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Finance
Compound growth, loans, repayment planning, and more.
Open finance toolsPrime Calc is a clean multi-page calculator site built for English-speaking users who want fast answers without clutter.
Organized as linked subpages so the site can keep growing without becoming one oversized file.
Compound growth, loans, repayment planning, and more.
Open finance toolsPercentage increase, decrease, reverse percentages, and change calculations.
Open percentagesA conversions hub with dedicated subpages for area, length, volume, weight, temperature, and construction materials.
Open conversions hubEnjoyable number stories about space, nature, rivers, weather, ancient civilizations, Vikings, pyramids, and more.
Open fun facts