Shopping & Pricing
Monthly or annual billing: which costs less for your usage period?
Tools to use
Dividing an annual fee by twelve can look cheaper, but how long will you use the service? Without refunds, six months of use can still cost a full year. This calculator compares payments required for a chosen period rather than the appearance of a monthly equivalent. Try two fictional plans around their renewal boundary.
Compare monthly 1200 and annual 12000
Use JPY and twelve months. A is monthly 1200; B annual 12000. A pays twelve times, totaling 14,400; B once, totaling 12,000, a 2,400 difference. Enter the full annual fee in an annual field, not an advertised '1000 per month' equivalent.
Months A: 1200 JPY/month B: 12000 JPY/year
6 7200 12000
10 12000 12000
12 14400 12000
13 15600 24000
24 28800 24000Start with two slots and add up to ten. Each can be monthly or annual; their roles are not fixed. Give plans clear names and align tax inclusion and other input assumptions. Blank fees are not free plans; enter zero explicitly for a free candidate.
Six months changes the monthly-equivalent picture
At six months, A is 7,200 and B remains 12,000, not prorated to 6,000. The model prepays each billing cycle and gives no refund for unused time. B's average over six months of actual use is 2,000, unlike the annual fee divided by twelve.
The paid coverage is twelve months with six unused months. This does not automatically judge the purchase a mistake; it exposes what the planned use pays for. If duration is uncertain, compare both a short and long scenario instead of treating one forecast as certain.
A ten-month tie does not make annual billing forever cheaper
Both cost 12,000 at ten months. B is cheaper at eleven and twelve, but month thirteen requires its second annual payment, totaling 24,000 against A's 15,600. 'Annual wins forever after ten months' overlooks the renewal step.
For H months, monthly payment count is H and annual count is ceil(H/12). It rounds up required billing cycles rather than prorating the fee. Twenty-four months needs two annual payments; twenty-five needs three. Inspect the period-comparison table near your intended stopping month.
Account separately for costs outside this model
The current screen covers fixed monthly or annual fees only. It has no inputs for setup charges, cancellation fees, free periods, usage charges, proration, refunds or changing prices. Comparing base fees alone does not fully compare contracts containing those terms. Check tax inclusion, features and minimum commitments separately.
Nonrenewing or refundable plans differ from this model. 'Annual plan' alone does not specify when payment occurs or what happens on cancellation. Verify timing, coverage and exit terms. Cheapest here means lowest entered cost, not a contract review or service-quality recommendation.
Judge the difference alongside your expected duration
Using A as reference helps track when B costs more or less. With more candidates, two tied plans need not be globally cheapest. Keep names and conditions clear, distinguish ties from minima, and resolve invalid entries before including them in the comparison.
Compare stopping at six months, using twelve and extending to thirteen to see the effect of a small schedule change. Price, required features and willingness to continue are separate judgments. The tool exposes the cost part and performs no subscription or notification action; review the real service's conditions before deciding.
Compare uncertain durations without inventing certainty
Suppose you plan to try a learning service for six months and continue for another six only if it works for you. The duration is not yet known. Keep the two outcomes separate: monthly billing saves 4,800 JPY if you stop at six months; annual billing saves 2,400 if you continue for twelve. The tool has no probability of continuation and therefore does not calculate an expected value or recommend a commitment.
Add C at 1,100 JPY per month. At ten months A and B still tie at 12,000, but C costs 11,000 and is cheapest overall. At twelve months C costs 13,200, so B wins; at thirteen C costs 14,300 against B's 24,000. A break-even point between two candidates is not automatically the answer after another candidate is added.
When sharing the result, 'B is 1,000 per month' is incomplete. Say '12,000 JPY prepaid for twelve months, no partial refund, saving 2,400 versus A.' The monthly equivalent is total cost divided by months of use, not a promise of monthly card charges. Cash needed at payment time and average cost are different views of the same contract.