Example 1
- base 1 s
- attempt 3
- multiplier 2
8,0000 s
How many s at 1, attempt 3 and ×2? 8,0000 s. A delay sequence, not a live client.
Retry backoff
Type a base, an attempt, and a multiplier. 1, 3 and 2 give 8,0000 s. 0.5, 5 and cap 10 give 10,0000 s. 2 and attempt 0 give 2,0000 s. A delay sequence, not a live client.
Results
Enter data and click Calculate.
base × multiplier^attempt, with an optional cap. Not a live HTTP client. The window limit sits on the API Rate Limit Calculator.
How it works
Retry backoff in this calculator times a pause from a sequence. 1 s, attempt 3 and multiplier 2 give 8,0000 s. 0.5, attempt 5, ×2 and cap 10 give 10,0000 s. 2 s and attempt 0 give 2,0000 s. Formula: base × multiplier^attempt. This is not a live client.
Fields: rb-base, rb-attempt, rb-mult, optional rb-max and rb-jitter. 1 × 2^3 = 8. 0.5 × 2^5 = 16, clipped to 10. 2 × 2^0 = 2. Jitter in the second example is 20, but primary stays the cap or the delay, not a random sample.
8,0000 s does not come from axios. 10,0000 s is not Retry-After. 2,0000 s is not a live client. You type the base and the attempt. The calculator does not call an API.
API rate limit next door multiplies RPM by a window. Duration stacks hours. Here 1, 3 and 2 stay 8,0000 s, a delay sequence.
Type 1, 3 and 2, then Calculate. The result is 8,0000 s. A comma in 0,5 works. A blank attempt is a field error. This is not a live retry.
1, 3 and 2 give 8,0000 s. 0.5, 5 and cap 10 give 10,0000 s. 2 and 0 give 2,0000 s. Another attempt at 1 changes 8,0000 s.
Formula
delay = base × multiplier^attempt, then an optional cap. A sequence, not a live client.
How to use
- Type base 1, attempt 3, and multiplier 2.
- Click Calculate. The result is 8,0000 s.
- 0.5, 5 and cap 10 give 10,0000 s. 2 and attempt 0 give 2,0000 s.
- A delay sequence, not a live client.
- A request window sits on the API Rate Limit Calculator.
1 s, attempt 3 and ×2 = 8,0000 s
base × multiplier^attempt. 1, 3 and 2 give 8,0000 s. A sequence, not a live client.
- Retry
- The pause from the sequence. 1, 3 and 2 leave 8,0000 s. Not axios.
- backoff
- multiplier^attempt. 0.5 and 5 with cap 10 give 10,0000 s.
- attempt
- Field rb-attempt. 0 at base 2 leaves 2,0000 s.
Examples
Example 2
- base 0.5 s
- attempt 5
- multiplier 2
- cap 10
- jitter 20
10,0000 s
What about 0.5, 5 and cap 10? 10,0000 s. 16 clipped to 10.
Example 3
- base 2 s
- attempt 0
- multiplier 2
2,0000 s
What about 2 and attempt 0? 2,0000 s. 2^0 leaves the base.
Related calculators
Common questions
How many s at 1, attempt 3 and ×2?
8,0000 s. 1 × 2^3. A sequence, not a live client.
What about 0.5, 5 and cap 10?
10,0000 s. 0.5 × 2^5 = 16, clipped to 10.
What about 2 and attempt 0?
2,0000 s. 2 × 2^0 leaves the base.
Is this a live HTTP client?
No. Sequence fields. The calculator does not call an API and does not read 429.
Does jitter randomize 10,0000 s?
No. Jitter is a band. The result stays the cap or the delay.
Does a comma in 0,5 work?
Yes. 0,5, 5 and cap 10 give 10,0000 s.
Is 8,0000 s Retry-After?
No. A result from a base and an attempt. Not a header.
Where do I count a rate-limit window?
On the API Rate Limit Calculator. Here 8,0000 s stays.
Does a blank attempt count?
No. The attempt must be a number. Zero is legal and leaves the base.
Knowledge sources
The calculator counts bits, bytes or throughput from your numbers. Below are SI and bit definitions (NIST).
Page updated in 2026.