Everyday calculators
Calculators for everyday questions: what a trip costs in fuel, how to split a bill fairly, when to go to bed, what past prices are worth today, and zakat.
Fuel cost and MPGTrip fuel cost and miles per gallon, with US and UK gallons.Split the billShare a bill equally or by income, with tip and tax.Sleep calculatorBedtimes and wake-up times that fit whole sleep cycles.Inflation calculatorWhat a past price is worth today, using official US and UK price data.Zakat calculatorZakat due on cash, gold, silver and business stock, with the nisab worked out.
Which everyday calculator do I need?
- What a road trip costs in fuel, or your car's MPG: the fuel cost calculator, with US and UK gallons and liters.
- Sharing a bill with friends or housemates: split the bill equally or by income, with tip and tax.
- When to go to bed or wake up: the sleep calculator plans around sleep cycles.
- What a past price is worth today: the inflation calculator uses official US and UK price data.
- Working out zakat: the zakat calculator values cash, gold, silver and business stock against the nisab.
Figures you can trace
Where a calculator uses outside figures, such as price indexes or gallon sizes, the page names the official source and the period the figures cover, so you can check them. Guidance on sleep comes from public health bodies, and the zakat page cites established zakat organizations and notes where scholars differ.
Common questions
Does the fuel calculator know today's fuel price?
No. You enter the price you pay, so the result matches your own pump price.
Is any of this medical, financial or religious advice?
No. These are general calculators to help you plan. For health questions talk to a doctor, and for personal zakat questions ask a scholar.