Calculator directory
All TechVodka tools
Find the right decision tool quickly. Search by what you want to work out, or browse the 40 free calculators by category. Everything runs in your browser with no signup.
Technology planning tools
Understand app traffic, server capacity and hosting requirements with editable assumptions.
Energy calculators
Understand usage, bills, appliances, inverters, and battery backup.
EnergyElectricity Bill CalculatorEstimate your monthly electricity bill from consumption and tariff details.EnergyHome Energy Audit CalculatorBuild a ranked home appliance inventory to find monthly electricity use, cost contribution and practical savings opportunities.EnergyAppliance Running Cost CalculatorSee what an appliance may cost to run per day, month, and year.EnergyAppliance Upgrade Savings CalculatorCompare an existing and replacement appliance to estimate energy savings, payback and multiyear net savings.EnergyTime-of-Day Electricity Savings CalculatorCompare appliance schedules across explicit peak and off-peak windows, including schedules that cross midnight.EnergyAC Running Cost CalculatorEstimate the electricity use and running cost of an air conditioner.EnergyInverter Size CalculatorEstimate the inverter capacity needed for your essential home loads.EnergyBattery Backup CalculatorEstimate battery capacity for the backup duration your home needs.
Solar calculators
Estimate the right system, cost, subsidy, savings, and payback.
SolarRooftop Solar Feasibility CalculatorEstimate how many selected panels fit in usable roof area and the practical nameplate capacity by area.SolarSolar System Size CalculatorEstimate a suitable rooftop solar capacity from your electricity use.SolarMonthly Solar Generation CalculatorEstimate each month's solar generation and consumption shortfall from twelve user-entered peak-sun-hour assumptions.SolarOn-Grid vs Hybrid vs Off-Grid CalculatorCompare system costs, backup capability, grid dependence and long-term scenarios without assuming export eligibility.SolarSolar Cost CalculatorEstimate the installed cost range for a rooftop solar system.SolarSolar ROI CalculatorEstimate solar savings, payback period, and long-term return.SolarSolar Subsidy CalculatorCheck an indicative residential rooftop solar subsidy amount.
EV calculators
Compare charging costs, petrol alternatives, and solar charging.
EVEV Real-World Range CalculatorEstimate driving distance above a chosen reserve with editable efficiency, climate and driving adjustments.EVEV Charging Time & Charger SelectorEstimate charging energy and time while respecting both vehicle and charger power limits.EVEV Charging Cost CalculatorEstimate the cost to charge an electric car at home or publicly.EVHome vs Public EV Charging CalculatorCompare home, public AC and public DC charging costs while keeping battery energy separate from meter energy.EVEV vs Petrol CalculatorCompare indicative ownership and running costs for an EV and petrol car.EVSolar + EV CalculatorEstimate the solar capacity needed to support your EV charging.
Car calculators
Plan a car purchase: affordability, down payment, loan EMI, new vs used, ownership cost, resale, fuel and insurance.
CarsCar Affordability CalculatorEstimate an illustrative car price range from your take-home pay, expenses, EMIs, down payment and running costs, using budget rules you can edit.CarsCar Down Payment PlannerProject how much you can save for a car down payment by a target date, the gap to your goal and the loan and EMI that would remain.CarsCar Loan EMI CalculatorCalculate car loan EMI, total interest, total loan payments and cash outlay with a year-by-year reducing-balance schedule.CarsNew vs Used Car CalculatorCompare the estimated cost of owning a new car and a used car over the same period, including financing, fuel, insurance, maintenance and resale.CarsCar Total Cost of Ownership CalculatorEstimate the full cost of owning a car, with depreciation, loan interest, fuel, insurance, service, repairs and parking, plus annual, monthly and per-km cost.CarsCar Depreciation & Resale Value CalculatorProject an illustrative year-by-year resale value from your own market estimate or an editable depreciation rate, with sensitivity to faster or slower value loss.CarsFuel Trip Cost CalculatorEstimate fuel or charging used, trip cost, tolls and cost per person for petrol, diesel, CNG or electric cars with the correct units for each.CarsCar Insurance Cost EstimatorBuild a multiyear car insurance budget from editable planning assumptions and compare the real quotes you receive side by side.
Home calculators
Plan buying and running a home: affordability, rent vs buy, stamp duty, loans, prepayment, upkeep, renovation, water and energy.
HomeHome Affordability CalculatorEstimate an illustrative home budget, loan, EMI, upfront cash and remaining monthly cash flow from your household finances and editable planning limits.HomeRent vs Buy Home CalculatorCompare renting and buying over the same period with equal cash, including loan payments, purchase and selling costs, upkeep, rent growth and investing the difference.HomeStamp Duty & Registration Cost CalculatorEstimate stamp duty, registration and other purchase charges from the rates you confirm for your state, with guidance-value and fee-cap handling.HomeHome Loan EMI CalculatorCalculate home loan EMI, total interest and total payments with a year-by-year reducing-balance amortization schedule.HomeHome Loan Prepayment CalculatorSee how extra monthly payments or a one-time prepayment could cut interest and tenure, or lower your EMI, compared with your current loan.HomeHome Maintenance Cost CalculatorBudget monthly, yearly and multiyear home upkeep from society charges, utilities, property tax, repairs and replacement reserves you can see and edit.HomeHome Renovation Budget CalculatorBuild an itemised renovation estimate with materials, labour, charges, tax and contingency, compare it with your budget and see which scope is still unpriced.HomeWater Consumption CalculatorEstimate daily and monthly household water use by activity, compare it with your meter and test illustrative conservation scenarios.HomeRainwater Harvesting CalculatorEstimate theoretical and usable roof rainwater, month-by-month tank storage, overflow and how much of your demand it could cover.HomeHome Energy Savings PlannerCombine appliance upgrades and rooftop solar into one plan with baseline cost, savings by improvement, investment and payback, without double-counting overlaps.