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- Currency converter – manual rates, base currency.
Convert currencies with manual rates or a base‑currency cross.
- Length Converter (m, km, cm, mm, inch, foot, yard, mile).
Convert lengths across metric and imperial units at once with SI‑based factors, keyboard input, and a shareable.
- Temperature Converter (Celsius, Fahrenheit, Kelvin).
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with precise formulas, keyboard input.
- Unit Conversion Calculators: Length, Temperature.
Convert measurement units fast: unit converter, length, temperature, currency, and base conversion. Browser-only.
- Universal Unit Converter for Length, Area, Volume & More.
Convert length, area, volume, mass, speed and temperature units instantly.
Quick unit conversion reference
Common formulas and sample values for everyday conversions. For more units and precise results, use the converters below.
Currency rates change over time — calculate with the rate you need at the moment (see Currency converter).
Temperature (°C ↔ °F)
- Celsius → Fahrenheit: °F = °C × 9/5 + 32
- Fahrenheit → Celsius: °C = (°F − 32) × 5/9
| °C | °F |
|---|---|
| -40 | -40 |
| 0 | 32 |
| 20 | 68 |
| 37 | 98.6 |
| 100 | 212 |
Temperature is an “offset” unit (not just a multiplier), so use the proper formula or a converter (see Temperature Converter).
Length (cm / inch, m / ft)
- 1 inch = 2.54 cm (exact)
- 1 ft = 0.3048 m (exact)
| Value | Converted |
|---|---|
| 10 cm | ≈ 3.937 in |
| 1 m | ≈ 3.281 ft |
| 1 km | ≈ 0.6214 mi |
Choose rounding/precision based on your use case. If you need a full conversion table, use Universal Unit Converter and Length Converter.
Featured
Popular unit converters picked for quick access.
- Universal Unit Converter for Length, Area, Volume & More.
Convert length, area, volume, mass, speed and temperature units instantly.
- Temperature Converter (Celsius, Fahrenheit, Kelvin).
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with precise formulas, keyboard input.
- Length Converter (m, km, cm, mm, inch, foot, yard, mile).
Convert lengths across metric and imperial units at once with SI‑based factors, keyboard input, and a shareable.
A–Z Index
Jump alphabetically within unit converters.
Choose a converter by the quantity first
Use this hub when you know the thing you need to convert, but not the exact page yet. Pick the quantity or domain first, then open the matching converter.
Start with these conversion groups
- Physical units: length, area, volume, speed, and pressure.
- Temperature or science units: temperature, gas, and lab-style conversions.
- Currency and rates: use manual currency for fixed assumptions or FX for live reference rates.
- Kitchen and household quantities: open cooking or household-oriented converters when the task is not a pure SI/imperial swap.
Best workflow
- Choose the quantity family first.
- Open one converter and confirm the input/output units.
- Return here only if the next conversion belongs to a different family.
FAQ
When should I use this hub instead of a specific converter?
Use this hub when you know you need a conversion but have not decided whether it is length, temperature, currency, or another unit family yet.
What is the difference between currency and FX pages?
Use manual currency pages when you want fixed assumptions you control. Use live FX pages when the question depends on current reference rates.
Should I compare several converters at the same time?
No. Pick the one converter that matches the quantity first, then verify units before you compare any output with another page.
Are these pages enough for regulated or official values?
They are suitable for planning and educational checks. For compliance, trade, or regulated reporting, confirm units, rates, and official definitions separately.
Start with these conversion pages
- Unit conversion topic hubOpen this when you want the wider routing across converter families and adjacent topics.
- Length converterUse this for metric, imperial, and practical distance conversions.
- Temperature converterMove here for Celsius, Fahrenheit, and Kelvin checks.
- Live FX converterOpen this when the conversion depends on current reference rates rather than a fixed manual rate.