Practical calculators for dates, percentages, units, loans, ratios, and everyday planning
This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.
Real-world use
Leave with a calculation result and the assumptions that produced it.
Estimate percentages, dates, units, ratios, and payments
Check sizing before sharing a plan
Copy the result into a report or note
Calculate percentages, percentage change, discounts, markups, and what percent one number is of another.
Calculate exact age from a birth date in years, months, days, and next birthday timing.
Find days, weeks, months, and years between two dates.
Count weekdays between dates and optionally exclude custom holiday dates.
Calculate body mass index from metric or US units with category guidance.
Estimate monthly payments, total interest, and amortization basics for fixed-rate loans.
Calculate percentages, percentage change, discounts, markups, and what percent one number is of another.
Calculate exact age from a birth date in years, months, days, and next birthday timing.
Find days, weeks, months, and years between two dates.
Count weekdays between dates and optionally exclude custom holiday dates.
Calculate body mass index from metric or US units with category guidance.
Estimate monthly payments, total interest, and amortization basics for fixed-rate loans.
Convert common length, weight, temperature, area, volume, and speed units.
Calculate missing width or height while preserving an aspect ratio, or simplify width and height to a ratio.
This calculators collection includes 8 maintained tools for practical calculators for dates, percentages, units, loans, ratios, and everyday planning. The goal is to keep routine work fast: open the tool, complete the task, and leave with copy-ready text or a downloadable result.
We prioritize tools that solve a specific task clearly instead of turning the page into a directory of vague links. The first cards in this category highlight the most broadly useful paths, while the full list covers related one-off tasks.
This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.
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