

Converting TO Celsius (°C)

From Fahrenheit: °C = (°F - 32) × 5/9
From Kelvin: °C = K - 273.15
From Rankine: °C = (°R - 491.67) × 5/9

Converting FROM Celsius (°C)

To Fahrenheit: °F = (°C × 9/5) + 32
To Kelvin: K = °C + 273.15
To Rankine: °R = (°C × 9/5) + 491.67

Direct Conversions

F to K: K = (°F - 32) × 5/9 + 273.15
K to F: °F = (K - 273.15) × 9/5 + 32
K to R: °R = K × 9/5
R to K: K = °R × 5/9

Current Calculation

Enter a temperature to see the calculation steps

Common Temperature References

Reference Point Celsius (°C) Fahrenheit (°F) Kelvin (K) Rankine (°R)

Temperature Calculator

Temperature Difference

Difference: -
In Fahrenheit: -

Temperature Scales

Celsius (°C): Based on water's freezing (0°) and boiling (100°) points at standard pressure
Fahrenheit (°F): Water freezes at 32° and boils at 212°. Commonly used in the United States
Kelvin (K): Absolute temperature scale starting from absolute zero (-273.15°C)
Rankine (°R): Absolute scale like Kelvin but using Fahrenheit-sized degrees

Features

  • ✅ Real-time conversion between all scales
  • ✅ Visual temperature scale indicator
  • ✅ Conversion formulas and calculations
  • ✅ Common temperature reference points
  • ✅ Temperature difference calculator
  • ✅ Quick preset temperatures
  • ✅ Copy and share functionality
  • ✅ Professional precision handling

Example algorithm (days)

// Using date objects in most languages:
days = (date2 - date1).days
Example: Days between 2025-01-01 and 2025-03-01 = 59 days (non-leap year).

6. Days Until

What it does: "Days Until" calculates how many days remain until a target date (a birthday, holiday, event). It is essentially a date-difference from today to a future date but often presented with friendly copy and optional recurrence handling for yearly events.

Features

Example: Today is 2025-09-24 — Days until 2025-12-25 (Christmas) = 92 days.

Putting it all together — Building reliable web calculators

Here are practical tips for developers and product managers building these tools on websites and mobile apps:

Sample HTML form (simplified)

<form id="percentage-form">
<label>Base: <input name="base" type="number" step="any" /></label>
<label>Percentage: <input name="percent" type="number" step="any" /></label>
<button type="submit">Calculate</button>
</form>

Attach client-side JS to compute results instantly and show them inside an accessible result container.

Design & SEO considerations

These calculator pages are highly searchable. Follow these quick SEO tips:

Conclusion

Age, Percentage, Loan, BMI, Date Difference, and Days Until calculators are simple but powerful tools that deliver immediate value. When implemented carefully — with correct formulas, clear UX, accessibility, and privacy considerations — they can significantly improve user engagement and trust. Developers should prefer reliable libraries for date and numeric handling, clearly document assumptions, and provide helpful explanations so users can understand and act on their results.

If you’d like, I can also provide ready-to-use JavaScript snippets for any of the calculators above (for example, a full amortization table script for the Loan Calculator or a BMI widget with unit toggles). Tell me which one you want first and I’ll include a copy-pasteable implementation.

Written as a detailed guide for developers and product teams building small utility calculators for web and mobile. Updated: 2025-09-24.