The calculation
index.
Search 100 free tools or browse by field and task. Every calculator exposes its formula, assumptions and result context.
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Percentage Calculator
Find X% of any number.
Percentage Change Calculator
Measure percentage increase or decrease.
Discount Calculator
Calculate sale price and savings.
Tip Calculator
Split a bill with tip.
Age Calculator
Find age between two dates.
Date Difference Calculator
Count days between two dates.
Days Until Calculator
Count days to a target date.
Hourly to Salary Calculator
Convert hourly pay to annual salary.
Salary to Hourly Calculator
Convert annual salary to hourly pay.
Overtime Pay Calculator
Estimate regular and overtime pay.
Weekly Pay Calculator
Calculate gross weekly pay.
Biweekly Pay Calculator
Estimate two-week gross pay.
Pay Raise Calculator
See pay after a raise.
Work Hours Calculator
Calculate hours in a shift.
Freelance Rate Calculator
Estimate a target freelance hourly rate.
Profit Margin Calculator
Calculate profit and margin percentage.
Markup Calculator
Calculate markup from cost and price.
Break-Even Calculator
Find break-even sales volume.
ROI Calculator
Measure return on investment.
ROAS Calculator
Calculate return on ad spend.
CPC Calculator
Find advertising cost per click.
CPM Calculator
Find cost per 1,000 impressions.
CPA Calculator
Find cost per acquisition.
CTR Calculator
Calculate click-through rate.
Customer Acquisition Cost Calculator
Calculate customer acquisition cost.
Average Order Value Calculator
Find average revenue per order.
Conversion Rate Calculator
Find conversion percentage.
Sales Growth Calculator
Measure sales increase or decrease.
Commission Calculator
Estimate commission earnings.
Paint Calculator
Estimate gallons of paint.
Flooring Calculator
Estimate flooring area with waste.
Concrete Calculator
Estimate cubic yards of concrete.
Tile Calculator
Estimate tile quantity.
Gravel Calculator
Estimate gravel volume.
Mulch Calculator
Estimate mulch volume.
Drywall Calculator
Estimate drywall sheet quantity.
Roofing Calculator
Estimate roofing squares.
Fence Calculator
Estimate fence panels and posts.
Square Footage Calculator
Find rectangular area in square feet.
Compound Interest Calculator
Project compound growth.
Simple Interest Calculator
Calculate simple interest.
Savings Goal Calculator
Plan monthly savings toward a goal.
Loan Payment Calculator
Estimate fixed monthly loan payments.
Future Value Calculator
Project a lump sum into the future.
Debt Payoff Calculator
Estimate debt payoff time.
Average Calculator
Find the average of several numbers.
Ratio Calculator
Reduce a ratio to simplest form.
Proportion Calculator
Solve for x in a proportion.
Square Root Calculator
Calculate a square root.
Exponent Calculator
Calculate powers and exponents.
Length Converter
Convert common length units.
Weight Converter
Convert common weight units.
Temperature Converter
Convert Β°C, Β°F and K.
Area Converter
Convert common area units.
Volume Converter
Convert common volume units.
Speed Converter
Convert common speed units.
Data Storage Converter
Convert bytes, MB, GB and TB.
Wall Area Calculator
Estimate wall area for paint or finishes.
Room Area Calculator
Find room floor area from length and width.
Cubic Yard Calculator
Calculate cubic yards from length, width and depth.
Soil Calculator
Estimate soil volume for beds and fill.
Paver Calculator
Estimate paver quantity for a patio or path.
Wallpaper Calculator
Estimate wallpaper rolls from wall area.
Deck Area Calculator
Calculate deck area with waste allowance.
Board Foot Calculator
Calculate board feet for lumber.
Material Waste Calculator
Add a waste allowance to material quantity.
Stair Calculator
Estimate stair risers and tread depth.
Gross Profit Calculator
Find gross profit and gross margin.
Net Profit Margin Calculator
Calculate net profit as a percentage of revenue.
Contribution Margin Calculator
Find contribution margin per unit and percent.
Revenue Goal Calculator
Estimate revenue needed for a target profit.
Product Pricing Calculator
Price a product for a target margin.
Customer Lifetime Value Calculator
Estimate gross-profit customer lifetime value.
Inventory Turnover Calculator
Measure how often inventory turns over.
Monthly to Annual Pay Calculator
Convert monthly pay to annual pay.
Annual to Monthly Pay Calculator
Convert annual pay to monthly pay.
Project Rate Calculator
Turn hours and hourly rate into a project quote.
Billable Hours Calculator
Find hours needed for a revenue target.
Time Card Calculator
Total weekly hours and gross pay.
Savings Growth Calculator
Project savings with monthly contributions.
Mortgage Payment Calculator
Estimate mortgage principal and interest.
CAGR Calculator
Find compound annual growth rate.
Present Value Calculator
Discount a future amount to present value.
Doubling Time Calculator
Estimate years needed to double.
Emergency Fund Calculator
Estimate an expense-based emergency fund target.
Unit Price Calculator
Find price per item, weight or unit.
Fuel Cost Calculator
Estimate trip fuel cost from MPG.
Split Bill Calculator
Split a total bill evenly with optional tip.
Time Duration Calculator
Calculate elapsed hours between two times.
Greatest Common Divisor Calculator
Find the GCD of two integers.
Least Common Multiple Calculator
Find the LCM of two integers.
Fraction to Decimal Calculator
Convert numerator and denominator to decimal.
Decimal to Percent Calculator
Turn a decimal into percent.
Percent to Decimal Calculator
Turn a percent into a decimal.
Time Converter
Convert common time units.
Pressure Converter
Convert common pressure units.
Energy Converter
Convert common energy units.
Power Converter
Convert watts, kW and horsepower.
Angle Converter
Convert degrees, radians and gradians.
Fuel Economy Converter
Convert MPG, km/L and L/100km.