What Is a Tithe?
A tithe is a tenth. In Scripture, God's people brought ten percent of what they grew, earned, and gained back to the Lord as an act of worship. Abraham gave a tenth before the law was given (Genesis 14:20). Israel was commanded into it under Moses (Leviticus 27:30). Jesus affirmed it (Matthew 23:23).
Tithing is not a tax. It is a posture. The first ten percent says God comes first, before bills, before savings, before the next thing you want. That order matters more than the math.
Most teachers ground the tithe in firstfruits, which points to gross income, before taxes. Some give from net. The calculator above handles either. Use it to figure the number for any pay frequency: weekly, biweekly, twice a month, monthly, or annually. Then take it to the Lord and decide what obedience looks like for you.