Calculator

Battery size and charge cost

Enter the battery's voltage and amp-hours from the listing, your electricity price and how many Wh your riding uses per mile. Every value can be changed.

In short

Wh = V x Ah. A full charge costs Wh ÷ 1,000 x your price per kWh, and range is Wh ÷ Wh per mile. Example: 36 V x 14 Ah = 504 Wh, which costs 12.6p at 25p per kWh and gives about 34 miles (54 km) at 15 Wh per mile.

Work it out

Battery voltage (V)Common: 36 V or 48 V.Battery capacity (Ah)Electricity price (pence per kWh)See your bill or tariff.Your use (Wh per mile)15 is a starting point. Hills, weight, cold and higher assist levels raise it.

Include charger losses (divide by 0.85)

Battery size: 504 Wh
Cost per full charge: 12.6p
Estimated range: 34 miles (54 km)

Wh = V x Ah. Cost in pence = Wh ÷ 1,000 x pence per kWh. Range in miles = Wh ÷ Wh per mile; km = miles x 1.609. Type decimals with a point, for example 14.5.

Common battery sizes

Battery size36 V x 14 Ah= 504 Wh
Range (54 km)504 Wh ÷ 15 Wh/mile≈ 34 miles
Cost per full charge504 ÷ 1,000 x 25p= 12.6p

Volts x amp-hours gives watt-hours; divide by your Wh per mile for range. Worked at 25p per kWh and 15 Wh per mile.

Battery	Wh	Range at 15 Wh per mile
36 V x 10 Ah	360 Wh	24 miles (39 km)
36 V x 14 Ah	504 Wh	34 miles (54 km)
48 V x 13 Ah	624 Wh	42 miles (67 km)
36 V x 20 Ah	720 Wh	48 miles (77 km)

Rounded. Real range depends on hills, rider and load weight, temperature and assist level.