Quick Tools
Free calculators that run in your browser
Single-purpose tools for loans, pay, materials, and schoolwork. Open one, type your numbers, and read the result on the page.
- 74 free tools
- Runs in your browser
- No signup
Open a calculator and get a result in seconds.
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Most used
Eight tools to open first: salary increase, discount, factoring, break-even, gravel, high school GPA, tip, and dew point.
- Finance
Salary Increase Calculator
New yearly pay after a raise, or the percent from a new salary.
Open - Finance
Discount Calculator
Sale price, dollars saved, and original price from a percent or dollar off.
Open - School
Factoring Calculator
Factor whole numbers into primes and factor quadratic trinomials with steps.
Open - Finance
Break Even Calculator
Units and revenue needed to cover fixed plus variable costs.
Open - Building / DIY
Gravel Calculator
Cubic yards, tons, and bag counts from length, width, and depth.
Open - School
High School GPA Calculator
Weighted and unweighted 4.0 GPA from your courses, credits, and level.
Open - Finance
Tip Calculator
Tip amount, total bill, and a per-person split from bill and percent.
Open - NewBuilding / DIY
Dew Point Calculator
Estimate dew point from air temperature and relative humidity.
Open
Business
Google Review Link Generator
Turn a Maps URL or Place ID into a review link, a QR code, and a counter card you can print. Short guides for restaurants, plumbers and HVAC, and salons.
Pay
Salary Increase Calculator
A pay raise calculator for a percentage increase in salary: new pay after a percent raise, the percent from a new salary, hourly to annual, and the monthly or biweekly paycheck difference.
Categories
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Every live tool. Search and the category filter apply together.
74 tools
- Finance
Salary Increase Calculator
New yearly pay after a raise, or the percent from a new salary.
Open - School
High School GPA Calculator
Weighted and unweighted 4.0 GPA from your courses, credits, and level.
Open - Finance
HELOC Calculator
Estimate max line, remaining equity, and HELOC interest or P&I payments.
Open - Finance
CD Interest Rate Calculator
Certificate-of-deposit interest calculator with APY/APR and compounding frequency. For people comparing bank CD offers. Not a bank, not tax advice, not a rate lock.
Open - %School
Percentage Calculator
Find X% of Y, what percent one number is of another, percent change, and an optional percent table.
Open - { }Dev
JSON Formatter
in-browser JSON pretty-printer, minifier, and syntax validator.
Open - Building / DIY
Concrete Calculator
Cubic yards, cubic feet, and 60- or 80-lb bag counts for slabs, footings, and columns.
Open - Finance
Markup Calculator
Convert cost and markup into selling price, profit per unit, and gross margin.
Open - Finance
Amortization Calculator
Monthly P&I payment plus a year-by-year principal vs interest schedule.
Open - Health
Ovulation Calculator
Estimate ovulation and a six-day fertile window from last period and cycle length.
Open - Finance
Mortgage Payoff Calculator
Add extra monthly or lump-sum payments to see a new payoff date and interest saved.
Open - Finance
Mortgage Refinance Calculator
Compare your current mortgage to a refinance: new payment, interest, and break-even.
Open - Finance
Personal Loan Calculator
Monthly payment, total interest, and a payoff schedule for unsecured personal loans.
Open - Dev
Barcode Generator
Encode a SKU or number as Code 128, Code 39, EAN-13, or UPC-A and download PNG or SVG.
Open - Finance
Tip Calculator
Tip amount, total bill, and a per-person split from bill and percent.
Open - Building / DIY
Square Footage Calculator
Length × width for rooms in feet, inches, or meters, plus sq ft ↔ sq m.
Open - Finance
Student Loan Calculator
Monthly payment, total interest, and payoff date from remaining balance, APR, and term.
Open - Finance
Overtime Calculator
Time-and-a-half, double-time, and weekly gross from hourly rate and overtime hours.
Open - .*Dev
Regex Tester
Test JavaScript regular expressions with live match highlighting.
Open - Finance
Work Hours Calculator
Add clock-in/out times and breaks to total hours for a day or week.
Open - Building / DIY
Roofing Calculator
Roof squares, pitch-adjusted area, and bundle estimates from footprint and pitch.
Open - Finance
Credit Card Payoff Calculator
See months to zero and interest paid from balance, APR, and monthly payment.
Open - Finance
Discount Calculator
Sale price, dollars saved, and original price from a percent or dollar off.
Open - Health
1 Rep Max Calculator
Epley and Brzycki one-rep max estimates from the weight and reps you lifted.
Open - Finance
Margin Calculator
Margin percent, markup percent, and dollar profit from cost and selling price.
Open - School
Ratio Calculator
Simplify ratios, scale A:B parts, and find missing values.
Open - Building / DIY
Millimeters to Inches Converter
Convert mm ↔ inches with exact 25.4 factor and fraction readout.
Open - Dev
UPC Generator
Build a valid UPC-A barcode digit string with check digit.
Open - Building / DIY
Sod Calculator
Estimate sod rolls or pallets from lawn area and waste factor.
Open - Date / Time
Date Calculator
Add or subtract days, or count days between two dates.
Open - Finance
Break Even Calculator
Units and revenue needed to cover fixed plus variable costs.
Open - Health
Period Calculator
Estimate upcoming period dates from last start date and cycle length.
Open - Dev
Subnet Calculator
CIDR to netmask, hosts, network, and broadcast for IPv4.
