# Calculators > Quick, accurate calculators for percentages, dates, ages, and finance. URL: https://uttir.com/calculators Tools in this category: 47 ## About this category Simple calculators that give you an answer immediately: percentages, age, date differences, and compound interest. No accounts, no ads above the result, no data leaving your browser. ## Tools - [Percentage Calculator](https://uttir.com/percentage-calculator) — Three percentage tools in one: percent of a value, ratio as a percent, and percent change. - [Age Calculator](https://uttir.com/age-calculator) — Find the exact age in years, months, and days — plus totals and the countdown to the next birthday. - [Date Calculator](https://uttir.com/date-calculator) — Count the days between two dates, or add and subtract days from any date. - [Compound Interest Calculator](https://uttir.com/compound-interest-calculator) — Project savings growth with compound interest and monthly contributions, year by year. - [Loan Calculator](https://uttir.com/loan-calculator) — Calculate monthly payments, total interest, and a full amortization schedule for any loan. - [Mortgage Calculator](https://uttir.com/mortgage-calculator) — Estimate monthly mortgage payments, including down payment, property tax, and insurance. - [Profit Margin Calculator](https://uttir.com/margin-calculator) — Calculate profit, margin, and markup from cost and selling price — or find the price needed for a target margin. - [Grade Calculator](https://uttir.com/grade-calculator) — Average your grades and work out what you need on the final to reach your target. - [Break-Even Calculator](https://uttir.com/break-even-calculator) — Find out how many units you must sell to cover your costs and start making a profit. - [VAT Calculator](https://uttir.com/vat-calculator) — Add or remove VAT on any amount. Choose a standard rate or enter your own. - [BMI Calculator](https://uttir.com/bmi-calculator) — Calculate your Body Mass Index and see where you fall on the healthy range. - [Tip Calculator](https://uttir.com/tip-calculator) — Calculate tip and split a bill fairly across any number of people. Quick presets for 15%, 18%, 20%, 25%. - [Discount Calculator](https://uttir.com/discount-calculator) — Calculate sale prices three ways: X% off a price, what-percent-off between two prices, or the required discount to hit a target. - [Body Fat Calculator](https://uttir.com/body-fat-calculator) — Estimate body fat percentage using the U.S. Navy circumference method. Tape measure and a few seconds — no scales required. - [Ideal Weight Calculator](https://uttir.com/ideal-weight-calculator) — Calculate your ideal body weight using four clinical formulas (Devine, Robinson, Miller, Hamwi) plus a healthy BMI range. - [Work Hours Calculator](https://uttir.com/work-hours-calculator) — Add up hours worked for a day or week, with automatic overtime calculation. Per-day breakdown and configurable daily/weekly OT thresholds. - [Pregnancy Due Date Calculator](https://uttir.com/pregnancy-calculator) — Calculate your due date and current pregnancy week from your last period or known conception date. Includes trimester and key milestones. - [Pace Calculator](https://uttir.com/pace-calculator) — Calculate running or cycling pace from time and distance, or finish time from pace and distance. Supports km and miles. - [Square Footage Calculator](https://uttir.com/square-footage-calculator) — Calculate the area of a single room or a whole floor with multiple rooms. Supports feet, meters, yards, inches, and centimeters. - [Inflation Calculator](https://uttir.com/inflation-calculator) — Calculate how inflation erodes purchasing power over time. Custom rate or historical U.S. CPI averages from 1990 onward. - [Retirement Calculator](https://uttir.com/retirement-calculator) — Project your retirement savings with monthly contributions, annual raises, and inflation. Year-by-year balance and real (today's-dollar) value. - [Macro Calculator](https://uttir.com/macro-calculator) — Calculate daily protein, carb, and fat grams from a calorie target. Four common splits: balanced, high-protein, low-carb, and keto. - [Date Add/Subtract Calculator](https://uttir.com/date-add-subtract) — Add or subtract days, weeks, months, or years from any date. Handles month-end and leap-year rollovers. - [Salary Calculator](https://uttir.com/salary-calculator) — Convert between hourly, daily, weekly, biweekly, monthly, and annual salary. Adjust hours/week and weeks/year. - [Countdown Timer](https://uttir.com/countdown-timer) — Count down to a specific date and time. Set a target, watch the