Conversion Calculators 2026 - Fuel, Concentration, Currency
What makes the conversion category useful
This category groups calculators that solve closely related real-world tasks, so you can move from a quick estimate to a more specific planning tool without restarting the process.
Convert fuel efficiency between MPG (US), MPG (UK), L per 100 km, and km per litre
Switch chemistry concentration units between mol per litre, mg per mL, and percentage
Compute molar mass to grams for any compound formula and target mole quantity
Convert Russian rubles to US dollars using the latest exchange rate
See the conversion factor and worked formula beside every result
Driving and motoring
Compare fuel efficiency claims when shopping across imperial and metric markets.
Chemistry and lab work
Convert solution concentrations and prepare reagents from a target mole quantity.
International budgeting
Convert currency for travel, freelance invoices, and online purchases.
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How do I convert MPG to L per 100 km?
Divide 235.215 by the MPG figure (US gallon). 30 MPG equals 235.215 / 30, which is about 7.84 L per 100 km. UK gallons use 282.481 instead because a UK gallon is 4.546 litres.
How do I convert mol per litre to mg per mL?
Multiply mol per litre by the molar mass in grams per mole, then divide by 1,000. A 0.1 mol per litre solution of glucose (180 g per mole) equals 18 mg per mL.
How do I calculate moles to grams?
Multiply moles by the molar mass. 0.5 moles of NaCl (molar mass 58.44) equals 0.5 times 58.44, which is 29.22 grams.
How is the RUB to USD exchange rate set?
The Russian central bank publishes a daily reference rate. Banks and money changers add a spread of around 1 to 3 percent. Online converters track the mid-market rate, which is typically the same as the central bank rate within the trading day.
Why are imperial and US gallons different?
A UK (imperial) gallon is 4.546 litres while a US gallon is 3.785 litres. UK MPG figures are about 20 percent higher than US MPG for the same vehicle, which matters when comparing British and American spec sheets.
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