Free Online Calculators for Finance, Health, Home & More
Access 52+ free calculators for retirement planning, construction projects, personal finance, statistics, health tracking, and everyday calculations.
Finance Calculators
12Plan retirement savings, estimate investment growth, compare paycheck outcomes, calculate interest, and evaluate personal finance decisions.
Health Calculators
8Track body metrics, wellness estimates, glucose conversions, blood alcohol estimates, pressure readings, and movement goals.
Home Improvement Calculators
12Estimate materials, dimensions, costs, and project quantities for flooring, concrete, roofing, fencing, lawns, pools, siding, and drywall.
Math Calculators
7Solve percentages, ratios, proportions, regression, distributions, differential equations, area, volume, and number conversions.
Electrical Calculators
1Check electrical planning estimates for conduit fill and wire layout decisions before reviewing code tables and project requirements.
Statistics Calculators
2Calculate regression, probability distributions, p-values, residuals, confidence intervals, prediction intervals, and related statistical checks.
Finance Calculators
Retirement, debt payoff, savings, investing, and cash-flow planning.
401k Calculator
Project 401k growth with employer match, then simulate retirement withdrawals over time.
Coast FIRE
See when your portfolio can coast to retirement on its own.
FERS Retirement
Check when you can retire, estimate your FERS pension and supplement, and project TSP growth.
Mortgage Payoff
Measure payoff date, interest saved, and extra payment scenarios.
Dave Ramsey Retirement
Project your retirement nest egg using Ramsey's 15% rule, 8% withdrawal rate, and Baby Step 4 principles. Includes pension, Social Security, employer match, and couples mode.
Cap Rate
Estimate cap rate, NOI, property value, and cash-on-cash return for rental and commercial deals.
Interest Only
Estimate IO payments, post-IO payments, and cost deltas for mortgages, HELOCs, loans, and construction draws.
Reverse Mortgage
Estimate reverse mortgage payout options, principal limit, and a 20-year equity projection without sharing personal info.
SCHD Dividend
Estimate SCHD dividend income by shares or investment, with after-tax and DRIP projections.
CD Calculator
Estimate CD maturity value, interest earned, and maturity date from APY, term, and start date.
Money Market
Calculate money market returns with APY, monthly, daily, and 7-day yield rates. Compare scenarios, visualize growth, and plan your cash savings.
Illinois Paycheck
Estimate Illinois take-home pay after federal tax, Illinois withholding, FICA, bonus pay, overtime, and common deductions.
Ohio Paycheck
Estimate Ohio take-home pay after federal tax, Ohio withholding, school district tax, FICA, bonus pay, overtime, and common deductions for 2025 and 2026.
Virginia Paycheck
Estimate Virginia take-home pay after federal tax, Virginia withholding, FICA, bonus pay, overtime, VA-4 exemptions, and common deductions for 2025 and 2026.
Georgia Paycheck
Estimate Georgia take-home pay after federal tax, Georgia withholding, FICA, bonus pay, overtime, G-4 allowances, and common deductions for 2025 and 2026.
Decimal Hours
Convert HH:MM to decimal hours for payroll, timecards, and Excel.
Hourly to Salary
Convert hourly wage to annual salary with overtime, bonus, and pay-period breakdowns, or reverse from salary to hourly.
Roth Conversion
Estimate tax impact of converting Traditional IRA to Roth IRA with 2025/2026 brackets, pro-rata rule, and multi-year spread planner.
Gold Value Calculator
Calculate the value of gold by weight, karat purity, and current price with grams, troy ounces, tola, and multi-currency support.
Business Calculators
Margins, pricing, forecasting, ROI, and operating decision support.
Education Calculators
Grades, score targets, study planning, and classroom-oriented math.
Health Calculators
Body metrics, nutrition, dosage, pacing, and wellness tracking.
Blood Alcohol
Estimate blood alcohol content by weight, drink count, ABV, and hours since drinking started.
Waist-Hip Ratio
Compare waist and hip measurements with women and men screening bands using inches or cm, plus body shape, body fat, and NHS-style intent.
EtG Calculator
Estimate a urine EtG detection window by standard drinks, drinking pattern, elapsed time, and the cutoff your test uses.
A1C Calculator
Convert A1C to average glucose, estimate A1C from readings, and interpret ADA risk levels.
MAP Calculator
Calculate mean arterial pressure from systolic and diastolic blood pressure with mmHg or kPa and clinical reference notes.
Steps to Miles
Walking distance by steps, height, or exact stride.
Sobriety Calculator
Track days of sobriety, see recovery milestones, countdown to the next milestone, and estimate money saved since quitting.
