Subathon Calculator

How the math works

Total time = starting time + (Tier 1 subs × seconds) + (Tier 2 subs × seconds × Tier 2 multiplier) + (Tier 3 subs × seconds × Tier 3 multiplier) + (gifted subs × seconds) + (full hundreds of bits × seconds) + (dollars × seconds). If you set a maximum length, anything above it is cut off, and the calculator shows how much time was lost to the cap.

Bits count per full 100: 250 bits count as 2 × 100. That is how most subathon timers round.

The break-even rate

The timer loses one hour every hour. If one sub adds 60 seconds, you need 60 subs an hour just to stay level. The calculator shows this “break-even” number for each event type, which is the fastest way to check whether a rule is realistic for your channel. For most channels a rule where break-even is far above your normal hourly subs means the subathon ends within the starting time.

Picking fair values

• Keep money-based rules consistent: a Tier 1 sub costs viewers about as much as 500 bits or a $5 tip, so many streamers give those the same time.
• Set a max length before you go live. Viewers enjoy pushing the timer, but a cap protects your sleep.
• Write the rules in your stream title or a panel so viewers know what each event is worth.

Last checked: 2026-09-24.

FAQ

How much time should a sub add in a subathon?

Common values are 30 seconds to 5 minutes per Tier 1 sub. Use the break-even number: if you normally get 10 subs an hour, 60 seconds per sub means the timer will shrink unless activity goes up.

How do Tier 2 and Tier 3 subs count?

They use the Tier 1 time times a multiplier. The defaults, 2× and 5×, follow the price of each tier.

Does this calculator run the timer on stream?

No, it only plans the numbers. For an on-screen timer that adds time automatically, see the product below, or use the countdown timer tool for a simple fixed countdown.

Can I use it for Kick or YouTube memberships?

Yes. Enter your subs or memberships in the Tier 1 field and tips in the dollar field.