楽しい日常計算機

A grab-bag of handy and playful calculators — grades, tire sizes, lottery odds and a few just for fun.

テスト成績計算機

Correct answers Total questions

Turn a score out of any total into a percentage and a letter grade.

Current grade (%) Target overall grade (%) Final exam weight (%)

Find the score you need on your final exam to reach your target grade.

Number

Rewrite any number in scientific notation with its mantissa and exponent.

Numbers in the pool Numbers you pick Bonus ball pool (optional)

Work out the true odds of hitting the jackpot in a pick-n lottery.

Tire size (e.g. 205/55R16)

Decode a tire code into sidewall height, overall diameter and rolling circumference.

Dog age (years) Size

Convert your dog's age into human years, adjusted for breed size.

First name Second name

A playful, repeatable love-match score based on two names — purely for entertainment.

Name

Reduce a name to its numerology number with the classic Pythagorean method — just for fun.