Home / Tools / Cost, Tolerances & Reference / Engineering Interest Calculator
Cost, Tolerances & Reference

Engineering Interest Calculator

Compound interest for machine finance and lease comparison. Enter principal, annual rate, term and compounding frequency to get future value, total interest and the monthly payment.

Input Parameters

Results

Future Value—
Total Interest—
Monthly Payment—
Technical Sourcing Service

Let our engineers find the right factory for your specs. 100% Quality Guaranteed.

Request a Proposal →

Compound interest and future value formulas

Equipment financing, lease vs buy decisions, and investment analysis all use compound interest. This calculator gives engineers and shop owners the numbers needed to make data-driven capital equipment decisions.

Frequently asked questions

Should I lease or buy a CNC machine?

Leasing preserves cash flow and often includes maintenance. Buying builds equity and has tax advantages (depreciation). At 7% interest over 5 years, a $100k machine costs about $117k total. Leasing the same machine at $2k/month costs $120k over 5 years. The break-even depends on utilisation, tax situation, and residual value.

What ROI should I expect from a new CNC machine?

A well-utilised VMC should pay back in 18-36 months from increased productivity, reduced labour, and new work capability. Target 30-50% annual ROI on the machine purchase price. Below 20% ROI, consider whether the machine adds capability you cannot get otherwise before dismissing the investment.

What interest rate is typical for machine tool financing?

5-10% for established shops with good credit. 8-15% for startups or weaker credit. Manufacturer financing (Mazak, DMG MORI, Haas) often offers promotional rates (0-3%) on new machines. Equipment loans typically have 3-7 year terms with 10-20% down payment.

How to use this Engineering Interest Calculator

Enter the present value (investment amount), annual interest rate, and number of years. The calculator shows future value, total interest earned or paid, and an estimated monthly payment for loan scenarios. Use this to evaluate equipment financing offers and compare lease vs buy decisions.

Common mistakes to avoid

Related CNC calculators

Continue with closely related tools from the machining calculator library.

Browse all free CNC machining calculators. Explore our carbide tooling resources for engineers and machinists.

Need carbide tooling for this operation?

Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.

Before you buy: what the market actually charges

Before you commit to a spec, it helps to know what the market pays for it. These are real, publicly listed factory prices — not a quotation, and not a guess.

Carbide tooling for this calculation

We source the tool families below direct from vetted Chinese factories, matched to the material and tolerance you just worked out. Every batch ships with its material certificate and dimensional record.

Send your drawing for a 48-hour quotation → How our China sourcing works →

Global Engineering Directory

Explore more precision machining tools and calculators

Carrying the cost of a deposit? Our guide covers payment terms that protect you — release the balance against an inspection report, not against a promise.

Get the Carbide Tooling Reference — free PDF

We source carbide cutting tools from China for job shops. We do not own a factory, which is why we can quote your drawing against two or three plants that actually run your material.

Cutting formulas with the units worked through · Speed and feed starting points for all six ISO material groups · How to read a carbide grade past its ISO code. 12 pages.

Or send us a quote you already have — we will benchmark it free →