Free calculators by category.

Loan Payment Calculator

Monthly amortizing loan payment from principal, rate and term.

Mortgage Calculator

Monthly mortgage payment with total interest breakdown.

Simple Interest Calculator

Simple interest and total repayment over time.

Compound Interest Calculator

Future value with compound growth.

VAT Calculator

Add VAT to a net amount.

Discount Calculator

Sale price after percentage discount.

Percentage Calculator

Find X percent of a value.

Profit Margin Calculator

Selling margin percent from price and cost.

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Break-Even Calculator

Units needed to cover fixed costs.

ROI Calculator

Return on investment percent.

Employer Salary Cost Calculator

Total employer cost including employer contributions.

Hourly Rate Calculator

Billable hourly rate from monthly income.

Straight-Line Depreciation

Annual depreciation from asset cost and salvage value.

Cash Flow Gap Calculator

Working capital gap from receivables vs payables timing.

Unit Cost Calculator

Cost per unit from total cost and quantity.

Machine Time Calculator

Setup plus cycle time converted to machine cost.

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CNC Cycle Time Calculator

Total CNC seconds per batch including load/unload.

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Welding Cost Estimator

Material, labor and consumables for a weld job.

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Laser Cutting Time Check

Cut path, pierce and setup minutes for laser jobs.

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3D Print Cost Check

Material, machine and post-process cost for a print job.

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Sheet Metal Weight Calculator

Plate weight from dimensions, thickness and density.

Material Waste Calculator

Waste kg and percent from input vs good output.

Scrap Rate Calculator

Scrap rate percent from scrapped vs total units.

OEE Calculator

Overall equipment effectiveness from A × P × Q.

Machine Hour Rate Calculator

Fully loaded machine hourly rate.

Tool Life Cost Calculator

Tooling cost allocated per good part.

Cutting Speed Calculator

Surface speed Vc from diameter and RPM.

Feed Rate Calculator

Table feed from RPM, teeth and feed per tooth.

Tolerance Drift Calculator

Deviation from target dimension and percent drift.

Batch Yield Calculator

Process yield percent from input vs good output quantity.

kWh Cost Calculator

Electricity cost from consumption and tariff.

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Electricity Bill Calculator

Monthly bill from usage, rate and fixed charge.

Energy Consumption Check

kWh and cost from power, hours and days.

Carbon Footprint Quick Check

CO₂ from energy use and emission factor.

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Fuel Emission Calculator

CO₂ from fuel liters and emission factor.

Solar Panel Output Calculator

Energy output from system size, sun hours and efficiency.

Heat Loss Calculator

Steady-state heat loss in watts.

Boiler Efficiency Calculator

Combustion efficiency from useful vs fuel input energy.

Compressor Energy Cost

Running cost from compressor kW, hours and rate.

CBAM Exposure Quick Check

Carbon border cost exposure from emissions and carbon price.

Fuel Consumption Calculator

Trip fuel liters and cost from distance and economy.

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Fuel Cost Calculator

Same as fuel consumption — liters and total cost.

Desi Calculator

Volumetric weight (desi) from parcel dimensions.

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Volumetric Weight Calculator

Chargeable volumetric weight for freight.

Route Cost Calculator

Trip cost from fuel, driver time and tolls.

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Delivery Cost Calculator

Last-mile cost from distance and stop fees.

Freight Cost Calculator

Freight charge from weight rate and fixed fee.

Warehouse Storage Cost

Storage cost from pallets, daily rate and days.

Vehicle Depreciation Calculator

Annual vehicle depreciation straight-line.

Trip Budget Calculator

Total trip budget from fuel, lodging, food and extras.

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Fertilizer Dosage Calculator

Total fertilizer from field area and dosage rate.

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Seed Rate Calculator

Seed quantity from area and seeding rate.

Irrigation Cost Check

Pump energy plus water cost for irrigation.

Water Usage Calculator

Liters from flow rate and duration.

Feed Cost Estimator

Total feed cost including transport.

Milk Yield Check

Daily milk liters and revenue estimate.

Crop Yield Calculator

Harvest tonnage and revenue from yield per hectare.

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Recipe Cost Check

Portion cost from total ingredient spend.

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Food Cost Percentage

Menu food cost percent from ingredient cost and menu price.

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Portion Cost Calculator

Cost per serving from batch cost.

Rent vs Buy Comparison

Compare total rent paid vs home purchase reference.

Home Budget Calculator

Monthly expenses vs income and remaining balance.

Time Duration Calculator

Elapsed minutes between two clock times.

Age Calculator

Age in years from birth year.

Date Difference Calculator

Day count difference between two day numbers.

Shopping Budget Calculator

Total of up to five shopping line items.

Fuel Travel Calculator

Trip fuel and cost for personal travel.

Unit Price Calculator

Price per unit from total price and quantity.

Tip Calculator

Tip amount and total bill with tip percent.

Savings Goal Calculator

Months to reach a savings target.

Percentage Increase Calculator

Percent change from old value to new value.

Average Calculator

Arithmetic mean of up to five values.

Median Calculator

Median of up to five numeric values.

Standard Deviation Calculator

Population standard deviation for up to five values.

Ratio Calculator

Ratio a:b and simplified form.

Proportion Calculator

Solve x in a/b = c/x proportion.

Probability Calculator

Probability percent from favorable and total outcomes.

Sample Size Calculator

Finite population sample size from margin and confidence.

Z-Score Calculator

Standard score from value, mean and standard deviation.

Linear Regression Calculator

Least-squares line through three (x,y) points.

Length Converter

Convert length between mm, cm, m, km, inch, ft, yd and mile.

Weight Converter

Convert mass between g, kg, ton, oz and lb.

Area Converter

Convert area units including m², ft², acres and hectares.

Volume Converter

Convert volume between ml, L, m³, in³, ft³ and US gallons.

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin.