Free Calculators for Tax, Finance & GPA
Tax, payroll, GPA, protein, and conversion tools with clearer guide paths and updated 2026 assumptions.
236 Free Calculators
Updated for 2026
No Sign-up Required
What You Can Calculate
CalculatorWallah brings together free online calculators for tax planning, GPA tracking, health metrics, personal finance, and everyday math in one place. Use these tools to estimate take-home pay, check BMI, calculate GPA, compare loan payments, and solve quick conversions without downloading anything. Every calculator is free to use, mobile-friendly, and built to return clear results fast.
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.
VAT Calculator
Add VAT, remove VAT, reverse VAT, and compare UAE, UK, EU, GST, and custom rates.
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.
CAGR Calculator
Calculate annualized return from beginning value, ending value, and time.
Net Worth Calculator
Track assets, liabilities, and personal balance-sheet strength in one place.
Debt Payoff Calculator
Compare snowball and avalanche strategies with a month-by-month payoff plan.
Rent vs. Buy Calculator
Compare renting and buying with equity, break-even timing, and opportunity cost.
Inflation Calculator
Measure historical purchasing power and future inflation erosion with CPI context.
Discount Calculator
Calculate percent off, reverse discount, stacked deals, and checkout totals quickly.
BMI Calculator
Calculate BMI category and healthy-weight range estimates quickly.
Ideal Weight Calculator
Compare ideal body weight formulas and healthy target ranges by height.
Time & Hours Calculator
Calculate shift duration, weekly totals, timesheets, and overtime in one suite.
Time Zone Converter
Convert date and time across global zones with DST-aware comparison cards and live world clock context.
Math Equation Solver
Solve algebra equations online with step-by-step transformations, simplified form, and graph preview.
Fraction Calculator
Add, subtract, multiply, divide, simplify, and convert mixed numbers with exact step-by-step fraction logic.
Scientific Calculator
Evaluate advanced expressions with trigonometry, logarithms, powers, roots, and memory functions.
Pythagorean Theorem Calculator
Solve right triangles by finding a, b, or c with guided steps, a diagram, and exact-radical support.
Statistics Calculator
Analyze datasets with mean, median, mode, variance, standard deviation, quartiles, percentiles, and histogram output.
Angle Converter
Convert degrees, radians, grads, arcminutes, turns, and related angle units with exact factors.
Numbers Converter
Convert binary, octal, decimal, hexadecimal, and bases 2 through 36 with exact integer logic.
Guides That Explain The Calculators
Use the guide layer when you need context, assumptions, and next-step decisions, not just a one-page output.
Payroll & Take-Home Pay Guide
Learn the difference between paycheck, net pay, net salary, payroll deductions, and payslip workflows so you can choose the right compensation calculator first.
Income Tax Guide: Federal & State
Learn how federal, state, refund, and effective-rate questions fit together so you can choose the right tax calculator before trusting one estimate.
Sales Tax Guide: Rates & Rules
Understand how sales tax really works, including state rates, local add-ons, sourcing logic, category differences, and how to use state calculators correctly.
GPA Guide: Meaning, Formula & Scale
Understand GPA meaning, GPA formulas, GPA scales, CGPA, weighted vs unweighted GPA, GPA to percentage conversion, and what a good GPA means in real academic contexts.
GPA to Percentage Conversion Guide
Learn when GPA-to-percentage conversion is useful, why conversion rules vary, and how to use GPA, CGPA, and percentage tools without overclaiming precision.
Daily Protein Intake Guide
Learn how to estimate daily protein needs using body weight, activity, age, and goal context, then choose the right protein calculator for planning.
Protein Planning Guide: Goals & Stages
Choose the right protein calculator for muscle gain, fat loss, sport, plant-based diets, recovery, pregnancy, older age, and other specialized protein-planning contexts.
Unit Conversion Guide: Metric & Imperial
Learn when to use the all-in-one unit converter versus dedicated pair pages, and how to keep measurement context straight across metric and imperial systems.
Start With A Priority Cluster, Not A Random Tool
The strongest parts of CalculatorWallah are the clusters where the hub page, guide layer, and calculator page work together. Start with the cluster below if you want a clearer path from question to explanation to result.
Finance & Payroll
Use the financial hub when the real question is paycheck estimation, net salary, payroll deductions, or payslip logic instead of a generic money tool.
Tax Planning
Use the tax hub when the real question is federal, state, refund, FICA, or self-employment tax instead of generic payroll math or sales tax.
Sales Tax
Use the sales-tax hub when you need state-level tools backed by guide coverage for nexus, taxability, and rate interpretation.
Education & GPA
Start with the education cluster for GPA planning, transcript conversion, and academic target-setting instead of bouncing across overlapping student tools.
