eCalc - electric drive simulation and calculation

reliable electric drive simulations

Still guessing...?    get the right drive   -   no more mispurchase and safes your money

«The cost for eCalc is even lower then a mispurchase of a propeller only, let alone from a wrong motor, esc or battery...» more testimonials...

 more than 415'282'092 setups calculated and simulated so far.

For renewal or extension of your existing membership follow this link...
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VAT: reverse charge procedure applies.

membership for 12 month
1 month
eCalc RC Bundle
(incl. fanCalc, cgCalc,
propCalc, setupFinder,
xcopterCalc, heliCalc,
perfCalc, w&bCalc
$17.95 only iso $18.95


propCalc & setupFinderfor Airplane $9.99


xcopterCalcfor multicopters $9.99


for Helicopters
$6.99 iso $7.49

$0.99 iso $4.49

for Ducted Fans
$6.99 statt $7.49

$3.49  iso $4.99

Center of Gravity


Weight & Balance
free so far
free so far
free so far
free so far
for industrial applications
$18.95 iso $19.95

$6.49 iso $9.99

membership for 12 month 1 month
Remark: Prices are without VAT and the VAT reverse procedure applies. Exception B2C in EC: VAT will be added and eCalc will settle your local VAT.
eCalc - reliable RC Calculators since 2004
Buy a membership now, get instant access to the unrestricted version and enjoy the advantage of a membership:
  • fast, reliable, affordable and exceptionally useful
  • no more guess work and mispurchase - advanced simulation will avoid any mismatch of your next RC setup.
  • eCalc is the one and only calculator considering dynamic effect on a propeller with airfoil shapped blades
  • access to the full and most comprehensive component database with currently parts available.
  • enjoy the additional functiunality: simulate virtually any drive by entering the specs manually, Wizard for motor/prop selection, search for motors, export your results to any spreadsheet application, save and recall or share setups as bookmarks.
  • use the expert view for desktop computers or the easy view on your smartphone.
  • visit and sign-up our growing eCalc YouTube Channel for explanatory videos
  • Loyality bonus: get an additional discount for renewal of your membership
  • no installation required and have always the current version at hand
  • eCalc runs on all computer, tablets and smartphones having a state-of-the-art web browser installed, independent of the operating system (iOS, Win, Android, Unix,...)
  • free of Google advertisement on the side, top banner for direct marketing remains
Extend or renew existing Membership:
Get a special discount for renewal. An existing membership can be extended any time by any membership periode of the same membership type as long as the same email address is used for payment.
Terms and Conditions:
eCalc is subject to copyright and intellectual property rights.
Your membership is for personal use only. All values are calculated and may deviate from the real. Before flight you have to recheck the actual max. values. They must stay within the manufactuerers limitations.The functionality of eCalc may change without any notice. System outage or unforseen service discountinuation are not refundable. Use of the calculators is on your own risk - We reject any liablity.
Any misuse or extensive use will result in expiration of your membership without refund.
(For usage with commercial intent or commercial use please contact info[at]ecalc for a quote.)

Secured Payment & Purchase Protection:
Choose your membership. Prices are in US$ (w/o VAT). We accept secured payment by or Choose your membership plan below for immediate access and pay by:
[Buy Now] with PayPal: use your PayPal account or your Credit Card. The Payment service of PayPal will issue a receipt and benefit from PayPals extensive purchase protection
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[Pay with Card] with Stripe:  use your Credit Card for safe, fast and easy payment. The Payment service of Stripe will issue a receipt.
Manual invoices are issued for commercial licenses only! (Remark for eCheck and debit card: access will be granted after transfer of money. This may take 3-10 days).
Note: Your payment is fully handeled by PayPal or Stripe - we do not store any card details.

Payment by PayPal account: after clicking on «Buy Now» you will be redirected to PayPal. Choose «Pay with my PayPal account» and login to your PayPal accound. Follow the payment process... At the end follow the link «Return to info[at]» and your eCalc login details for immediate access will be dispayed.
Payment by Credit Card with PayPal: after clicking on «Buy Now» you will be redirected to PayPal. Choose «Create an Account» and pay easy and secure with your Credit Card. Follow the payment process... At the end follow the link «Return to info[at]» and your eCalc login details for immediate access will be dispayed.
Note: Your payment is fully handeled by PayPal - we do not store any card details. To decrease credit card fees PayPal did change there policy by Janary 1st 2017. A credit card payment is still possible but only by creating an account.
Some people hesitate do create a PayPal account - why? PayPal offers an extensive and sophisicated security for byers including purchase protection. Think about this: I personaly prefere to have my credit card details at a single place (PayPal) and pay online by PayPal instead of spreading my credit cartd details all over the different web shops.
Payment by Credit Card with Stripe: after clicking on «Pay with Card» a dialog will open requesting your card details. Follow the payment process for immediate access.
System Requirments:
eCalc is a Web Application and runs on computers, tablets and smartphones with a state-of-the-art web browser (Microsoft Edge, FireFox, Chrome, Safari and Opera) indepentent of the operating system (Win, iOS, Anreoid, Unix,...).
We refund your membership only in exeptional cases when requested within 3 days of your sign-up. Please email to info[at] with your username. If refund applies we refund your membership fee less payment fee of PayPal or card fee of Stripe.