Stone Weight Calculator
Convert between stone, pounds, and kilograms instantly. Enter any value to see all weight equivalents.
Home Calculators
Pool care, renovation math, utility estimates, and household planning.
Asphalt Calculator
Estimate asphalt or bitumen tons and cost from dimensions, direct area, thickness, waste, and metric or imperial units.
Conduit Fill Calculator
Check NEC 2026 conduit fill for mixed wire sizes, Southwire and Belden seed data, Cat6, Romex, charts, and Excel export.
Concrete Block
Estimate concrete blocks for walls, steps, and whole-house projects with openings, pallets, mortar, and cost.
Drywall Calculator
Estimate drywall sheets, studs, screws, joint compound, tape, corner bead, and room material cost.
Siding Calculator
Estimate siding squares, package counts, and cost for house takeoffs, gable ends, and direct square feet.
Square Feet Calculator
Calculate area in square feet for rectangles, triangles, circles, and trapezoids. Use feet and inches together, trace on a map, then estimate tile, flooring, concrete, or paint.
Fence Calculator
Estimate fence length, materials, and cost with map measuring, board-on-board, and editable regional pricing.
Sod Calculator
Estimate lawn area, sod pieces, pallet counts, and USD cost.
Paver Calculator
Estimate paver counts, spacing waste, packages, and patio materials.
Pool Salt
Estimate the salt a pool needs by volume, ppm, and brand range.
Roofing Calculator
Estimate roofing squares, material quantities, and cost for roof takeoffs.
Rafter Calculator
Calculate rafter length, bird's mouth cuts, cut angles in DMS, HAP, jack rafters, and lumber requirements for gable, shed, hip, and lean-to roofs.
Lifestyle Calculators
Personal rituals, symbolic systems, and daily life guidance calculators.
Math Calculators
Percentages, ratios, conversions, and general-purpose number work.
Cubic Feet
Calculate cubic feet from room dimensions, square feet plus depth, cylinders, logs, slabs, and metric or imperial inputs.
Percentage Calculator
Solve percentage questions, points, margins, and money cases.
Proportion Calculator
Solve a missing value in A:B = C:D with cross-multiplication steps and equivalence check.
Linear Regression
Calculate regression equation, slope, intercept, R², residuals, confidence intervals, prediction intervals, and detailed steps for simple and multiple linear regression.
Binomial Distribution
Calculate exact binomial probabilities, CDF tails, range probability, and exact A/B test p-values.
Differential Equation
Solve common ODEs with steps, initial conditions, general solutions, and graphs.
Media Calculators
Aspect ratios, dimensions, crops, layouts, and creative asset prep.
Sports Calculators
Performance stats, game metrics, season pacing, and training numbers.
Pets Calculators
Puppy weight estimation, growth tracking, and pet care planning.
About Calc Hub
Free calculators for everyday decisions.
Browser-based tools that run instantly — no sign-up, no accounts, and no background trackers. Built for practical, everyday use.
Finance
Retirement, debt payoff, savings, investing, paychecks
Health
Body metrics, blood alcohol, A1C, wellness
Home
Construction estimates, renovation math, pool care
Math
Percentages, regression, distributions, conversions
Sports
ERA, no-vig odds, performance stats
How the tools work
Instant
Inputs update results live as you type. No page reloads or server round-trips.
Private
Everything runs locally in your browser. Inputs stay on your device — nothing is sent to a server.
Exportable
Where relevant, tools include visual interactive charts, CSV exports, and detailed step-by-step formula math.
Frequently Asked Questions
Got questions? We've got answers.
Quick answers about accuracy, privacy, formulas, and professional use.
An online calculator is a browser-based tool that runs a formula or estimate from the inputs you provide. Calc Hub focuses on practical calculators for finance, health, home projects, math, and everyday planning.
Each calculator is built around documented formulas, assumptions, or reference tables. Results are estimates and should be checked before making financial, medical, tax, construction, or professional decisions.
Yes. The calculators are designed for modern mobile and desktop browsers, with responsive layouts and touch-friendly inputs where the tool needs them.
Most inputs run directly in your browser. Calc Hub does not require sign-up, and calculator inputs are not used to create accounts or sell personal profiles.
Calculator formulas are implemented in TypeScript and covered by focused tests when a formula has meaningful edge cases. Support pages explain important assumptions where relevant.
Yes. Calc Hub calculators are free to use and do not require a subscription or sign-up.
You can use the tools for quick estimates, planning, and education, but final professional decisions should be reviewed against authoritative sources or a qualified expert.
Tools are updated when formulas, tax years, source data, or user-requested improvements require a change.