Protein & Nutrition
The health cluster is strongest around protein and nutrition planning, with guide support for choosing the right formula before using the calculator.
Conversion & Units
Use the conversion cluster when the real job is switching units accurately, choosing the right pair page, or checking precision and rounding.
Why The Homepage Now Points To Trust Pages
The homepage is meant to route users into the strongest clusters first, then expose who owns the methodology, how pages are reviewed, and where the source policy lives. That makes the site easier to trust and easier to navigate.
Reviewed By
Jitendra Kumar, Founder & Editorial Standards Lead, oversees methodology standards and trust-sensitive publishing decisions.
Review editor profileTopic Ownership
Sales tax, education, health, finance, and platform-wide calculator methodology.
See ownership standardsMethodology & Updates
Trust-critical pages are reviewed when official rates or rules change. Evergreen calculator guides are checked on a recurring quarterly or annual cycle depending on topic volatility.
Tax Calculators
Federal, payroll, VAT, 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.
VAT Calculator
Add, remove, and reverse VAT with country presets and bulk invoice support.
Financial Calculators
Cash-flow, business-pricing, 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.
Salary Calculator
Convert salary periods and estimate tax-adjusted net take-home pay in one workflow.
Mortgage Calculator
Monthly payment + amortization summary.
Loan & EMI Calculator Suite
Calculate EMI, amortization schedule, and prepayment impact across home, car, and personal loans.
Compound Interest Calculator
Future-value growth with contributions.
CAGR Calculator
Annualized return analysis from beginning value, ending value, and years.
Inflation Calculator
Historical purchasing power and future inflation-erosion modeling with CPI context.
Net Worth Calculator
Balance-sheet snapshot with categorized assets, liabilities, and charts.
Debt Payoff Calculator
Compare debt snowball and avalanche with payoff milestones and interest savings.
Rent vs. Buy Calculator
Compare renting and buying with opportunity cost, equity build-up, and break-even analysis.
Depreciation Calculator
Compare straight-line, DDB, SYD, and MACRS depreciation with year-by-year schedules and tax-focused first-year deductions.
Markup / Profit Margin Calculator
Calculate markup, margin, gross profit, discount impact, and pricing-table scenarios for product and service businesses.
Discount Calculator
Calculate sale price, percent off, reverse discount, stacked coupons, and tax-after-discount totals.
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.
Ideal Weight Calculator
Compare ideal-weight formulas, frame-size adjustment, and BMI range.
Calorie Calculator
Estimate maintenance, cut, and gain calorie targets.
Protein Calculator
Calculate daily protein targets by activity and fitness goal.
Protein by Body Weight Calculator
Compare evidence-based protein formulas by body weight in g/kg and g/lb with meal-planning context.
Female-Specific Protein Calculator
Women-focused protein planner with phase-aware notes, pregnancy/lactation context, and iron-rich food guidance.
Vegan / Vegetarian Protein Calculator
Plant-based protein planner with amino-acid adequacy scoring, restriction-aware food filters, and meal guidance.
Muscle Gain Protein Calculator
Estimate hypertrophy protein targets with meal-level and calorie-aware planning.
Weight Loss Protein Calculator
Estimate fat-loss protein targets, deficit pace, and muscle-preservation planning.
Macro Ratio Calculator
Convert daily calories into protein-carb-fat grams with diet presets, meal splits, and comparison planning.
TDEE & Macro Calculator
Calculate BMR, TDEE, target calories, and protein-carb-fat macro grams.
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.
Social Media Calculators
Creator-performance and campaign-analysis tools for engagement benchmarking.
Fun Calculators
Playful, shareable entertainment tools built for quick comparisons and repeat runs.
FLAMES Love Calculator
Play the classic FLAMES game with a deterministic relationship result, optional percentage, and shareable reveal card.
Soulmate Calculator
Check name, birth-date, combined, or numerology-inspired soulmate matching with a deterministic score and shareable card.
Astrology Compatibility Calculator
Compare zodiac signs, elements, and optional Moon/Rising layers with a deterministic match score and detailed reading.
Love Calculator
Estimate a playful name-based love percentage with a deterministic score, themed visuals, and a shareable card.
Zodiac Sign Compatibility Calculator
Compare two zodiac signs for love, friendship, communication, or teamwork with a deterministic score and shareable match card.
Birth Date Compatibility Calculator
Compare two birthdays with a deterministic compatibility score, date-pattern breakdown, and a shareable result card.
Birth Chart / Synastry Calculator
Compare two birth-chart-style profiles for a deterministic synastry score, big-three summary, and share-ready report card.
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
Descriptive statistics and study-design planning tools for data analysis, 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 measurement tools for area, perimeter, volume, speed, and weight or mass conversion.
