How much does it cost to convert a MGB to electric?
About $37,500 to $66,200 all-in at a professional shop for roughly 200 miles of range (2026 prices, US labour rates). A well-known conversion with proven parts.
Cost by range
| Range | Battery | All-in estimate |
| 100 miles | about 28 kWh | $30,600 – $56,800 |
| 200 miles | about 56 kWh | $37,500 – $66,200 |
| 300 miles | about 84 kWh | $44,500 – $75,500 |
For a 1974 MG MGB that runs and has a solid body, at a US shop. Not a quote: real shops bid on Swaxcar, and the bidding finds the real price.
Where the money goes (200 miles)
| Battery, about 56 kWh for ~200 milesA light car gets about 4 miles per kWh. Priced on 2026 conversion-ready modules. | $12,900 – $17,400 |
| Battery boxes, battery management and high-voltage wiring | $1,500 – $3,000 |
| Motor, controller and mounts | $6,500 – $9,500 |
| Charger, DC-DC, heater, gauges, vacuum/steering pumps | $2,500 – $4,200 |
| Gearbox adapter or direct-drive setupDepends on whether the shop keeps your gearbox. | $1,200 – $3,500 |
| Labour, roughly 100–165 hoursA well-known car for conversions. | $10,000 – $23,100 |
| State inspection and registration paperwork | $200 – $600 |
| Contingency for surprises (8%) | $2,800 – $4,900 |
| All-in estimate | $37,500 – $66,200 |
Kits and builders
Popular in the UK. It is light, simple and well documented.
Known kit makers and builders for this car: RBW, Electric Classic Cars. Many local shops on Swaxcar install these kits or build their own.
Questions owners ask
How much does it cost to convert a MGB to electric?
At a professional shop in the US, expect about $37,500 to $66,200 all-in for around 200 miles of range on a car that runs and has a solid body. A 100-mile build starts near $30,600; 300 miles can reach $75,500.
Is there a conversion kit for the MGB?
A well-known conversion with proven parts. Popular in the UK. It is light, simple and well documented. Known kit makers and builders include RBW, Electric Classic Cars.
What is the most expensive part?
The battery. For 200 miles a MGB needs about 56 kWh, which is roughly $12,900 to $17,400 in 2026. Labour is usually second.
What makes the price go up?
Rust and a car that doesn't run. With some rust and a non-running car, the same 200-mile build is closer to $41,300–$80,200. Keeping the manual gearbox adds an adapter; modern cars need extra work on their electronics.
How do I get a real price?
List the car free on Swaxcar. EV conversion shops bid against each other on price, timeline and shipping for 7 days, and you pick the winner. You are never obliged to accept a bid.
Get real bids for your MGB
Paste your VIN, answer three quick questions, and get a free estimate for your exact car. Then shops compete for the job.
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