Printable month calendar generator

The response returns structured week rows, rotated English weekday headers, and stable labels for pipelines.

Year, month, and configurable first weekday

Send two required integers: year in the supported Gregorian range, and month as one for January through twelve for December. Optional first_weekday is an integer from zero through six where zero means Sunday, one means Monday, and six means Saturday; omit it to keep the common Sunday-start layout used on many printable wall calendars in the United States. Aliases y and yr for year, m and mon for month, and week_start or start_weekday for the week origin are accepted when documented. Identical inputs always produce identical JSON because the path is pure integer logic with no network, no random seed, and no wall clock. Missing fields, non-integers, years outside the published bounds, first_weekday outside zero through six, and any month less than one or greater than twelve raise invalid_input so callers can fix the request instead of receiving a silently rolled-over month that would misprint an entire sheet.

Reading weeks, headers, and day padding

Because padding is explicit nulls, renderers never have to recompute column offsets themselves. On success the response echoes the normalized year and month, a month_name string in English for titles, and days_in_month as the integer length of that month. The is_leap_year flag reports whether the year is a Gregorian leap year even when the month is not February. first_weekday and first_weekday_name describe the week origin you requested; first_of_month_weekday and its name locate day one on the absolute Sunday-through-Saturday scale so UIs can highlight the true start without guessing. weekday_headers is a seven-element array of English weekday names rotated so the first column matches your first_weekday—for example Monday through Sunday when first_weekday is one. The weeks array is the heart of the contract: each entry has a week_index and a days array of length seven where each slot is either a day number from one through days_in_month or null for empty padding before the first and after the last. week_count is the number of rows, typically four to six. calendar is always gregorian and method is always month_calendar for stable branching in tests. Use weekday_headers for table column titles, weeks for the body cells of a printable grid, and days_in_month when you also need a caption with the month length.

API usage, pricing, print workflows, and practical limits

Call the free in-browser printable month calendar generator for lesson plans, family planners, design mockups, and quick verification without installing calendar libraries. Keep months strictly in one through twelve so bad form values surface early instead of wrapping into the next year. Year bounds follow the published parameter range for isolate safety and common civil use. Send a JSON body with required integer fields year and month, plus optional first_weekday when you need a Monday-start or other regional layout. Use the prepaid API when a print pipeline, classroom generator, scheduling product, or multi-tenant planner needs a stable contract under KIT balance at $0.002 per successful item; validation failures never consume balance after the engine rejects the payload. Pair this endpoint with a days-in-month check when you only need length, or with invite builders when the next step is an event file rather than a month grid—those are different search intents and different products. Authors shipping SDKs can map weeks into HTML tables or PDF cells column by column using weekday_headers as thead labels and null slots as empty cells ready for print CSS.