Calculators by country
The math is universal, but conventions are not: currencies, unit systems, tax habits and measurement traditions differ. Each hub explains what to watch for in that country.
United States
Currency: US Dollar (USD)
System: Imperial / US customary units
United Kingdom
Currency: Pound Sterling (GBP)
System: Metric with common imperial usage
Canada
Currency: Canadian Dollar (CAD)
System: Metric (official) with imperial in daily use
Australia
Currency: Australian Dollar (AUD)
System: Metric
India
Currency: Indian Rupee (INR)
System: Metric