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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.

Paper Size Converter (A4 / Letter / B-Series / JIS)

Convert between ISO A/B/C, US Letter / Legal / Tabloid and Japanese JIS paper sizes in mm and inches.

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.

Grow Light Distance Calculator

Calculate grow light intensity drop-off (PPFD / lux) by distance using the inverse square law.

Custom Unit Converter (Build Your Own)

Define your own units of measurement and save them — perfect for niche workflows.

Sticker / Decal / Vinyl Size & Cost Calculator

Calculate real-world size from a digital design and sticker cost per unit for Etsy and Cricut sellers.

LED Series Resistor Calculator (Ohm's Law)

Calculate the right series resistor for an LED given supply voltage, forward voltage and current.

Tire Size Comparison Calculator (Plus Sizing)

Compare two tire sizes for diameter, circumference, speedometer error and clearance.

Gear Ratio & Tire Size Regearing Calculator

Calculate speedometer error, RPM change and the new axle gear ratio needed after changing tire size.