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Black and white table sticker titled KV × VOLTS = RPM, NO LOAD · FULL PACK · 4.20 V PER CELL, columns 4S 16.8 V and 6S 25.2 V, rows 1750 to 2750 KV (for example 1950 KV: 32 760 and 49 140 RPM), and a red footer PROPS ON: LOWER.

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KV × Volts = RPM Sticker

No-load RPM of common FPV motors on a full 4S and 6S pack.

€2.99per sticker · options from €2.99
Size: 75 mm

bank card100 mm75 mm
Shown to scale next to a bank card.

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  1. 5+−10%€2.69
  2. 10+−15%€2.54
  3. 25+−20%€2.39
  4. 50+−25%€2.24
  5. 100+−30%€2.09

  • €2 shipping in Europe · free over €15
  • Printed and dispatched in 1–7 business days from Valencia, Spain
  • 14-day returns. Print problem or lost in the post? Free reprint or refund. Details
  • Secure payment: card, Apple Pay, Google Pay, PayPal
  • Every value worked out from KV × cells × 4.20 V
  • 75 or 100 mm (longest side), so every number stays readable
  • Laminated against sun and moisture

Details

KV is how many RPM a motor turns per volt with nothing on it. Multiply by the pack voltage and you have its top speed: a 1950 KV motor on a full 6S pack (25.2 V) spins at 49 140 RPM without a prop. The table has the sums done for common 5” motor KVs on a full 4S and 6S LiPo.

With props on, the motor turns slower, and the voltage sags under load, so treat the table as a ceiling, not a reading. As a rough guide, 5” builds use about 1600 to 2100 KV on 6S and 2300 to 2800 KV on 4S.

Sold at 75 and 100 mm so every number stays readable. Stick it on your build case or your bench.

Check the quality of my sticker article here.

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