Weekly subscriptions and MRR

Updated 2026-08-04

Weekly billing is everywhere in mobile apps and almost absent from web SaaS. That asymmetry means a lot of analytics tooling handles it badly — and the error is always in the same direction.

The correct conversion

monthly equivalent = weekly price × 52 ÷ 12
                   = weekly price × 4.3333

A $4.99/week subscription is $21.62 of MRR.

The mistake

Multiplying by 4, because there are "about four weeks in a month".

There are 4.345 weeks in an average month. Using 4 undercounts by 7.7% — consistently, invisibly, in the direction that makes you look worse than you are.

At 500 weekly subscribers on a $4.99 plan:

• Correct: $10,808 MRR
• Using ×4: $9,980 MRR
• Missing: $828/month, or nearly $10,000 a year

Why weekly plans exist

They're a mobile-app pricing pattern. A $4.99/week price reads as cheaper than $21.62/month even though it's the same money, and the shorter commitment converts better on impulse.

The trade-off is churn: weekly subscribers make a renewal decision four times as often, so weekly cohorts almost always decay faster. If you run weekly pricing, watch retention closely — high MRR from weekly plans is more fragile than the same MRR from annual ones.

Fortnightly and daily

Same principle:

Daily uses 365 ÷ 12 = 30.4167, not 30 — a 1.4% difference.

Convert any interval here.

Checking your own tooling

If you run weekly plans, it's worth verifying what your dashboard does with them. Take one weekly subscriber at a known price and see whether the reported MRR contribution is price × 4.333 or price × 4. Plenty of tools quietly do the latter, and some ignore weekly intervals entirely.

FRGMNT normalises weekly plans at 52 ÷ 12 alongside monthly and annual, across every connected platform. See how to calculate MRR properly.