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Argon2 Parameters Calculator

Work out argon2 parameters instantly with clear inputs, formula shown and shareable results.

About Argon2 Parameters Calculator

Argon2id is memory-hard, so its defence comes from the memory cost rather than iteration count: an attacker must provide that much memory per parallel guess, which is what breaks cheap GPU and ASIC parallelism. The constraint on your side is that concurrent logins multiply the memory requirement, so 64 MiB with 20 simultaneous logins reserves 1.25 GiB.

Formula

Argon2 resource use

peak memory = memory cost x concurrent logins; time ~ memory x passes x hardware factor; threads = lanes x concurrent logins

Worked example

With the default values below, Argon2 Parameters Calculator returns Peak memory at full login concurrency of 1,280. Change any input above and every figure here is recalculated in your browser.

Inputs used

Memory costaccepts 8–4,096 MiB
64 MiB
Time cost (passes)accepts 1–20
3
Parallelism (lanes)accepts 1–32
4
Concurrent logins to supportminimum 1
20

Results

Peak memory at full login concurrency
1,280 MiB
Estimated hash time
86 ms
Threads consumed at peak
80
Comparison with published guidance
Meets OWASP minimum for Argon2id (19 MiB, t = 2, p = 1)

Step by step

  1. 1Values used
  2. 2Argon2 resource use
  3. 3Peak memory at full login concurrency= 1,280 MiB
  4. 4Estimated hash time= 86 ms
  5. 5Threads consumed at peak= 80
  6. 6Comparison with published guidance= Meets OWASP minimum for Argon2id (19 MiB, t = 2, p = 1)

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Which Argon2 variant should I use?

Argon2id. It combines Argon2i's side-channel resistance in the first pass with Argon2d's stronger resistance to time-memory trade-offs afterwards.

Is more memory always better?

Up to your server's limit. Trade memory against passes: OWASP notes that 19 MiB with two passes and 46 MiB with one pass offer comparable resistance.

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