Pricing
Every calculator on Encalc is free to use. A paid plan raises your daily calculation limit and unlocks crank-train dynamics, component stress, and the 1:1 cone templates for two-stroke pipes. If the templates are all you need, they are also sold on their own for a single payment.
Guest
$0/month
- 5 calculations per day
- Thermal cycle, exhaust and engine presets
- No account needed
No sign-up required — open a calculator and run it.
Free
$0/month
- 10 calculations per day
- Thermal cycle, exhaust and engine presets
- Cone template preview on the exhaust calculator
Create an account to double the daily limit.
Pro
$9/month
- 60 calculations per day
- Crank-train dynamics: gas, inertia and resultant forces, torque over the cycle
- Stress calculator: piston, rings, pin, connecting rod and crankshaft
- Cone template PDF and DXF downloads for two-stroke pipes
- CSV export of every calculated step
- Everything in Free
Enterprise
$19/month
- 1000 calculations per day
- Everything in Pro
- For teams running parameter sweeps rather than single designs
Only building a pipe? Cone template pack
1:1 PDF (A4 or Letter, tiled) and DXF flat patterns of every section of your expansion chamber, for every pipe you design in the exhaust calculator. One payment, no subscription. Included in Pro and Enterprise.
$9 once
What counts as a calculation
One press of a Run button is one calculation, whichever calculator you are in. Changing an input and running again counts as another. Loading a preset, reading the charts, zooming them or exporting the result you already have costs nothing. The counter resets every day.
What a paid plan actually adds
The free tier gives you the full thermodynamic cycle: pressure, temperature, mass and volume through every crank degree, mean effective pressure, power, torque and efficiency. For understanding how an engine breathes, that is the whole story, and it stays free.
Pro adds the step after that: taking the cylinder pressure trace and working out what it does to the hardware. The dynamic module resolves gas and inertia forces along the rod and across the crank throughout the cycle, and the stress calculator sizes and checks the piston, rings, pin, rod and crankshaft against the material limits you specify. That is the part you need if you are actually going to cut metal.
On the two-stroke exhaust calculator the dimensions and the flat-pattern preview are free. What is paid is the file you take to the workshop: a 1:1 PDF to print and trace, or a DXF for a laser or plasma cutter. Pro includes it; if the pipe is all you need, the cone template pack is a single payment instead of a subscription.
Billing
Subscriptions are monthly and are handled by Paddle as the merchant of record, which means Paddle appears on your statement and handles VAT and sales tax for your country. You can pause or cancel from your account at any time, and cancelling leaves you on the free tier rather than locking you out.