Conversion Calculators
All-in-one conversion tools for metric, imperial, currency, and time-zone workflows.
Time Zone Converter
Convert date and time across global zones with DST-aware results, multi-zone comparison, and live world clock context.
CM to Feet Converter
Convert centimeters to feet, feet to centimeters, and height-style values into feet and inches with exact formulas and quick tables.
CM to KM Converter
Convert centimeters to kilometers, kilometers to centimeters, and metric chart references with exact formulas and quick tables.
CM to M Converter
Convert centimeters to meters, meters to centimeters, and related metric helper values with exact formulas and quick tables.
Feet to Miles Converter
Convert feet to miles, miles to feet, and nautical-mile references with exact formulas and quick tables.
Inches to Feet Converter
Convert inches to feet, feet to inches, and human-height values into feet and inches with exact formulas and quick tables.
Inches to Meters Converter
Convert inches to meters, meters to inches, and related centimeter or feet values with exact formulas and quick tables.
Inches to Yards Converter
Convert inches to yards, yards to inches, and related feet values with exact formulas and quick tables.
KM to Miles Converter
Convert kilometers to miles, miles to kilometers, and route-distance references with exact formulas and quick tables.
KM to M Converter
Convert kilometers to meters, meters to kilometers, and metric chart references with exact formulas and quick tables.
Meters to Feet Converter
Convert meters to feet, feet to meters, and human-height values into feet and inches with exact formulas and quick tables.
Meters to Miles Converter
Convert meters to miles, miles to meters, and running or travel distance references with exact formulas and quick tables.
Meters to Yards Converter
Convert meters to yards, yards to meters, and related feet, inch, or centimeter values with exact formulas and quick tables.
MM to CM Converter
Convert millimeters to centimeters, centimeters to millimeters, and classroom-friendly metric references with exact formulas and quick tables.
MM to Feet Converter
Convert millimeters to feet, feet to millimeters, and practical feet-and-inches values with exact formulas and quick tables.
MM to M Converter
Convert millimeters to meters, meters to millimeters, and related centimeter or inch values with exact formulas and quick tables.
MM to Inches Converter
Convert millimeters to inches, inches to millimeters, and common fraction-based inch inputs with workshop-friendly output.
CM to Inches Converter
Convert centimeters to inches, inches to centimeters, and human-height values into feet and inches.
Unit Converter Suite
Convert length, weight, volume, area, and temperature with formulas, steps, and precision control.
Temperature Converter
Scientific temperature conversion between Celsius, Fahrenheit, Kelvin, and optional Rankine.
Yards to Feet Converter
Convert yards to feet, feet to yards, and related inch or meter values with exact formulas and quick tables.
Yards to Miles Converter
Convert yards to miles, miles to yards, and related feet or meter values with exact formulas and quick tables.
Time Calculators
Duration, scheduling, global time-zone, and work-hours tools for payroll and planning workflows.
Time Zone Converter
Convert local date and time across cities with DST-aware output, multi-zone comparison, and meeting-planner cues.
Time & Hours Calculator
Calculate time differences, timesheets, weekly totals, and overtime accurately.
Date Duration Calculator
Measure date intervals and business-day windows for schedule planning.
Math Calculators
Advanced math tools for fractions, right-triangle solving, statistics, number conversion, angle conversion, trigonometry, logarithms, exponents, roots, and nested expression workflows.
Math Equation Solver
Interactive algebra solver for linear, quadratic, and polynomial equations with clear step-by-step output.
Fraction Calculator
Exact fraction arithmetic with mixed numbers, simplification, visual bars, and step-by-step solutions.
Scientific Calculator
Full-featured digital scientific calculator with DEG/RAD mode, memory controls, and history.
Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg with step-by-step right-triangle solving and a live diagram.
Statistics Calculator
Analyze datasets with mean, median, mode, variance, standard deviation, quartiles, and histogram output.
Angle Converter
Convert degrees, radians, grads, turns, and geometric angle units with exact factors and visual help.
Numbers Converter
Convert binary, octal, decimal, hexadecimal, and bases 2 through 36 with programmer-friendly formatting.
Percentage Calculator
Solve percent-of, percent change, and reverse percentage quickly.
Automotive Calculators
Vehicle-focused fuel economy, tire, and gearing tools for speedometer interpretation, trip planning, and practical fitment guidance.
Fuel Consumption Converter
Convert MPG (US/UK), km/L, L/100km, and gallon-based efficiency units with exact factors and trip-friendly comparison notes.
Tire Size, Gear Ratio & Speed/Odometer Calculator
Compare stock and new tire size, estimate speedometer error, and model gearing or RPM changes with fitment notes.
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.