Conversions
Length, weight, area, volume, temperature, currency. Built for precision; we publish the formula on every page.
All conversions tools
34 tools, each runs locally in your browser. Click any card to open it.
AED Currency Converter computes converted amount at current FX rate from amount, source currency, target currency. Run…
A Audio to MP3 converts Audio into MP3 directly in your browser. It parses the source format, applies the standard map…
Celsius to Fahrenheit Converter takes source value and source unit and returns the matching celsius to fahrenheit resu…
Celsius ↔ Fahrenheit Converter takes source value and source unit and returns the matching celsius ↔ fahrenheit result…
roth conversion vs not, should i do a roth conversion, roth conversion calculator, traditional ira to roth, conversion…
Date and Time Converter is a free photo & video calculator that gives you a deterministic answer for date and time que…
Feet to Meters Converter computes length in the other unit from length value, source unit. Runs entirely in your brows…
Forex Currency Converter computes converted amount at current FX rate from amount, source currency, target currency. R…
Funnel Conversion Calculator takes source value and source unit and returns the matching funnel conversion result. Run…
Hex to CMYK Converter takes source value and source unit and returns the matching hex to cmyk result. Runs entirely in…
A Image to JPG converts Image into JPG directly in your browser. It parses the source format, applies the standard map…
A Image to PDF Converter converts Image into PDF directly in your browser. It parses the source format, applies the st…
A Image to PNG converts Image into PNG directly in your browser. It parses the source format, applies the standard map…
A Image to WebP converts Image into WebP directly in your browser. It parses the source format, applies the standard m…
A JPG to PDF converts JPG into PDF directly in your browser. It parses the source format, applies the standard mapping…
Kilograms ↔ Pounds Converter takes source value and source unit and returns the matching kilograms ↔ pounds result. Ru…
Lakh / Crore ↔ Million / Billion takes source value and source unit and returns the matching lakh / crore ↔ million / …
Miles ↔ Kilometers Converter takes source value and source unit and returns the matching miles ↔ kilometers result. Ru…
A MP3 to MP4 converts MP3 into MP4 directly in your browser. It parses the source format, applies the standard mapping…
A MP4 to MP3 converts MP4 into MP3 directly in your browser. It parses the source format, applies the standard mapping…
A PNG to WebP Converter converts PNG into WebP directly in your browser. It parses the source format, applies the stan…
Roth Conversion Calculator computes net after tax balance for each path from traditional IRA balance, marginal tax rat…
Roth Conversion Ladder computes net after tax balance for each path from traditional IRA balance, marginal tax rate, f…
Temperature Quick Converter takes source value and source unit and returns the matching temperature quick result. Runs…
Unit Converter takes source value and source unit and returns the matching unit result. Runs entirely in your browser.…
A Video to MP4 converts Video into MP4 directly in your browser. It parses the source format, applies the standard map…
A Word to PDF converts Word into PDF directly in your browser. It parses the source format, applies the standard mappi…
Yeast Conversion Calculator takes source value and source unit and returns the matching yeast conversion result. Runs …
AU to km, AU to light-years, astronomical unit, solar system distances, parsec astronomical unit (au) converter free 3…
celsius fahrenheit formula, temperature conversion, body temperature, room temperature precise celsius ↔ fahrenheit te…
kelvin celsius absolute zero, SI temperature, thermodynamics, gas laws kelvin ↔ celsius absolute temperature converter…
inches to cm, TV size, height conversion, US imperial vs metric precise inches ↔ centimeters converter free 3tej calcu…
kg to lb, body weight, stone UK, troy ounce, avoirdupois pound precise kilograms ↔ pounds converter free 3tej calculator
Convert between any two currencies using current FX rates. Useful for travel budgets, international invoicing, and cro…
About conversions
Unit conversion calculators cover the everyday and engineering conversions you need at the kitchen counter, the job site, and the office: length (inches/cm, feet/m, miles/km), weight (lb/kg, oz/g), volume (gal/L, fl oz/mL, cups/mL), area (sq ft/m², acres/hectares), temperature (F/C/K), pressure (psi/bar/kPa), energy (kWh/J/BTU), power (W/hp), speed (mph/kph), fuel economy (MPG / L/100km), and currency for 8 majors.
Use these tools to convert 350°F to gas mark for a UK recipe, 5 km to miles for a foreign race, 15 mpg to L/100km for a European spec sheet, 100 USD to EUR/GBP/INR for a travel budget, or 25 PSI to bar for a European bike tire pressure spec. Each tool shows the conversion factor and a quick mental check.
Sources: NIST SP 811 (US) and BIPM SI Brochure for unit definitions, ECB and central-bank rate feeds for currency. Currency is updated daily during market hours; static rates for weekends and holidays.
Common use cases
Real scenarios where the conversions calculators in this category earn their keep.
Oven temperature conversion
F to C: (F - 32) × 5/9. C to F: C × 9/5 + 32. Gas mark mapping included for UK and AU recipes.
Recipe volume from a cookbook
Convert US cups (236.6 mL) to UK cups (284 mL) or to grams for the specific ingredient (flour ~120g/cup, sugar ~200g/cup).
Travel distance in km vs miles
1 mile = 1.609 km. The distance tool converts and shows the round-trip total for trip planning.
Tire pressure PSI to bar
1 bar = 14.5 PSI. European bike specs in bar; US in PSI. The pressure tool converts cleanly.
Currency for a travel budget
100 USD to EUR / GBP / INR / JPY / AUD / CAD / CHF / CNY at today's rate (or pick a custom rate for a forward booking).
Key terms
Glossary for the formulas and conventions these tools use.
- Celsius to Fahrenheit
- F = C × 9/5 + 32. Inverse: C = (F - 32) × 5/9. Zero on each scale: 0°C = 32°F (water freezing), 100°C = 212°F (water boiling at 1 atm).
- MPG to L/100km
- L/100km = 235.215 / MPG (US). For UK MPG: L/100km = 282.481 / UK MPG. Lower L/100km = more efficient.
- PSI to bar
- 1 bar = 14.5038 PSI = 100 kPa = 0.987 atm. SI prefers kPa or MPa; tire pressures usually quoted in bar or PSI.
- kWh to BTU
- 1 kWh = 3,412 BTU. Energy unit conversion useful for HVAC sizing and electric heating.
- Acre to hectare
- 1 hectare = 2.471 acres = 10,000 m². Used for farmland and large-property pricing.
- Imperial vs US gallon
- 1 US gallon = 3.785 L; 1 imperial (UK) gallon = 4.546 L. A UK gallon is 20% bigger; matters for MPG comparison.
- Gas mark
- British oven scale. Gas mark 4 ≈ 180°C / 350°F. Each gas mark step is roughly 14°C / 25°F.
Frequently asked questions
Short answers to the most common conversions questions.