Free Online Calculators — Precise Results, Zero Cost
Tax calculators, financial tools, and everyday math — updated for 2026
135+ Free Calculators
Updated for 2026
No Sign-up Required
Featured Calculators
Popular tools used most often by CalculatorWallah visitors.
Federal Income Tax Calculator
Bracket-by-bracket federal estimate with effective and marginal rates.
FICA Tax Calculator
Social Security + Medicare breakdown including additional surtax logic.
Paycheck Calculator
Estimate gross-to-net paycheck with federal, state, and payroll taxes.
Mortgage Calculator
Monthly payment, amortization curve, and total interest cost.
Compound Interest Calculator
Project long-term growth from principal plus monthly contributions.
BMI Calculator
Calculate BMI category and healthy-weight range estimates quickly.
Tax Calculators
Federal, payroll, and state-focused estimators for better tax planning.
Federal Income Tax Calculator
Federal bracket-level estimate with deduction options.
FICA Tax Calculator
Payroll tax split for Social Security and Medicare.
Self Employment Tax Calculator
Estimate SE tax and quarterly payment targets.
Capital Gains Tax Calculator
Short-term vs long-term capital gains tax modeling.
Financial Calculators
Cash-flow, loan, and investing tools for daily money decisions.
Paycheck Calculator
Per-paycheck net pay estimate with annual breakdown.
Net Pay Calculator
Estimate take-home salary after taxes and optional deductions.
Net Salary Calculator
Estimate monthly and yearly take-home salary after tax deductions.
Payroll Calculator
Compare employee net salary and employer total payroll cost.
Payroll Deductions Calculator
Estimate payroll deductions and take-home salary in one view.
Salary Deduction Calculator
Estimate salary deductions and remaining net take-home pay quickly.
Salary Tax Breakdown Tool
See federal, state, payroll contribution, and deduction tax structure clearly.
Payslip Calculator
Calculate salary breakdown and generate printable payslips online.
Mortgage Calculator
Monthly payment + amortization summary.
Compound Interest Calculator
Future-value growth with contributions.
Salary to Hourly Calculator
Convert compensation across all major pay frequencies.
Health Calculators
Quick wellness metrics for awareness and progress tracking.
BMI Calculator
Body mass index and healthy range estimate.
Calorie Calculator
Estimate maintenance, cut, and gain calorie targets.
Body Fat Calculator
Estimate body-fat percentage, lean mass, and fat mass.
BMR Calculator
Estimate BMR, maintenance calories, and goal-based intake targets.
Bra & Bust Size + Fit Calculator
Estimate bra size, convert regions, and troubleshoot fit issues.
Education Calculators
GPA and grade-planning tools for student success workflows.
Universal GPA Calculator
Calculate weighted and unweighted GPA with credits and course rigor.
CGPA Calculator
Compute cumulative GPA across semesters with credit-weighted inputs.
GPA to Percentage Converter
Convert 4.0, 5.0, and 10-point GPA values into percentage equivalents.
Percentage to GPA Converter
Convert percentage scores into GPA values for common global scales.
Statistics Calculators
Study-design planning tools for sample size, statistical power, and assumptions.
Engineering Calculators
Practical engineering calculators for electrical sizing, conduit planning, HVAC airflow checks, and tank/pipe volume estimation.
Electrical Cable/Wire Size and Voltage Drop Calculator
Estimate wire size, AWG/mm2 conversion, and voltage-drop checks for AC/DC electrical runs.
Conduit and Wire Fill Calculator
Estimate conduit fill percentage, raceway sizing, and derating context for practical wiring runs.
Duct Size / Ductulator and CFM Calculator
Estimate duct size, airflow velocity, pressure drop, and round/rectangular conversion options.
Pipe / Tank Volume and Dimensions Calculator
Calculate tank, pipe, and pool capacity with partial-fill estimates and metric/imperial conversion outputs.
Measurement Calculators
Shape-aware room and lot measurement tools for area, perimeter, volume, and land-unit conversion.
Automotive Calculators
Vehicle-focused tire and gearing tools for speedometer/odometer interpretation and practical fitment planning.
Everyday Calculators
Fast utility tools for common daily math and date tasks.
Need A Specific Calculator?
Explore all calculator hubs to find tax, financial, health, and everyday tools. We keep expanding the library with verified methodologies and frequent updates.