Why use Convertly?
- 100% free, no signup. Open the page and use the tool — no account, no email, no paywall.
- Private by design. Everything runs in your browser. Your inputs never leave your device.
- Fast on any device. Lightweight pages that load instantly on mobile and desktop.
Guides & how-tos
Practical guides about unit converters — written to actually help, not to waste your time.
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Kilometers to Miles: The Simple Conversion Guide
The exact factor, a 5-second mental trick, and a quick reference table.
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Celsius to Fahrenheit: Formula and Quick Tricks
Both formulas, the double-plus-30 shortcut, and the reference points worth memorizing.
Frequently asked questions
Which units are supported?
Length: km, m, cm, mm, miles, yards, feet, inches. Weight: kg, g, lb, oz. Temperature: °C, °F, K.
How accurate are conversions?
Conversions use exact international definitions (e.g. 1 inch = 2.54 cm), so results are precise.
Can I convert cooking measurements?
This tool covers length, weight and temperature. For cups↔grams, note that it depends on the ingredient's density.