Live
Percentage Calculator
Calculate percentage of a number, percentage change, and what percent one number is of another.
Calculator Directory
Free calculators for math, business, planning, and everyday decisions.
Use practical calculators for percentages, automation ROI, business planning, time savings, finance, construction, health, science, dates, and everyday problem-solving.
Live calculators
Available now
These calculators are currently available and run directly in your browser.
Live
Automation ROI Calculator
Estimate time savings, labor savings, payback period, first-year value, and return on automation work.
Calculator categories
Browse by calculator type
These categories keep the calculator section organized as UtilTrove grows.
Math Calculators
Percentages, ratios, averages, fractions, exponents, algebra helpers, and general math tools.
Open percentage calculator →Business Calculators
Automation ROI, time savings, labor cost, pricing, profit margin, break-even, and productivity calculators.
Open automation ROI calculator →Financial Calculators
Budgeting, savings, loans, interest, debt payoff, investment estimates, and monthly payment calculators.
Coming soon →Date & Time Calculators
Date differences, time duration, workdays, countdowns, age, deadlines, and scheduling calculators.
Coming soon →Construction Calculators
Area, material estimates, flooring, paint, concrete, lumber, square footage, and project planning tools.
Coming soon →Health & Fitness Calculators
General wellness, fitness estimates, hydration, BMI-style tools, calorie estimates, and activity calculators.
Coming soon →Science Calculators
Physics, chemistry, energy, force, density, electricity, waves, and technical reference calculators.
Coming soon →Tech Calculators
Subnetting, storage, bandwidth, uptime, transfer time, server sizing, and IT planning calculators.
Open subnet calculator →Planned calculators
Next calculators to build
These are useful additions for search traffic, repeat visitors, and practical everyday use.
Planned
Loan Payment Calculator
Estimate monthly loan payments using loan amount, interest rate, and loan term.
Planned
Profit Margin Calculator
Calculate margin, markup, cost, selling price, gross profit, and business pricing targets.
Planned
Time Savings Calculator
Estimate how much time is saved by automation, templates, scripts, or process improvements.
Planned
Bandwidth Transfer Time Calculator
Estimate how long it takes to transfer files based on file size and network speed.
Need another calculator?
Suggest the next calculator.
If there is a math, business, finance, construction, tech, date, or planning calculator you want added to UtilTrove, send the idea through the suggestion page.