Redmoon Converters Convert between every standard paper size — ISO A0–A10, B-series, C-series, US Letter / Legal / Tabloid and Japanese JIS — in mm and inches.
| Size | mm | cm | inches | Area (cm²) |
|---|
ISO A-series starts at A0 = 841 × 1189 mm (1 m² area, √2 aspect). Each next size halves the longer dimension. B-series is the geometric mean of consecutive A sizes, and C-series fits A inside (used for envelopes).
The scale ratio is min(B.w/A.w, B.h/A.h) — the largest factor that fits A inside B without cropping. 1 inch = 25.4 mm.
Battery Life Runtime Calculator (mAh)
Calculate how long a battery lasts at a given current draw — mAh to hours, Wh, and screen-on time.
Fertilizer / Nutrient Dilution Calculator
Dilute liquid fertiliser concentrate to target PPM or EC for soil and hydroponics.
Font Size Converter (pt, px, rem, em, %)
Convert font sizes between pt, px, rem, em and % for web and print typography.
Time Zone Overlap Calculator (Remote Teams)
Find overlapping productive hours across up to 8 time zones for distributed teams.
Word Count to Pages Converter (Book / Essay / Manuscript)
Estimate pages from word count by genre, font, size and spacing — novel, essay, manuscript, blog.
Podcast Episode Length Optimiser
Recommended podcast episode length by topic and audience plus file size estimates.