Calculators
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.
47 tools in this category.
Tools in Calculators
Percentage Calculator
Three percentage tools in one: percent of a value, ratio as a percent, and percent change.
Calculators
Age Calculator
Find the exact age in years, months, and days — plus totals and the countdown to the next birthday.
Calculators
Date Calculator
Count the days between two dates, or add and subtract days from any date.
Calculators
Compound Interest Calculator
Project savings growth with compound interest and monthly contributions, year by year.
Calculators
Loan Calculator
Calculate monthly payments, total interest, and a full amortization schedule for any loan.
Calculators
Mortgage Calculator
Estimate monthly mortgage payments, including down payment, property tax, and insurance.
Calculators
Profit Margin Calculator
Calculate profit, margin, and markup from cost and selling price — or find the price needed for a target margin.
Calculators
Grade Calculator
Average your grades and work out what you need on the final to reach your target.
Calculators
Break-Even Calculator
Find out how many units you must sell to cover your costs and start making a profit.
Calculators
VAT Calculator
Add or remove VAT on any amount. Choose a standard rate or enter your own.
Calculators
BMI Calculator
Calculate your Body Mass Index and see where you fall on the healthy range.
Calculators
Tip Calculator
Calculate tip and split a bill fairly across any number of people. Quick presets for 15%, 18%, 20%, 25%.
Calculators
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.
Calculators
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method. Tape measure and a few seconds — no scales required.
Calculators
Ideal Weight Calculator
Calculate your ideal body weight using four clinical formulas (Devine, Robinson, Miller, Hamwi) plus a healthy BMI range.
Calculators
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.
Calculators
Pregnancy Due Date Calculator
Calculate your due date and current pregnancy week from your last period or known conception date. Includes trimester and key milestones.
Calculators
Pace Calculator
Calculate running or cycling pace from time and distance, or finish time from pace and distance. Supports km and miles.
Calculators
Square Footage Calculator
Calculate the area of a single room or a whole floor with multiple rooms. Supports feet, meters, yards, inches, and centimeters.
Calculators
Inflation Calculator
Calculate how inflation erodes purchasing power over time. Custom rate or historical U.S. CPI averages from 1990 onward.
Calculators
Retirement Calculator
Project your retirement savings with monthly contributions, annual raises, and inflation. Year-by-year balance and real (today's-dollar) value.
Calculators
Macro Calculator
Calculate daily protein, carb, and fat grams from a calorie target. Four common splits: balanced, high-protein, low-carb, and keto.
Calculators
Date Add/Subtract Calculator
Add or subtract days, weeks, months, or years from any date. Handles month-end and leap-year rollovers.
Date & Time Tools
Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary. Adjust hours/week and weeks/year.
Calculators
Countdown Timer
Count down to a specific date and time. Set a target, watch the days/hours/minutes/seconds tick down live.
Date & Time Tools
GPA Calculator
Calculate your weighted GPA from course grades and credits. Supports 4.0, 4.3, 5.0, 10.0, and percentage scales.
Calculators
Calorie Calculator (BMR + TDEE)
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Includes a goal-adjusted daily calorie target.
Calculators
Stopwatch
A clean online stopwatch with laps, millisecond precision, and keyboard shortcuts. Runs in your browser.
Date & Time Tools
Pomodoro Timer
A Pomodoro timer with 25/5/15 defaults. Focus, short break, long break, and session counter. Customizable phase lengths.
Date & Time Tools
Permutation & Combination Calculator
Compute nPr and nCr, with optional listing of all arrangements or subsets. Bounded for huge counts.
Math Tools
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.
Text Tools
CIDR Subnet Calculator
Calculate network, broadcast, mask, wildcard, and host range for any IPv4 or IPv6 CIDR block. Pure math, runs in your browser.
Network Tools
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.
Calculators
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.
Calculators
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.
Calculators
Water Intake Calculator
How much water should you drink per day? Based on body weight, activity level, climate, and pregnancy or lactation status.
Calculators
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.
Calculators
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.
Calculators
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.
Calculators
Overtime Pay 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).
Calculators
Calorie Burn Calculator
Calculate calories burned during exercise. Uses the MET (Metabolic Equivalent) model with 24 common activities, or enter a custom MET value.
Calculators
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.
Calculators
Currency Converter
Convert between 30+ world currencies using static daily-refreshed rates. Fast, private, no API key, no tracking, works offline.
Calculators
Reading Level Calculator
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.
Text Tools
Co-founder Equity Calculator
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.
Calculators
NewClick 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.
Web Tools
NewReaction Time Test
Measure your visual reaction time in milliseconds over five rounds, with a median score and per-trial breakdown.
Web Tools