Free, fast tools for everyday life
No account required. No data collected. All calculations happen directly in your browser.
QuicklyTools is a growing collection of free online calculators for the everyday questions money, health, and time keep throwing at you. Estimate your take-home pay after taxes, work out a loan payment, check your BMI, find your running pace, calculate a pregnancy due date, split a restaurant bill, or convert between units — each one is built to give you a clear answer in seconds.
There are no accounts, no pop-ups, and no tracking of your inputs. Every calculation runs entirely in your browser, so the numbers you type never leave your device. And when you want to understand the math behind a result, our in-depth guides explain how each tool works in plain English.
Choose a tool
Paycheck Calculator
Estimate your take-home pay after federal tax, state tax, Social Security, and Medicare.
Use ToolShift Work Schedule
Generate a 4-week calendar for Panama, Pitman, 4-on-4-off, and DuPont rotations.
Use ToolRunning Pace Calculator
Calculate pace, predict finish times, and forecast race results using the Riegel formula.
Use ToolPregnancy Calculator
Find your due date, current week, trimester milestones, and fertile window.
Use ToolColor Contrast Checker
Check WCAG AA/AAA contrast ratios for text and get suggested accessible color alternatives.
Use ToolLoan Calculator
Calculate monthly payments and total interest for any loan or mortgage.
Use ToolTip Calculator
Split the bill and calculate tip for any party size.
Use ToolBMI Calculator
Calculate your Body Mass Index and healthy weight range.
Use ToolUnit Converter
Convert length, weight, temperature, and volume between any units.
Use ToolAge Calculator
Find your exact age in years, months, and days — or the difference between any two dates.
Use ToolWhy QuicklyTools?
Instant results
No loading spinners. Results appear as you type.
Private by default
Everything runs in your browser. Nothing leaves your device.
Works everywhere
Fully responsive. Works great on phone, tablet, and desktop.
From our guides
View all →How Your Pregnancy Due Date Is Calculated (and Why It's an Estimate)
Your due date is a single day, but only about 1 in 20 babies arrive on it. Here's how the 40-week estimate is built and what the milestones mean.
Tipping in the United States: A Practical Guide for Every Situation
Restaurants, bars, delivery, rideshare, salons, hotels — a situation-by-situation guide to what to tip in the US, and how to handle automatic service charges.
What's a Good Running Pace? A Realistic Guide by Age and Goal
A 'good' pace depends on your age, experience, and what you're training for. Here's how to set a realistic target and predict your race times.