days/hours/minutes/seconds tick down live. - [GPA Calculator](https://uttir.com/gpa-calculator) — Calculate your weighted GPA from course grades and credits. Supports 4.0, 4.3, 5.0, 10.0, and percentage scales. - [Calorie Calculator (BMR + TDEE)](https://uttir.com/calorie-calculator) — Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Includes a goal-adjusted daily calorie target. - [Stopwatch](https://uttir.com/stopwatch) — A clean online stopwatch with laps, millisecond precision, and keyboard shortcuts. Runs in your browser. - [Pomodoro Timer](https://uttir.com/pomodoro-timer) — A Pomodoro timer with 25/5/15 defaults. Focus, short break, long break, and session counter. Customizable phase lengths. - [Permutation & Combination Calculator](https://uttir.com/permutation-combination) — Compute nPr and nCr, with optional listing of all arrangements or subsets. Bounded for huge counts. - [Sentence Length Checker](https://uttir.com/sentence-length-checker) — Check the length of every sentence in your text. Find sentences that are too long and see the average, median, and length distribution. - [CIDR Subnet Calculator](https://uttir.com/cidr-subnet-calculator) — Calculate network, broadcast, mask, wildcard, and host range for any IPv4 or IPv6 CIDR block. Pure math, runs in your browser. - [Paycheck Calculator](https://uttir.com/paycheck-calculator) — Calculate your take-home pay per period. Federal income tax (2024 brackets), Social Security, Medicare, state tax, and pre-tax deductions. Math runs locally in your browser. - [Sleep Calculator](https://uttir.com/sleep-calculator) — Find the best bedtime or wake-up time based on 90-minute sleep cycles. Avoid grogginess by waking at the end of a cycle. - [One-Rep Max Calculator](https://uttir.com/one-rep-max-calculator) — Estimate your 1-rep max from any rep count using Epley or Brzycki formulas. See working weights at 50-90% of your max. - [Water Intake Calculator](https://uttir.com/water-intake-calculator) — How much water should you drink per day? Based on body weight, activity level, climate, and pregnancy or lactation status. - [Savings Goal Calculator](https://uttir.com/savings-goal-calculator) — Find the monthly contribution needed to reach a savings goal, or how long your monthly contribution will take. Accounts for compound interest. - [Rental Yield Calculator](https://uttir.com/rental-yield-calculator) — Calculate gross yield, net yield (cap rate), and cash-on-cash return for a rental property. Includes monthly cash flow and time to recoup. - [Loan Amortization Calculator](https://uttir.com/loan-amortization-calculator) — Generate a full month-by-month amortization schedule for any loan. See principal vs interest, total cost, and the full payment table. - [Overtime Pay Calculator](https://uttir.com/overtime-calculator) — Calculate weekly pay with overtime. Supports US standard (1.5x after 40 hours/week) and California (1.5x after 8h/day, 2x after 12h/day). - [Calorie Burn Calculator](https://uttir.com/calorie-burn-calculator) — Calculate calories burned during exercise. Uses the MET (Metabolic Equivalent) model with 24 common activities, or enter a custom MET value. - [Rent vs Buy Calculator](https://uttir.com/rent-vs-buy-calculator) — Compare the total cost of renting vs buying a home over a time horizon. Accounts for mortgage, taxes, insurance, maintenance, appreciation, and opportunity cost of the down payment. - [Currency Converter](https://uttir.com/currency-converter) — Convert between 30+ world currencies using static daily-refreshed rates. Fast, private, no API key, no tracking, works offline. - [Reading Level Calculator](https://uttir.com/reading-level) — Check how hard your text is to read. Six readability formulas (Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, Automated Readability Index) in one tool, all in your browser, no upload. - [Co-founder Equity Calculator](https://uttir.com/cofounder-equity) — Split startup equity between co-founders, see the 4-year vesting schedule with 1-year cliff, and simulate dilution from a future funding round. Free, in your browser, no upload. - [Click Speed Test](https://uttir.com/click-speed-test) — Measure your clicks per second (CPS) over 1, 5, 10, or 30 seconds. Works with touch too, and keeps your personal best on this device. - [Reaction Time Test](https://uttir.com/reaction-time-test) — Measure your visual reaction time in milliseconds over five rounds, with a median score and per-trial breakdown. --- For the full HTML page, visit https://uttir.com/calculators. This file is the markdown rendering at https://uttir.com/calculators.md.