Calculator for HR
22 calculator tools hand-picked for HR.
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Age Calculator
Calculate your exact age — years, months, days, hours. Compare two dates or count to a future date.
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Blood Alcohol Content (BAC) Calculator
Widmark-formula BAC estimate from drinks, body weight, sex and time — educational only, never a fit-to-drive verdict — browser-only
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BMI Calculator
Body Mass Index calculator with WHO + Asian classifications — metric and imperial — browser-only
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Calorie Deficit Calculator
Pick a daily calorie deficit, enter your current and goal weight, and see how many weeks it takes and the date you'd hit your target — with a safety check, browser-only
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Calories Burned Calculator
MET-based calorie burn for 30+ activities — running, cycling, swimming, HIIT, housework — stack and total — browser-only
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Date Difference Calculator
Days / weeks / months / years between two dates — plus business-days mode — browser-only
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Ideal Weight Calculator
Devine + Robinson + Miller + Hamwi formulas, side by side, plus the healthy BMI weight band — metric and imperial — browser-only
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China Income Tax Calculator
China personal income tax calculator — monthly, annual, with 5 insurance + 1 fund deductions.
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Percentage Calculator
5 common percentage calculations — "x% of y", "x is what% of y", percentage change, increase/decrease — instant, browser-only
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Barbell Plate Calculator
Target weight → exactly which plates to slide on each end — kg & lb, with a live barbell diagram — browser-only
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Pregnancy Weight Gain Calculator
Pre-pregnancy BMI + week → IOM recommended total gain, the by-week target, and an on-track check — singleton & twins — browser-only
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Random Number Generator
Generate cryptographically-secure random integers — single or batch, with/without duplicates — browser-only
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Salary Raise Calculator
Turn a raise into real numbers — new salary by year/month/hour, dollar increase, and the inflation-adjusted raise that tells you if you actually came out ahead
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Salary to Hourly Converter
Hourly ⇄ daily ⇄ weekly ⇄ monthly ⇄ annual pay — set your hours/week and weeks/year, see all five at once — browser-only
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Take-Home Pay Calculator
Gross → net pay, any country — your own tax rate, pre-tax & post-tax deductions, reverse-solve — browser-only
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Time Card Calculator
Weekly time card — clock in/out + lunch → daily hours, weekly total, gross pay, 40h overtime — browser-only
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Time Duration Calculator
Hours between two times, add or subtract time, and add up a timesheet — decimal hours + pay — browser-only
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Timezone Converter
Convert any time between any two timezones — DST-aware, IANA database — browser-only
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Timezone Meeting Planner
Plan meetings across timezones — see when everyone's working hours overlap.
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Unit Converter
Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only
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Waist-to-Hip Ratio Calculator
WHR = waist ÷ hip, scored against the WHO health-risk bands by sex, with an optional waist-to-height check — runs entirely in your browser
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Work Anniversary Calculator
Work tenure calculator — service years, annual leave entitlement (China), retirement countdown.