Open - School
GCF Calculator
Find the greatest common factor of two or more numbers, with prime factors and Euclid's steps.
Open - School
Factoring Calculator
Factor whole numbers into primes and factor quadratic trinomials with steps.
Open - Building / DIY
Gravel Calculator
Cubic yards, tons, and bag counts from length, width, and depth.
Open - School
Pythagorean Theorem Calculator
Find a missing side of a right triangle, plus area, perimeter, and angles.
Open - School
Standard Deviation Calculator
Get sample and population standard deviation, variance, and mean from a list of numbers.
Open - School
Slope Calculator
Find the slope between two points, plus the angle, percent grade, and line equation.
Open - NewBuilding / DIY
Dew Point Calculator
Estimate dew point from air temperature and relative humidity.
Open - NewFinance
Simple Interest Calculator
Interest and ending balance from principal, rate, and time — I = Prt.
Open - NewBuilding / DIY
Carpet Calculator
Turn room dimensions into square yards of carpet and padding, with waste and cost.
Open - NewBuilding / DIY
Mulch Calculator
Cubic yards and bag counts from bed area and mulch depth.
Open - NewSchool
Integer Calculator
Add, subtract, multiply, and divide integers with step-by-step work shown.
Open - NewFinance
APY Calculator
Convert APR and compounding into APY, plus optional interest earned.
Open - NewSchool
Systems of Equations Calculator
Solve 2x2 and 3x3 systems of linear equations with elimination or Cramer's rule steps.
Open - NewSchool
Long Division Calculator
Divide with remainders or decimals and see every long division step laid out.
Open - NewBuilding / DIY
Tile Calculator
Tile count and square footage from room size, tile size, grout, and waste.
Open - NewSchool
Density Calculator
Solve for density, mass, or volume from the other two, with unit conversion.
Open - NewBuilding / DIY
Brick Calculator
Bricks and mortar for a wall from its size, openings, brick size, and joints.
Open - NewSchool
Mean Median Mode Calculator
Paste numbers to get mean, median, mode, and range with the sorted data shown.
Open - NewSchool
Significant Figures Calculator
Count sig figs, round to N significant figures, and apply sig-fig rules to arithmetic.
Open - NewSchool
Quadratic Formula Calculator
Solve ax^2 + bx + c = 0 with the quadratic formula, including complex roots and steps.
Open - NewBusiness
Google Review Link Generator + QR Code
Turn a Maps URL or Place ID into a Google review link, QR code, and counter card.
Open - NewSchool
EOC Grade Calculator
Combine your course average with an end-of-course (EOC) exam score to get your final grade.
Open - NewBuilding / DIY
Watts to Amps Calculator
Convert watts to amps for DC, single-phase AC, and three-phase circuits.
Open - NewBuilding / DIY
BTU Calculator
Estimate AC or heater BTUs from room size and climate factors.
Open - NewBuilding / DIY
Voltage Drop Calculator
Estimate voltage drop and percent drop for a wire run by gauge, length, load, and material.
Open - NewSchool
Scientific Notation Calculator
Convert numbers to and from scientific, E, and engineering notation, and do arithmetic in it.
Open - NewBuilding / DIY
Grass Seed Calculator
Estimate pounds and bags of grass seed for a new lawn or overseeding by grass type.
Open - NewHealth
Steps Per Mile Calculator
Estimate steps per mile from height or stride, then turn a step count into miles.
Open - NewSchool
Fantasy Football Calculator
Project fantasy points from yards, touchdowns, receptions, and turnovers.
Open - NewSchool
Log Calculator
Calculate logarithms in any base, including log10, ln, and log2, with change of base shown.
Open - NewBuilding / DIY
Drywall Calculator
Estimate drywall sheets, screws, tape, and joint compound for walls and ceilings.
Open - NewBuilding / DIY
Stair Calculator
Compute rise, run, tread count, and stringer length for stairs.
Open - NewBuilding / DIY
Wire Gauge Calculator
Pick the minimum AWG wire size for a load, run length, voltage, and allowed voltage drop.
Open - NewBuilding / DIY
Paver Calculator
Estimate how many pavers, plus base gravel and bedding sand, a patio or walkway needs.
Open - NewSchool
Point Slope Form Calculator
Write the equation of a line in point-slope form from a point and slope or from two points.
Open - NewBuilding / DIY
MB to GB Converter
Convert megabytes to gigabytes (and back) in decimal or binary units.
Open - NewSchool
Dice Roller
Roll any dice (d4 to d100) with counts, modifiers, and dice notation like 2d6+3.
Open - NewDev
Base64 Decoder & Encoder
Decode or encode Base64 text in the browser, with UTF-8 and URL-safe support.
Open - NewBuilding / DIY
Conduit Fill Calculator
Check conduit fill percentage from wire size, wire type, and conduit trade size.
Open - NewBuilding / DIY
Acreage Calculator
Convert lot dimensions or square feet to acres, hectares, and square meters.
Open - NewSchool
Aspect Ratio Calculator
Find an image or screen aspect ratio, or resize width and height while keeping it.
Open
How Quick Tools works
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Open a calculator and use it. There is no account and no payment to run the math.
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The numbers you type stay in the browser. They are not stored as a profile on our server.
Labeled partner links
A recommendation is marked. You can ignore it and still use the tool.
Partner links, when we recommend a product, are labeled. How partner links work.