rule of thumb

US /ruːl əv θʌm/
UK /ruːl əv θʌm/
"rule of thumb" picture
1.

経験則, おおよその目安

a broadly accurate guide or principle, based on experience or practice rather than theory

:
As a rule of thumb, always save at least 10% of your income.
経験則として、収入の少なくとも10%は常に貯蓄しなさい。
A good rule of thumb for cooking rice is two parts water to one part rice.
ご飯を炊く際の良い経験則は、水2に対して米1の割合です。