Before you build
Building Budget Estimator
Instant construction-cost range from structure, use and area.
Mortgage Repayment Estimator
Monthly payment from price, rate and term.
Land Potential Analyzer
Buildable volume and rough cost from coverage & floor-area ratios.
Buying & tax
Brokerage Fee Calculator
The legal cap on a sale's brokerage fee.
Acquisition Tax Calculator
The one-time tax on acquiring property.
Property Holding Tax Calculator
The yearly fixed-asset & city-planning tax.
Operating & conversion
Guesthouse / Hotel Revenue Simulator
Revenue, yield and payback โ minpaku 180-night cap.
Area Unit Converter
Convert tsubo, mยฒ and tatami in one click.
About these tools
A free collection of calculators from Towa Construction to help with property and building decisions โ construction cost per tsubo, mortgages, acquisition and property tax, brokerage fees, guesthouse/hotel returns, and area-unit conversion. Each gives an instant estimate based on common Japanese standards (the Transaction Business Act, tax law, the Housing Master Plan, the minpaku law), with no sign-up.
Using them along your decision path
Each tool stands alone, but they work best in sequence. Start with the Land Potential Analyzer to see what you can build, the Budget Estimator for construction cost, and the Mortgage Estimator for the monthly payment. For a purchase, check the Brokerage Fee and Acquisition Tax for upfront costs and the Property Holding Tax for the yearly cost. Considering investment? The Revenue Simulator carries it through to yield and payback.
FAQ
Are they free?
Yes โ all free, with no sign-up.
How accurate are the figures?
They are estimates based on common standards; actual amounts vary with conditions. Contact us for a formal review.
* Every result is an estimate. Actual costs, taxes and returns vary with the property, conditions and changes in law. For exact figures or individual advice, contact Towa Construction or the relevant professional.